diff --git a/src/components/colorbar/draw.js b/src/components/colorbar/draw.js
index a908e953b47..95b9660b447 100644
--- a/src/components/colorbar/draw.js
+++ b/src/components/colorbar/draw.js
@@ -72,66 +72,102 @@ function draw(gd) {
 }
 
 function makeColorBarData(gd) {
+    var fullLayout = gd._fullLayout;
     var calcdata = gd.calcdata;
     var out = [];
 
+    // single out item
+    var opts;
+    // colorbar attr parent container
+    var cont;
+    // trace attr container
+    var trace;
+    // colorbar options
+    var cbOpt;
+
+    function initOpts(opts) {
+        return extendFlat(opts, {
+            // fillcolor can be a d3 scale, domain is z values, range is colors
+            // or leave it out for no fill,
+            // or set to a string constant for single-color fill
+            _fillcolor: null,
+            // line.color has the same options as fillcolor
+            _line: {color: null, width: null, dash: null},
+            // levels of lines to draw.
+            // note that this DOES NOT determine the extent of the bar
+            // that's given by the domain of fillcolor
+            // (or line.color if no fillcolor domain)
+            _levels: {start: null, end: null, size: null},
+            // separate fill levels (for example, heatmap coloring of a
+            // contour map) if this is omitted, fillcolors will be
+            // evaluated halfway between levels
+            _filllevels: null,
+            // for continuous colorscales: fill with a gradient instead of explicit levels
+            // value should be the colorscale [[0, c0], [v1, c1], ..., [1, cEnd]]
+            _fillgradient: null,
+            // when using a gradient, we need the data range specified separately
+            _zrange: null
+        });
+    }
+
+    function calcOpts() {
+        if(typeof cbOpt.calc === 'function') {
+            cbOpt.calc(gd, trace, opts);
+        } else {
+            opts._fillgradient = cont.reversescale ?
+                flipScale(cont.colorscale) :
+                cont.colorscale;
+            opts._zrange = [cont[cbOpt.min], cont[cbOpt.max]];
+        }
+    }
+
     for(var i = 0; i < calcdata.length; i++) {
         var cd = calcdata[i];
-        var trace = cd[0].trace;
+        trace = cd[0].trace;
         var moduleOpts = trace._module.colorbar;
 
         if(trace.visible === true && moduleOpts) {
-            var cbOpts = Array.isArray(moduleOpts) ? moduleOpts : [moduleOpts];
+            var allowsMultiplotCbs = Array.isArray(moduleOpts);
+            var cbOpts = allowsMultiplotCbs ? moduleOpts : [moduleOpts];
 
             for(var j = 0; j < cbOpts.length; j++) {
-                var cbOpt = cbOpts[j];
+                cbOpt = cbOpts[j];
                 var contName = cbOpt.container;
-                var cont = contName ? trace[contName] : trace;
+                cont = contName ? trace[contName] : trace;
 
                 if(cont && cont.showscale) {
-                    var opts = cont.colorbar;
-                    opts._id = 'cb' + trace.uid;
+                    opts = initOpts(cont.colorbar);
+                    opts._id = 'cb' + trace.uid + (allowsMultiplotCbs && contName ? '-' + contName : '');
                     opts._traceIndex = trace.index;
                     opts._propPrefix = (contName ? contName + '.' : '') + 'colorbar.';
-
-                    extendFlat(opts, {
-                        // fillcolor can be a d3 scale, domain is z values, range is colors
-                        // or leave it out for no fill,
-                        // or set to a string constant for single-color fill
-                        _fillcolor: null,
-                        // line.color has the same options as fillcolor
-                        _line: {color: null, width: null, dash: null},
-                        // levels of lines to draw.
-                        // note that this DOES NOT determine the extent of the bar
-                        // that's given by the domain of fillcolor
-                        // (or line.color if no fillcolor domain)
-                        _levels: {start: null, end: null, size: null},
-                        // separate fill levels (for example, heatmap coloring of a
-                        // contour map) if this is omitted, fillcolors will be
-                        // evaluated halfway between levels
-                        _filllevels: null,
-                        // for continuous colorscales: fill with a gradient instead of explicit levels
-                        // value should be the colorscale [[0, c0], [v1, c1], ..., [1, cEnd]]
-                        _fillgradient: null,
-                        // when using a gradient, we need the data range specified separately
-                        _zrange: null
-                    });
-
-                    if(typeof cbOpt.calc === 'function') {
-                        cbOpt.calc(gd, cd, opts);
-                    } else {
-                        opts._fillgradient = cont.reversescale ?
-                            flipScale(cont.colorscale) :
-                            cont.colorscale;
-                        opts._zrange = [cont[cbOpt.min], cont[cbOpt.max]];
-                    }
-
+                    calcOpts();
                     out.push(opts);
                 }
             }
         }
     }
 
+    for(var k in fullLayout._colorAxes) {
+        cont = fullLayout[k];
+
+        if(cont.showscale) {
+            var colorAxOpts = fullLayout._colorAxes[k];
+
+            opts = initOpts(cont.colorbar);
+            opts._id = 'cb' + k;
+            opts._propPrefix = k + '.colorbar.';
+
+            cbOpt = {min: 'cmin', max: 'cmax'};
+            if(colorAxOpts[0] !== 'heatmap') {
+                trace = colorAxOpts[1];
+                cbOpt.calc = trace._module.colorbar.calc;
+            }
+
+            calcOpts();
+            out.push(opts);
+        }
+    }
+
     return out;
 }
 
@@ -561,7 +597,11 @@ function makeEditable(g, opts, gd) {
                 var update = {};
                 update[opts._propPrefix + 'x'] = xf;
                 update[opts._propPrefix + 'y'] = yf;
-                Registry.call('_guiRestyle', gd, update, opts._traceIndex);
+                if(opts._traceIndex !== undefined) {
+                    Registry.call('_guiRestyle', gd, update, opts._traceIndex);
+                } else {
+                    Registry.call('_guiRelayout', gd, update);
+                }
             }
         }
     });
diff --git a/src/components/colorscale/attributes.js b/src/components/colorscale/attributes.js
index 014377c1c91..3df6baec2a5 100644
--- a/src/components/colorscale/attributes.js
+++ b/src/components/colorscale/attributes.js
@@ -8,6 +8,9 @@
 
 'use strict';
 
+var colorbarAttrs = require('../colorbar/attributes');
+var counterRegex = require('../../lib/regex').counter;
+
 var palettes = require('./scales.js').scales;
 var paletteStr = Object.keys(palettes);
 
@@ -240,6 +243,25 @@ module.exports = function colorScaleAttrs(context, opts) {
                 effectDesc
             ].join('')
         };
+
+        attrs.colorbar = colorbarAttrs;
+    }
+
+    if(!opts.noColorAxis) {
+        attrs.coloraxis = {
+            valType: 'subplotid',
+            role: 'info',
+            regex: counterRegex('coloraxis'),
+            dflt: null,
+            editType: 'calc',
+            description: [
+                'Sets a reference to a shared color axis.',
+                'References to these shared color axes are *coloraxis*, *coloraxis2*, *coloraxis3*, etc.',
+                'Settings for these shared color axes are set in the layout, under',
+                '`layout.coloraxis`, `layout.coloraxis2`, etc.',
+                'Note that multiple color scales can be linked to the same color axis.'
+            ].join(' ')
+        };
     }
 
     return attrs;
diff --git a/src/components/colorscale/calc.js b/src/components/colorscale/calc.js
index ed2491f9420..54911a76452 100644
--- a/src/components/colorscale/calc.js
+++ b/src/components/colorscale/calc.js
@@ -8,37 +8,50 @@
 
 'use strict';
 
+var isNumeric = require('fast-isnumeric');
+
 var Lib = require('../../lib');
+var extractOpts = require('./helpers').extractOpts;
 
 module.exports = function calc(gd, trace, opts) {
     var fullLayout = gd._fullLayout;
     var vals = opts.vals;
     var containerStr = opts.containerStr;
-    var cLetter = opts.cLetter;
 
     var container = containerStr ?
         Lib.nestedProperty(trace, containerStr).get() :
         trace;
 
-    var autoAttr = cLetter + 'auto';
-    var minAttr = cLetter + 'min';
-    var maxAttr = cLetter + 'max';
-    var midAttr = cLetter + 'mid';
-    var auto = container[autoAttr];
-    var min = container[minAttr];
-    var max = container[maxAttr];
-    var mid = container[midAttr];
-    var scl = container.colorscale;
+    var cOpts = extractOpts(container);
+    var auto = cOpts.auto !== false;
+    var min = cOpts.min;
+    var max = cOpts.max;
+    var mid = cOpts.mid;
+
+    var minVal = function() { return Lib.aggNums(Math.min, null, vals); };
+    var maxVal = function() { return Lib.aggNums(Math.max, null, vals); };
 
-    if(auto !== false || min === undefined) {
-        min = Lib.aggNums(Math.min, null, vals);
+    if(min === undefined) {
+        min = minVal();
+    } else if(auto) {
+        if(container._colorAx && isNumeric(min)) {
+            min = Math.min(min, minVal());
+        } else {
+            min = minVal();
+        }
     }
 
-    if(auto !== false || max === undefined) {
-        max = Lib.aggNums(Math.max, null, vals);
+    if(max === undefined) {
+        max = maxVal();
+    } else if(auto) {
+        if(container._colorAx && isNumeric(max)) {
+            max = Math.max(max, maxVal());
+        } else {
+            max = maxVal();
+        }
     }
 
-    if(auto !== false && mid !== undefined) {
+    if(auto && mid !== undefined) {
         if(max - mid > mid - min) {
             min = mid - (max - mid);
         } else if(max - mid < mid - min) {
@@ -51,14 +64,14 @@ module.exports = function calc(gd, trace, opts) {
         max += 0.5;
     }
 
-    container['_' + minAttr] = container[minAttr] = min;
-    container['_' + maxAttr] = container[maxAttr] = max;
+    cOpts._sync('min', min);
+    cOpts._sync('max', max);
 
-    if(container.autocolorscale) {
+    if(cOpts.autocolorscale) {
+        var scl;
         if(min * max < 0) scl = fullLayout.colorscale.diverging;
         else if(min >= 0) scl = fullLayout.colorscale.sequential;
         else scl = fullLayout.colorscale.sequentialminus;
-
-        container._colorscale = container.colorscale = scl;
+        cOpts._sync('colorscale', scl);
     }
 };
diff --git a/src/components/colorscale/cross_trace_defaults.js b/src/components/colorscale/cross_trace_defaults.js
index 5933b669166..706bb7ccfb7 100644
--- a/src/components/colorscale/cross_trace_defaults.js
+++ b/src/components/colorscale/cross_trace_defaults.js
@@ -10,8 +10,9 @@
 
 var Lib = require('../../lib');
 var hasColorscale = require('./helpers').hasColorscale;
+var extractOpts = require('./helpers').extractOpts;
 
-module.exports = function crossTraceDefaults(fullData) {
+module.exports = function crossTraceDefaults(fullData, fullLayout) {
     function replace(cont, k) {
         var val = cont['_' + k];
         if(val !== undefined) {
@@ -19,44 +20,46 @@ module.exports = function crossTraceDefaults(fullData) {
         }
     }
 
-    function relinkColorAtts(trace, cAttrs) {
-        var cont = cAttrs.container ?
-            Lib.nestedProperty(trace, cAttrs.container).get() :
-            trace;
+    function relinkColorAtts(outerCont, cbOpt) {
+        var cont = cbOpt.container ?
+            Lib.nestedProperty(outerCont, cbOpt.container).get() :
+            outerCont;
 
         if(cont) {
-            var isAuto = cont.zauto || cont.cauto;
-            var minAttr = cAttrs.min;
-            var maxAttr = cAttrs.max;
+            if(cont.coloraxis) {
+                // stash ref to color axis
+                cont._colorAx = fullLayout[cont.coloraxis];
+            } else {
+                var cOpts = extractOpts(cont);
+                var isAuto = cOpts.auto;
 
-            if(isAuto || cont[minAttr] === undefined) {
-                replace(cont, minAttr);
-            }
-            if(isAuto || cont[maxAttr] === undefined) {
-                replace(cont, maxAttr);
-            }
-            if(cont.autocolorscale) {
-                replace(cont, 'colorscale');
+                if(isAuto || cOpts.min === undefined) {
+                    replace(cont, cbOpt.min);
+                }
+                if(isAuto || cOpts.max === undefined) {
+                    replace(cont, cbOpt.max);
+                }
+                if(cOpts.autocolorscale) {
+                    replace(cont, 'colorscale');
+                }
             }
         }
     }
 
     for(var i = 0; i < fullData.length; i++) {
         var trace = fullData[i];
-        var colorbar = trace._module.colorbar;
+        var cbOpts = trace._module.colorbar;
 
-        if(colorbar) {
-            if(Array.isArray(colorbar)) {
-                for(var j = 0; j < colorbar.length; j++) {
-                    relinkColorAtts(trace, colorbar[j]);
+        if(cbOpts) {
+            if(Array.isArray(cbOpts)) {
+                for(var j = 0; j < cbOpts.length; j++) {
+                    relinkColorAtts(trace, cbOpts[j]);
                 }
             } else {
-                relinkColorAtts(trace, colorbar);
+                relinkColorAtts(trace, cbOpts);
             }
         }
 
-        // TODO could generalize _module.colorscale and use it here?
-
         if(hasColorscale(trace, 'marker.line')) {
             relinkColorAtts(trace, {
                 container: 'marker.line',
@@ -64,13 +67,9 @@ module.exports = function crossTraceDefaults(fullData) {
                 max: 'cmax'
             });
         }
+    }
 
-        if(hasColorscale(trace, 'line')) {
-            relinkColorAtts(trace, {
-                container: 'line',
-                min: 'cmin',
-                max: 'cmax'
-            });
-        }
+    for(var k in fullLayout._colorAxes) {
+        relinkColorAtts(fullLayout[k], {min: 'cmin', max: 'cmax'});
     }
 };
diff --git a/src/components/colorscale/defaults.js b/src/components/colorscale/defaults.js
index 20070edf750..0cb953129b5 100644
--- a/src/components/colorscale/defaults.js
+++ b/src/components/colorscale/defaults.js
@@ -15,20 +15,74 @@ var hasColorbar = require('../colorbar/has_colorbar');
 var colorbarDefaults = require('../colorbar/defaults');
 
 var isValidScale = require('./scales').isValid;
+var traceIs = require('../../registry').traceIs;
 
-function npMaybe(cont, prefix) {
+function npMaybe(parentCont, prefix) {
     var containerStr = prefix.slice(0, prefix.length - 1);
     return prefix ?
-        Lib.nestedProperty(cont, containerStr).get() || {} :
-        cont;
+        Lib.nestedProperty(parentCont, containerStr).get() || {} :
+        parentCont;
 }
 
-module.exports = function colorScaleDefaults(traceIn, traceOut, layout, coerce, opts) {
+/**
+ * Colorscale / colorbar default handler
+ *
+ * @param {object} parentContIn : user (input) parent container (e.g. trace or layout coloraxis object)
+ * @param {object} parentContOut : full parent container
+ * @param {object} layout : (full) layout object
+ * @param {fn} coerce : Lib.coerce wrapper
+ * @param {object} opts :
+ * - prefix {string} : attr string prefix to colorscale container from parent root
+ * - cLetter {string} : 'c or 'z' color letter
+ */
+module.exports = function colorScaleDefaults(parentContIn, parentContOut, layout, coerce, opts) {
     var prefix = opts.prefix;
     var cLetter = opts.cLetter;
-    var containerIn = npMaybe(traceIn, prefix);
-    var containerOut = npMaybe(traceOut, prefix);
-    var template = npMaybe(traceOut._template || {}, prefix) || {};
+    var inTrace = '_module' in parentContOut;
+    var containerIn = npMaybe(parentContIn, prefix);
+    var containerOut = npMaybe(parentContOut, prefix);
+    var template = npMaybe(parentContOut._template || {}, prefix) || {};
+
+    // colorScaleDefaults wrapper called if-ever we need to reset the colorscale
+    // attributes for containers that were linked to invalid color axes
+    var thisFn = function() {
+        delete parentContIn.coloraxis;
+        delete parentContOut.coloraxis;
+        return colorScaleDefaults(parentContIn, parentContOut, layout, coerce, opts);
+    };
+
+    if(inTrace) {
+        var colorAxes = layout._colorAxes || {};
+        var colorAx = coerce(prefix + 'coloraxis');
+
+        if(colorAx) {
+            var colorbarVisuals = (
+                traceIs(parentContOut, 'contour') &&
+                Lib.nestedProperty(parentContOut, 'contours.coloring').get()
+            ) || 'heatmap';
+
+            var stash = colorAxes[colorAx];
+
+            if(stash) {
+                stash[2].push(thisFn);
+
+                if(stash[0] !== colorbarVisuals) {
+                    stash[0] = false;
+                    Lib.warn([
+                        'Ignoring coloraxis:', colorAx, 'setting',
+                        'as it is linked to incompatible colorscales.'
+                    ].join(' '));
+                }
+            } else {
+                // stash:
+                // - colorbar visual 'type'
+                // - colorbar options to help in Colorbar.draw
+                // - list of colorScaleDefaults wrapper functions
+                colorAxes[colorAx] = [colorbarVisuals, parentContOut, [thisFn]];
+            }
+            return;
+        }
+    }
 
     var minIn = containerIn[cLetter + 'min'];
     var maxIn = containerIn[cLetter + 'max'];
@@ -58,7 +112,7 @@ module.exports = function colorScaleDefaults(traceIn, traceOut, layout, coerce,
         // handles both the trace case where the dflt is listed in attributes and
         // the marker case where the dflt is determined by hasColorbar
         var showScaleDflt;
-        if(prefix) showScaleDflt = hasColorbar(containerIn);
+        if(prefix && inTrace) showScaleDflt = hasColorbar(containerIn);
 
         var showScale = coerce(prefix + 'showscale', showScaleDflt);
         if(showScale) colorbarDefaults(containerIn, containerOut, layout);
diff --git a/src/components/colorscale/helpers.js b/src/components/colorscale/helpers.js
index 47c53f8fd56..73ca3994476 100644
--- a/src/components/colorscale/helpers.js
+++ b/src/components/colorscale/helpers.js
@@ -44,6 +44,67 @@ function hasColorscale(trace, containerStr) {
     );
 }
 
+var constantAttrs = ['showscale', 'autocolorscale', 'colorscale', 'reversescale', 'colorbar'];
+var letterAttrs = ['min', 'max', 'mid', 'auto'];
+
+/**
+ * Extract 'c' / 'z', trace / color axis colorscale options
+ *
+ * Note that it would be nice to replace all z* with c* equivalents in v2
+ *
+ * @param {object} cont : attribute container
+ * @return {object}:
+ *  - min: cmin or zmin
+ *  - max: cmax or zmax
+ *  - mid: cmid or zmid
+ *  - auto: cauto or zauto
+ *  - *scale: *scale attrs
+ *  - colorbar: colorbar
+ *  - _sync: function syncing attr and underscore dual (useful when calc'ing min/max)
+ */
+function extractOpts(cont) {
+    var colorAx = cont._colorAx;
+    var cont2 = colorAx ? colorAx : cont;
+    var out = {};
+    var cLetter;
+    var i, k;
+
+    for(i = 0; i < constantAttrs.length; i++) {
+        k = constantAttrs[i];
+        out[k] = cont2[k];
+    }
+
+    if(colorAx) {
+        cLetter = 'c';
+        for(i = 0; i < letterAttrs.length; i++) {
+            k = letterAttrs[i];
+            out[k] = cont2['c' + k];
+        }
+    } else {
+        var k2;
+        for(i = 0; i < letterAttrs.length; i++) {
+            k = letterAttrs[i];
+            k2 = 'c' + k;
+            if(k2 in cont2) {
+                out[k] = cont2[k2];
+                continue;
+            }
+            k2 = 'z' + k;
+            if(k2 in cont2) {
+                out[k] = cont2[k2];
+            }
+        }
+        cLetter = k2.charAt(0);
+    }
+
+    out._sync = function(k, v) {
+        var k2 = letterAttrs.indexOf(k) !== -1 ? cLetter + k : k;
+        cont2[k2] = cont2['_' + k2] = v;
+    };
+
+    return out;
+}
+
 /**
  * Extract colorscale into numeric domain and color range.
  *
@@ -52,24 +113,19 @@ function hasColorscale(trace, containerStr) {
  *  - cmin/zmin {number}
  *  - cmax/zmax {number}
  *  - reversescale {boolean}
- * @param {object} opts
- *  - cLetter {string} 'c' (for cmin/cmax) or 'z' (for zmin/zmax)
  *
  * @return {object}
  *  - domain {array}
  *  - range {array}
  */
-function extractScale(cont, opts) {
-    var cLetter = opts.cLetter;
-
-    var scl = cont.reversescale ?
-        flipScale(cont.colorscale) :
-        cont.colorscale;
+function extractScale(cont) {
+    var cOpts = extractOpts(cont);
+    var cmin = cOpts.min;
+    var cmax = cOpts.max;
 
-    // minimum color value (used to clamp scale)
-    var cmin = cont[cLetter + 'min'];
-    // maximum color value (used to clamp scale)
-    var cmax = cont[cLetter + 'max'];
+    var scl = cOpts.reversescale ?
+        flipScale(cOpts.colorscale) :
+        cOpts.colorscale;
 
     var N = scl.length;
     var domain = new Array(N);
@@ -81,10 +137,7 @@ function extractScale(cont, opts) {
         range[i] = si[1];
     }
 
-    return {
-        domain: domain,
-        range: range
-    };
+    return {domain: domain, range: range};
 }
 
 function flipScale(scl) {
@@ -160,6 +213,10 @@ function makeColorScaleFunc(specs, opts) {
     return sclFunc;
 }
 
+function makeColorScaleFuncFromTrace(trace, opts) {
+    return makeColorScaleFunc(extractScale(trace), opts);
+}
+
 function colorArray2rbga(colorArray) {
     var colorObj = {
         r: colorArray[0],
@@ -173,7 +230,9 @@ function colorArray2rbga(colorArray) {
 
 module.exports = {
     hasColorscale: hasColorscale,
+    extractOpts: extractOpts,
     extractScale: extractScale,
     flipScale: flipScale,
-    makeColorScaleFunc: makeColorScaleFunc
+    makeColorScaleFunc: makeColorScaleFunc,
+    makeColorScaleFuncFromTrace: makeColorScaleFuncFromTrace
 };
diff --git a/src/components/colorscale/index.js b/src/components/colorscale/index.js
index 224cc41de65..2976b51926b 100644
--- a/src/components/colorscale/index.js
+++ b/src/components/colorscale/index.js
@@ -32,7 +32,9 @@ module.exports = {
     isValidScale: scales.isValid,
 
     hasColorscale: helpers.hasColorscale,
-    flipScale: helpers.flipScale,
+    extractOpts: helpers.extractOpts,
     extractScale: helpers.extractScale,
-    makeColorScaleFunc: helpers.makeColorScaleFunc
+    flipScale: helpers.flipScale,
+    makeColorScaleFunc: helpers.makeColorScaleFunc,
+    makeColorScaleFuncFromTrace: helpers.makeColorScaleFuncFromTrace
 };
diff --git a/src/components/colorscale/layout_attributes.js b/src/components/colorscale/layout_attributes.js
index 75ec78007af..3612884c172 100644
--- a/src/components/colorscale/layout_attributes.js
+++ b/src/components/colorscale/layout_attributes.js
@@ -8,40 +8,63 @@
 
 'use strict';
 
+var extendFlat = require('../../lib/extend').extendFlat;
+
+var colorScaleAttrs = require('./attributes');
 var scales = require('./scales').scales;
 
 var msg = 'Note that `autocolorscale` must be true for this attribute to work.';
 
 module.exports = {
     editType: 'calc',
-    sequential: {
-        valType: 'colorscale',
-        dflt: scales.Reds,
-        role: 'style',
-        editType: 'calc',
-        description: [
-            'Sets the default sequential colorscale for positive values.',
-            msg
-        ].join(' ')
-    },
-    sequentialminus: {
-        valType: 'colorscale',
-        dflt: scales.Blues,
-        role: 'style',
+
+    colorscale: {
         editType: 'calc',
-        description: [
-            'Sets the default sequential colorscale for negative values.',
-            msg
-        ].join(' ')
+
+        sequential: {
+            valType: 'colorscale',
+            dflt: scales.Reds,
+            role: 'style',
+            editType: 'calc',
+            description: [
+                'Sets the default sequential colorscale for positive values.',
+                msg
+            ].join(' ')
+        },
+        sequentialminus: {
+            valType: 'colorscale',
+            dflt: scales.Blues,
+            role: 'style',
+            editType: 'calc',
+            description: [
+                'Sets the default sequential colorscale for negative values.',
+                msg
+            ].join(' ')
+        },
+        diverging: {
+            valType: 'colorscale',
+            dflt: scales.RdBu,
+            role: 'style',
+            editType: 'calc',
+            description: [
+                'Sets the default diverging colorscale.',
+                msg
+            ].join(' ')
+        }
     },
-    diverging: {
-        valType: 'colorscale',
-        dflt: scales.RdBu,
-        role: 'style',
+
+    coloraxis: extendFlat({
+        // not really a 'subplot' attribute container,
+        // but this is the flag we use to denote attributes that
+        // support yaxis, yaxis2, yaxis3, ... counters
+        _isSubplotObj: true,
         editType: 'calc',
         description: [
-            'Sets the default diverging colorscale.',
-            msg
+            ''
         ].join(' ')
-    }
+    }, colorScaleAttrs('', {
+        colorAttr: 'corresponding trace color array(s)',
+        noColorAxis: true,
+        showScaleDflt: true
+    }))
 };
diff --git a/src/components/colorscale/layout_defaults.js b/src/components/colorscale/layout_defaults.js
index b05d56895c0..744e575de83 100644
--- a/src/components/colorscale/layout_defaults.js
+++ b/src/components/colorscale/layout_defaults.js
@@ -9,17 +9,41 @@
 'use strict';
 
 var Lib = require('../../lib');
-var colorscaleAttrs = require('./layout_attributes');
 var Template = require('../../plot_api/plot_template');
 
+var colorScaleAttrs = require('./layout_attributes');
+var colorScaleDefaults = require('./defaults');
+
 module.exports = function supplyLayoutDefaults(layoutIn, layoutOut) {
-    var colorscaleIn = layoutIn.colorscale;
-    var colorscaleOut = Template.newContainer(layoutOut, 'colorscale');
     function coerce(attr, dflt) {
-        return Lib.coerce(colorscaleIn, colorscaleOut, colorscaleAttrs, attr, dflt);
+        return Lib.coerce(layoutIn, layoutOut, colorScaleAttrs, attr, dflt);
     }
 
-    coerce('sequential');
-    coerce('sequentialminus');
-    coerce('diverging');
+    coerce('colorscale.sequential');
+    coerce('colorscale.sequentialminus');
+    coerce('colorscale.diverging');
+
+    var colorAxes = layoutOut._colorAxes;
+    var colorAxIn, colorAxOut;
+
+    function coerceAx(attr, dflt) {
+        return Lib.coerce(colorAxIn, colorAxOut, colorScaleAttrs.coloraxis, attr, dflt);
+    }
+
+    for(var k in colorAxes) {
+        var stash = colorAxes[k];
+
+        if(stash[0]) {
+            colorAxIn = layoutIn[k] || {};
+            colorAxOut = Template.newContainer(layoutOut, k, 'coloraxis');
+            colorAxOut._name = k;
+            colorScaleDefaults(colorAxIn, colorAxOut, layoutOut, coerceAx, {prefix: '', cLetter: 'c'});
+        } else {
+            // re-coerce colorscale attributes w/o coloraxis
+            for(var i = 0; i < stash[2].length; i++) {
+                stash[2][i]();
+            }
+            delete layoutOut._colorAxes[k];
+        }
+    }
 };
diff --git a/src/components/drawing/index.js b/src/components/drawing/index.js
index 9e764d93562..de3f243d87c 100644
--- a/src/components/drawing/index.js
+++ b/src/components/drawing/index.js
@@ -638,13 +638,9 @@ drawing.tryColorscale = function(marker, prefix) {
     var cont = prefix ? Lib.nestedProperty(marker, prefix).get() : marker;
 
     if(cont) {
-        var scl = cont.colorscale;
         var colorArray = cont.color;
-
-        if(scl && Lib.isArrayOrTypedArray(colorArray)) {
-            return Colorscale.makeColorScaleFunc(
-                Colorscale.extractScale(cont, {cLetter: 'c'})
-            );
+        if((cont.colorscale || cont._colorAx) && Lib.isArrayOrTypedArray(colorArray)) {
+            return Colorscale.makeColorScaleFuncFromTrace(cont);
         }
     }
     return Lib.identity;
diff --git a/src/lib/gl_format_color.js b/src/lib/gl_format_color.js
index cfa7a587aa6..36cd70d5ba7 100644
--- a/src/lib/gl_format_color.js
+++ b/src/lib/gl_format_color.js
@@ -6,7 +6,6 @@
 * LICENSE file in the root directory of this source tree.
 */
 
-
 'use strict';
 
 var isNumeric = require('fast-isnumeric');
@@ -47,9 +46,7 @@ function formatColor(containerIn, opacityIn, len) {
     var sclFunc, getColor, getOpacity, colori, opacityi;
 
     if(containerIn.colorscale !== undefined) {
-        sclFunc = Colorscale.makeColorScaleFunc(
-            Colorscale.extractScale(containerIn, {cLetter: 'c'})
-        );
+        sclFunc = Colorscale.makeColorScaleFuncFromTrace(containerIn);
     } else {
         sclFunc = validateColor;
     }
@@ -81,9 +78,11 @@ function formatColor(containerIn, opacityIn, len) {
 function parseColorScale(cont, alpha) {
     if(alpha === undefined) alpha = 1;
 
-    var colorscale = cont.reversescale ?
-        Colorscale.flipScale(cont.colorscale) :
-        cont.colorscale;
+    var cOpts = Colorscale.extractOpts(cont);
+
+    var colorscale = cOpts.reversescale ?
+        Colorscale.flipScale(cOpts.colorscale) :
+        cOpts.colorscale;
 
     return colorscale.map(function(elem) {
         var index = elem[0];
diff --git a/src/plot_api/edit_types.js b/src/plot_api/edit_types.js
index 6f849283de0..73972c449c6 100644
--- a/src/plot_api/edit_types.js
+++ b/src/plot_api/edit_types.js
@@ -35,7 +35,7 @@ var layoutOpts = {
     extras: ['none'],
     flags: [
         'calc', 'plot', 'legend', 'ticks', 'axrange',
-        'layoutstyle', 'modebar', 'camera', 'arraydraw'
+        'layoutstyle', 'modebar', 'camera', 'arraydraw', 'colorbars'
     ],
     description: [
         'layout attributes should include an `editType` string matching this flaglist.',
@@ -49,7 +49,8 @@ var layoutOpts = {
         '*modebar* just updates the modebar.',
         '*camera* just updates the camera settings for gl3d scenes.',
         '*arraydraw* allows component arrays to invoke the redraw routines just for the',
-        'component(s) that changed.'
+        'component(s) that changed.',
+        '*colorbars* only redraws colorbars.'
     ].join(' ')
 };
 
diff --git a/src/plot_api/plot_api.js b/src/plot_api/plot_api.js
index 7476b40c727..070ba387819 100644
--- a/src/plot_api/plot_api.js
+++ b/src/plot_api/plot_api.js
@@ -1871,6 +1871,7 @@ function relayout(gd, astr, val) {
         if(flags.ticks) seq.push(subroutines.doTicksRelayout);
         if(flags.modebar) seq.push(subroutines.doModeBar);
         if(flags.camera) seq.push(subroutines.doCamera);
+        if(flags.colorbars) seq.push(subroutines.doColorBars);
 
         seq.push(emitAfterPlot);
     }
@@ -2382,7 +2383,7 @@ function update(gd, traceUpdate, layoutUpdate, _traces) {
         axRangeSupplyDefaultsByPass(gd, relayoutFlags, relayoutSpecs) || Plots.supplyDefaults(gd);
 
         if(restyleFlags.style) seq.push(subroutines.doTraceStyle);
-        if(restyleFlags.colorbars) seq.push(subroutines.doColorBars);
+        if(restyleFlags.colorbars || relayoutFlags.colorbars) seq.push(subroutines.doColorBars);
         if(relayoutFlags.legend) seq.push(subroutines.doLegend);
         if(relayoutFlags.layoutstyle) seq.push(subroutines.layoutStyles);
         if(relayoutFlags.axrange) addAxRangeSequence(seq, relayoutSpecs.rangesAltered);
@@ -2779,7 +2780,7 @@ exports.react = function(gd, data, layout, config) {
 
             seq.push(Plots.previousPromises);
             if(restyleFlags.style) seq.push(subroutines.doTraceStyle);
-            if(restyleFlags.colorbars) seq.push(subroutines.doColorBars);
+            if(restyleFlags.colorbars || relayoutFlags.colorbars) seq.push(subroutines.doColorBars);
             if(relayoutFlags.legend) seq.push(subroutines.doLegend);
             if(relayoutFlags.layoutstyle) seq.push(subroutines.layoutStyles);
             if(relayoutFlags.axrange) addAxRangeSequence(seq);
diff --git a/src/plot_api/plot_schema.js b/src/plot_api/plot_schema.js
index 5dbe3fb4774..516a79c0fcf 100644
--- a/src/plot_api/plot_schema.js
+++ b/src/plot_api/plot_schema.js
@@ -373,7 +373,9 @@ function layoutHeadAttr(fullLayout, head) {
      */
     for(key in Registry.componentsRegistry) {
         _module = Registry.componentsRegistry[key];
-        if(!_module.schema && (head === _module.name)) {
+        if(_module.name === 'colorscale' && head.indexOf('coloraxis') === 0) {
+            return _module.layoutAttributes[head];
+        } else if(!_module.schema && (head === _module.name)) {
             return _module.layoutAttributes;
         }
     }
@@ -544,24 +546,26 @@ function getLayoutAttributes() {
         var schema = _module.schema;
 
         if(schema && (schema.subplots || schema.layout)) {
-        /*
-         * Components with defined schema have already been merged in at register time
-         * but a few components define attributes that apply only to xaxis
-         * not yaxis (rangeselector, rangeslider) - delete from y schema.
-         * Note that the input attributes for xaxis/yaxis are the same object
-         * so it's not possible to only add them to xaxis from the start.
-         * If we ever have such asymmetry the other way, or anywhere else,
-         * we will need to extend both this code and mergeComponentAttrsToSubplot
-         * (which will not find yaxis only for example)
-         */
-
+            /*
+             * Components with defined schema have already been merged in at register time
+             * but a few components define attributes that apply only to xaxis
+             * not yaxis (rangeselector, rangeslider) - delete from y schema.
+             * Note that the input attributes for xaxis/yaxis are the same object
+             * so it's not possible to only add them to xaxis from the start.
+             * If we ever have such asymmetry the other way, or anywhere else,
+             * we will need to extend both this code and mergeComponentAttrsToSubplot
+             * (which will not find yaxis only for example)
+             */
             var subplots = schema.subplots;
             if(subplots && subplots.xaxis && !subplots.yaxis) {
-                for(var xkey in subplots.xaxis) delete layoutAttributes.yaxis[xkey];
+                for(var xkey in subplots.xaxis) {
+                    delete layoutAttributes.yaxis[xkey];
+                }
             }
+        } else if(_module.name === 'colorscale') {
+            extendDeepAll(layoutAttributes, _module.layoutAttributes);
         } else if(_module.layoutAttributes) {
-        // older style without schema need to be explicitly merged in now
-
+            // older style without schema need to be explicitly merged in now
             insertAttrs(layoutAttributes, _module.layoutAttributes, _module.name);
         }
     }
diff --git a/src/plots/layout_attributes.js b/src/plots/layout_attributes.js
index ac204dbe8c6..66b55d13da8 100644
--- a/src/plots/layout_attributes.js
+++ b/src/plots/layout_attributes.js
@@ -11,7 +11,6 @@
 var fontAttrs = require('./font_attributes');
 var animationAttrs = require('./animation_attributes');
 var colorAttrs = require('../components/color/attributes');
-var colorscaleAttrs = require('../components/colorscale/layout_attributes');
 var padAttrs = require('./pad_attributes');
 var extendFlat = require('../lib/extend').extendFlat;
 
@@ -292,7 +291,6 @@ module.exports = {
         editType: 'calc',
         description: 'Sets the default trace colors.'
     },
-    colorscale: colorscaleAttrs,
     datarevision: {
         valType: 'any',
         role: 'info',
diff --git a/src/plots/plots.js b/src/plots/plots.js
index de8951680ba..8a92a745911 100644
--- a/src/plots/plots.js
+++ b/src/plots/plots.js
@@ -390,6 +390,8 @@ plots.supplyDefaults = function(gd, opts) {
     newFullLayout._firstScatter = {};
     // for grouped bar/box/violin trace to share config across traces
     newFullLayout._alignmentOpts = {};
+    // track color axes referenced in the data
+    newFullLayout._colorAxes = {};
 
     // for traces to request a default rangeslider on their x axes
     // eg set `_requestRangeslider.x2 = true` for xaxis2
@@ -445,7 +447,6 @@ plots.supplyDefaults = function(gd, opts) {
     for(i = 0; i < crossTraceDefaultsFuncs.length; i++) {
         crossTraceDefaultsFuncs[i](newFullData, newFullLayout);
     }
-    Registry.getComponentMethod('colorscale', 'crossTraceDefaults')(newFullData, newFullLayout);
 
     // turn on flag to optimize large splom-only graphs
     // mostly by omitting SVG layers during Cartesian.drawFramework
@@ -485,6 +486,9 @@ plots.supplyDefaults = function(gd, opts) {
     // relink functions and _ attributes to promote consistency between plots
     relinkPrivateKeys(newFullLayout, oldFullLayout);
 
+    // colorscale crossTraceDefaults needs newFullLayout with relinked keys
+    Registry.getComponentMethod('colorscale', 'crossTraceDefaults')(newFullData, newFullLayout);
+
     // For persisting GUI-driven changes in layout
     // _preGUI and _tracePreGUI were already copied over in relinkPrivateKeys
     if(!newFullLayout._preGUI) newFullLayout._preGUI = {};
diff --git a/src/traces/bar/attributes.js b/src/traces/bar/attributes.js
index 5cf9003da59..b9c4526df62 100644
--- a/src/traces/bar/attributes.js
+++ b/src/traces/bar/attributes.js
@@ -10,8 +10,7 @@
 
 var scatterAttrs = require('../scatter/attributes');
 var hovertemplateAttrs = require('../../components/fx/hovertemplate_attributes');
-var colorAttributes = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 var fontAttrs = require('../../plots/font_attributes');
 var constants = require('./constants.js');
 
@@ -33,13 +32,12 @@ var markerLineWidth = extendFlat({},
 var markerLine = extendFlat({
     width: markerLineWidth,
     editType: 'calc'
-}, colorAttributes('marker.line'));
+}, colorScaleAttrs('marker.line'));
 
 var marker = extendFlat({
     line: markerLine,
     editType: 'calc'
-}, colorAttributes('marker'), {
-    colorbar: colorbarAttrs,
+}, colorScaleAttrs('marker'), {
     opacity: {
         valType: 'number',
         arrayOk: true,
diff --git a/src/traces/choropleth/attributes.js b/src/traces/choropleth/attributes.js
index 5e68b2b7f71..827f25d7dfa 100644
--- a/src/traces/choropleth/attributes.js
+++ b/src/traces/choropleth/attributes.js
@@ -10,8 +10,7 @@
 
 var hovertemplateAttrs = require('../../components/fx/hovertemplate_attributes');
 var scatterGeoAttrs = require('../scattergeo/attributes');
-var colorscaleAttrs = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 var plotAttrs = require('../../plots/attributes');
 
 var extendFlat = require('../../lib/extend').extendFlat;
@@ -80,9 +79,8 @@ module.exports = extendFlat({
     hovertemplate: hovertemplateAttrs(),
 },
 
-    colorscaleAttrs('', {
+    colorScaleAttrs('', {
         cLetter: 'z',
         editTypeOverride: 'calc'
-    }),
-    {colorbar: colorbarAttrs}
+    })
 );
diff --git a/src/traces/choropleth/style.js b/src/traces/choropleth/style.js
index 9da61ac1580..c87efa20954 100644
--- a/src/traces/choropleth/style.js
+++ b/src/traces/choropleth/style.js
@@ -24,9 +24,7 @@ function styleTrace(gd, calcTrace) {
     var marker = trace.marker || {};
     var markerLine = marker.line || {};
 
-    var sclFunc = Colorscale.makeColorScaleFunc(
-        Colorscale.extractScale(trace, {cLetter: 'z'})
-    );
+    var sclFunc = Colorscale.makeColorScaleFuncFromTrace(trace);
 
     locs.each(function(d) {
         d3.select(this)
diff --git a/src/traces/cone/attributes.js b/src/traces/cone/attributes.js
index 0df3c8d9964..a47c8dc8ee5 100644
--- a/src/traces/cone/attributes.js
+++ b/src/traces/cone/attributes.js
@@ -8,8 +8,7 @@
 
 'use strict';
 
-var colorscaleAttrs = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 var hovertemplateAttrs = require('../../components/fx/hovertemplate_attributes');
 var mesh3dAttrs = require('../mesh3d/attributes');
 var baseAttrs = require('../../plots/attributes');
@@ -170,13 +169,11 @@ var attrs = {
     hovertemplate: hovertemplateAttrs({editType: 'calc'}, {keys: ['norm']})
 };
 
-extendFlat(attrs, colorscaleAttrs('', {
+extendFlat(attrs, colorScaleAttrs('', {
     colorAttr: 'u/v/w norm',
     showScaleDflt: true,
     editTypeOverride: 'calc'
-}), {
-    colorbar: colorbarAttrs
-});
+}));
 
 var fromMesh3d = ['opacity', 'lightposition', 'lighting'];
 
diff --git a/src/traces/cone/convert.js b/src/traces/cone/convert.js
index dcdfcb9d5f1..740258a4998 100644
--- a/src/traces/cone/convert.js
+++ b/src/traces/cone/convert.js
@@ -13,6 +13,7 @@ var createConeMesh = require('gl-cone3d').createConeMesh;
 
 var simpleMap = require('../../lib').simpleMap;
 var parseColorScale = require('../../lib/gl_format_color').parseColorScale;
+var extractOpts = require('../../components/colorscale').extractOpts;
 var zip3 = require('../../plots/gl3d/zip3');
 
 function Cone(scene, uid) {
@@ -80,8 +81,9 @@ function convert(scene, trace) {
         trace._len
     );
 
+    var cOpts = extractOpts(trace);
     coneOpts.colormap = parseColorScale(trace);
-    coneOpts.vertexIntensityBounds = [trace.cmin / trace._normMax, trace.cmax / trace._normMax];
+    coneOpts.vertexIntensityBounds = [cOpts.min / trace._normMax, cOpts.max / trace._normMax];
     coneOpts.coneOffset = anchor2coneOffset[trace.anchor];
 
     if(trace.sizemode === 'scaled') {
diff --git a/src/traces/contour/attributes.js b/src/traces/contour/attributes.js
index 4e48ff14beb..4d2fef35fcc 100644
--- a/src/traces/contour/attributes.js
+++ b/src/traces/contour/attributes.js
@@ -10,8 +10,7 @@
 
 var heatmapAttrs = require('../heatmap/attributes');
 var scatterAttrs = require('../scatter/attributes');
-var colorscaleAttrs = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 var dash = require('../../components/drawing/attributes').dash;
 var fontAttrs = require('../../plots/font_attributes');
 var extendFlat = require('../../lib/extend').extendFlat;
@@ -251,10 +250,9 @@ module.exports = extendFlat({
         editType: 'plot'
     }
 },
-    colorscaleAttrs('', {
+    colorScaleAttrs('', {
         cLetter: 'z',
         autoColorDflt: false,
         editTypeOverride: 'calc'
-    }),
-    { colorbar: colorbarAttrs }
+    })
 );
diff --git a/src/traces/contour/calc.js b/src/traces/contour/calc.js
index 5f16e8f312c..7f764e22f2e 100644
--- a/src/traces/contour/calc.js
+++ b/src/traces/contour/calc.js
@@ -6,17 +6,46 @@
 * LICENSE file in the root directory of this source tree.
 */
 
-
 'use strict';
 
+var Colorscale = require('../../components/colorscale');
+
 var heatmapCalc = require('../heatmap/calc');
 var setContours = require('./set_contours');
+var endPlus = require('./end_plus');
 
 // most is the same as heatmap calc, then adjust it
 // though a few things inside heatmap calc still look for
 // contour maps, because the makeBoundArray calls are too entangled
 module.exports = function calc(gd, trace) {
     var cd = heatmapCalc(gd, trace);
-    setContours(trace);
+
+    var zOut = cd[0].z;
+    setContours(trace, zOut);
+
+    var contours = trace.contours;
+    var cOpts = Colorscale.extractOpts(trace);
+    var cVals;
+
+    if(contours.coloring === 'heatmap' && cOpts.auto && trace.autocontour === false) {
+        var start = contours.start;
+        var end = endPlus(contours);
+        var cs = contours.size || 1;
+        var nc = Math.floor((end - start) / cs) + 1;
+
+        if(!isFinite(cs)) {
+            cs = 1;
+            nc = 1;
+        }
+
+        var min0 = start - cs / 2;
+        var max0 = min0 + nc * cs;
+        cVals = [min0, max0];
+    } else {
+        cVals = zOut;
+    }
+
+    Colorscale.calc(gd, trace, {vals: cVals, cLetter: 'z'});
+
     return cd;
 };
diff --git a/src/traces/contour/colorbar.js b/src/traces/contour/colorbar.js
index 0dd7a58c0eb..46514b90a78 100644
--- a/src/traces/contour/colorbar.js
+++ b/src/traces/contour/colorbar.js
@@ -8,11 +8,11 @@
 
 'use strict';
 
+var extractOpts = require('../../components/colorscale').extractOpts;
 var makeColorMap = require('./make_color_map');
 var endPlus = require('./end_plus');
 
-function calc(gd, cd, opts) {
-    var trace = cd[0].trace;
+function calc(gd, trace, opts) {
     var contours = trace.contours;
     var line = trace.line;
     var cs = contours.size || 1;
@@ -20,8 +20,9 @@ function calc(gd, cd, opts) {
     var colorMap = makeColorMap(trace, {isColorbar: true});
 
     if(coloring === 'heatmap') {
+        var cOpts = extractOpts(trace);
         opts._fillgradient = trace.colorscale;
-        opts._zrange = [trace.zmin, trace.zmax];
+        opts._zrange = [cOpts.min, cOpts.max];
     } else if(coloring === 'fill') {
         opts._fillcolor = colorMap;
     }
diff --git a/src/traces/contour/make_color_map.js b/src/traces/contour/make_color_map.js
index 74c1ca90889..c739bf25500 100644
--- a/src/traces/contour/make_color_map.js
+++ b/src/traces/contour/make_color_map.js
@@ -6,10 +6,10 @@
 * LICENSE file in the root directory of this source tree.
 */
 
-
 'use strict';
 
 var d3 = require('d3');
+
 var Colorscale = require('../../components/colorscale');
 var endPlus = require('./end_plus');
 
@@ -20,15 +20,16 @@ module.exports = function makeColorMap(trace) {
     var cs = contours.size || 1;
     var nc = Math.floor((end - start) / cs) + 1;
     var extra = contours.coloring === 'lines' ? 0 : 1;
+    var cOpts = Colorscale.extractOpts(trace);
 
     if(!isFinite(cs)) {
         cs = 1;
         nc = 1;
     }
 
-    var scl = trace.reversescale ?
-        Colorscale.flipScale(trace.colorscale) :
-        trace.colorscale;
+    var scl = cOpts.reversescale ?
+        Colorscale.flipScale(cOpts.colorscale) :
+        cOpts.colorscale;
 
     var len = scl.length;
     var domain = new Array(len);
@@ -37,51 +38,45 @@ module.exports = function makeColorMap(trace) {
     var si, i;
 
     if(contours.coloring === 'heatmap') {
-        if(trace.zauto && trace.autocontour === false) {
-            trace.zmin = start - cs / 2;
-            trace.zmax = trace.zmin + nc * cs;
-        }
+        var zmin0 = cOpts.min;
+        var zmax0 = cOpts.max;
 
         for(i = 0; i < len; i++) {
             si = scl[i];
-
-            domain[i] = si[0] * (trace.zmax - trace.zmin) + trace.zmin;
+            domain[i] = si[0] * (zmax0 - zmin0) + zmin0;
             range[i] = si[1];
         }
 
         // do the contours extend beyond the colorscale?
         // if so, extend the colorscale with constants
         var zRange = d3.extent([
-            trace.zmin,
-            trace.zmax,
+            zmin0,
+            zmax0,
             contours.start,
             contours.start + cs * (nc - 1)
         ]);
-        var zmin = zRange[trace.zmin < trace.zmax ? 0 : 1];
-        var zmax = zRange[trace.zmin < trace.zmax ? 1 : 0];
+        var zmin = zRange[zmin0 < zmax0 ? 0 : 1];
+        var zmax = zRange[zmin0 < zmax0 ? 1 : 0];
 
-        if(zmin !== trace.zmin) {
+        if(zmin !== zmin0) {
             domain.splice(0, 0, zmin);
-            range.splice(0, 0, Range[0]);
+            range.splice(0, 0, range[0]);
         }
 
-        if(zmax !== trace.zmax) {
+        if(zmax !== zmax0) {
             domain.push(zmax);
             range.push(range[range.length - 1]);
         }
     } else {
         for(i = 0; i < len; i++) {
             si = scl[i];
-
             domain[i] = (si[0] * (nc + extra - 1) - (extra / 2)) * cs + start;
             range[i] = si[1];
         }
     }
 
-    return Colorscale.makeColorScaleFunc({
-        domain: domain,
-        range: range,
-    }, {
-        noNumericCheck: true
-    });
+    return Colorscale.makeColorScaleFunc(
+        {domain: domain, range: range},
+        {noNumericCheck: true}
+    );
 };
diff --git a/src/traces/contour/plot.js b/src/traces/contour/plot.js
index 0411e864695..201965f9765 100644
--- a/src/traces/contour/plot.js
+++ b/src/traces/contour/plot.js
@@ -43,12 +43,6 @@ exports.plot = function plot(gd, plotinfo, cdcontours, contourLayer) {
         var heatmapColoringLayer = Lib.ensureSingle(plotGroup, 'g', 'heatmapcoloring');
         var cdheatmaps = [];
         if(contours.coloring === 'heatmap') {
-            if(trace.zauto && (trace.autocontour === false)) {
-                trace._input.zmin = trace.zmin =
-                    contours.start - contours.size / 2;
-                trace._input.zmax = trace.zmax =
-                    trace.zmin + pathinfo.length * contours.size;
-            }
             cdheatmaps = [cd];
         }
         heatmapPlot(gd, plotinfo, cdheatmaps, heatmapColoringLayer);
diff --git a/src/traces/contour/set_contours.js b/src/traces/contour/set_contours.js
index 0804413a4a3..31d8f7f0f8b 100644
--- a/src/traces/contour/set_contours.js
+++ b/src/traces/contour/set_contours.js
@@ -6,28 +6,29 @@
 * LICENSE file in the root directory of this source tree.
 */
 
-
 'use strict';
 
 var Axes = require('../../plots/cartesian/axes');
 var Lib = require('../../lib');
 
-
-module.exports = function setContours(trace) {
+module.exports = function setContours(trace, vals) {
     var contours = trace.contours;
 
     // check if we need to auto-choose contour levels
     if(trace.autocontour) {
+        // N.B. do not try to use coloraxis cmin/cmax,
+        // these values here are meant to remain "per-trace" for now
         var zmin = trace.zmin;
         var zmax = trace.zmax;
-        if(zmin === undefined || zmax === undefined) {
-            zmin = Lib.aggNums(Math.min, null, trace._z);
-            zmax = Lib.aggNums(Math.max, null, trace._z);
+        if(trace.zauto || zmin === undefined) {
+            zmin = Lib.aggNums(Math.min, null, vals);
+        }
+        if(trace.zauto || zmax === undefined) {
+            zmax = Lib.aggNums(Math.max, null, vals);
         }
-        var dummyAx = autoContours(zmin, zmax, trace.ncontours);
 
+        var dummyAx = autoContours(zmin, zmax, trace.ncontours);
         contours.size = dummyAx.dtick;
-
         contours.start = Axes.tickFirst(dummyAx);
         dummyAx.range.reverse();
         contours.end = Axes.tickFirst(dummyAx);
diff --git a/src/traces/contourcarpet/attributes.js b/src/traces/contourcarpet/attributes.js
index 6bcec99d63f..d2d28b86aef 100644
--- a/src/traces/contourcarpet/attributes.js
+++ b/src/traces/contourcarpet/attributes.js
@@ -12,8 +12,7 @@ var heatmapAttrs = require('../heatmap/attributes');
 var contourAttrs = require('../contour/attributes');
 var contourContourAttrs = contourAttrs.contours;
 var scatterAttrs = require('../scatter/attributes');
-var colorscaleAttrs = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 
 var extendFlat = require('../../lib/extend').extendFlat;
 
@@ -95,9 +94,8 @@ module.exports = extendFlat({
     transforms: undefined
 },
 
-    colorscaleAttrs('', {
+    colorScaleAttrs('', {
         cLetter: 'z',
         autoColorDflt: false
-    }),
-    { colorbar: colorbarAttrs }
+    })
 );
diff --git a/src/traces/contourcarpet/calc.js b/src/traces/contourcarpet/calc.js
index 07d5919ab34..73f418dbccc 100644
--- a/src/traces/contourcarpet/calc.js
+++ b/src/traces/contourcarpet/calc.js
@@ -45,8 +45,7 @@ module.exports = function calc(gd, trace) {
     }
 
     var cd = heatmappishCalc(gd, trace);
-
-    setContours(trace);
+    setContours(trace, trace._z);
 
     return cd;
 };
diff --git a/src/traces/heatmap/attributes.js b/src/traces/heatmap/attributes.js
index 89cc79bf02c..4821fcbeb0f 100644
--- a/src/traces/heatmap/attributes.js
+++ b/src/traces/heatmap/attributes.js
@@ -10,8 +10,7 @@
 
 var scatterAttrs = require('../scatter/attributes');
 var hovertemplateAttrs = require('../../components/fx/hovertemplate_attributes');
-var colorscaleAttrs = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 
 var extendFlat = require('../../lib/extend').extendFlat;
 
@@ -121,9 +120,5 @@ module.exports = extendFlat({
 }, {
     transforms: undefined
 },
-    colorscaleAttrs('', {
-        cLetter: 'z',
-        autoColorDflt: false
-    }),
-    { colorbar: colorbarAttrs }
+    colorScaleAttrs('', {cLetter: 'z', autoColorDflt: false})
 );
diff --git a/src/traces/heatmap/calc.js b/src/traces/heatmap/calc.js
index f86bb23ed37..69633c278f3 100644
--- a/src/traces/heatmap/calc.js
+++ b/src/traces/heatmap/calc.js
@@ -142,13 +142,8 @@ module.exports = function calc(gd, trace) {
         cd0.pts = binned.pts;
     }
 
-    // auto-z and autocolorscale if applicable
-    if(!isContour || trace.contours.type !== 'constraint') {
-        colorscaleCalc(gd, trace, {
-            vals: z,
-            containerStr: '',
-            cLetter: 'z'
-        });
+    if(!isContour) {
+        colorscaleCalc(gd, trace, {vals: z, cLetter: 'z'});
     }
 
     if(isContour && trace.contours && trace.contours.coloring === 'heatmap') {
diff --git a/src/traces/heatmap/hover.js b/src/traces/heatmap/hover.js
index cfc2e72f0c2..55e9f63d195 100644
--- a/src/traces/heatmap/hover.js
+++ b/src/traces/heatmap/hover.js
@@ -6,12 +6,12 @@
 * LICENSE file in the root directory of this source tree.
 */
 
-
 'use strict';
 
 var Fx = require('../../components/fx');
 var Lib = require('../../lib');
 var Axes = require('../../plots/cartesian/axes');
+var extractOpts = require('../../components/colorscale').extractOpts;
 
 module.exports = function hoverPoints(pointData, xval, yval, hovermode, hoverLayer, contour) {
     var cd0 = pointData.cd[0];
@@ -24,7 +24,6 @@ module.exports = function hoverPoints(pointData, xval, yval, hovermode, hoverLay
     var xc = cd0.xCenter;
     var yc = cd0.yCenter;
     var zmask = cd0.zmask;
-    var range = [trace.zmin, trace.zmax];
     var zhoverformat = trace.zhoverformat;
     var x2 = x;
     var y2 = y;
@@ -95,17 +94,16 @@ module.exports = function hoverPoints(pointData, xval, yval, hovermode, hoverLay
         text = cd0.text[ny][nx];
     }
 
-    var zLabel;
     // dummy axis for formatting the z value
+    var cOpts = extractOpts(trace);
     var dummyAx = {
         type: 'linear',
-        range: range,
+        range: [cOpts.min, cOpts.max],
         hoverformat: zhoverformat,
         _separators: xa._separators,
         _numFormat: xa._numFormat
     };
-    var zLabelObj = Axes.tickText(dummyAx, zVal, 'hover');
-    zLabel = zLabelObj.text;
+    var zLabel = Axes.tickText(dummyAx, zVal, 'hover').text;
 
     return [Lib.extendFlat(pointData, {
         index: [ny, nx],
diff --git a/src/traces/heatmap/plot.js b/src/traces/heatmap/plot.js
index 190d56e2a4b..66259cfcf1c 100644
--- a/src/traces/heatmap/plot.js
+++ b/src/traces/heatmap/plot.js
@@ -14,7 +14,7 @@ var tinycolor = require('tinycolor2');
 
 var Registry = require('../../registry');
 var Lib = require('../../lib');
-var Colorscale = require('../../components/colorscale');
+var makeColorScaleFuncFromTrace = require('../../components/colorscale').makeColorScaleFuncFromTrace;
 var xmlnsNamespaces = require('../../constants/xmlns_namespaces');
 
 module.exports = function(gd, plotinfo, cdheatmaps, heatmapLayer) {
@@ -140,10 +140,7 @@ module.exports = function(gd, plotinfo, cdheatmaps, heatmapLayer) {
         canvas.height = canvasH;
         var context = canvas.getContext('2d');
 
-        var sclFunc = Colorscale.makeColorScaleFunc(
-            Colorscale.extractScale(trace, {cLetter: 'z'}),
-            { noNumericCheck: true, returnArray: true }
-        );
+        var sclFunc = makeColorScaleFuncFromTrace(trace, {noNumericCheck: true, returnArray: true});
 
         // map brick boundaries to image pixels
         var xpx,
diff --git a/src/traces/heatmapgl/attributes.js b/src/traces/heatmapgl/attributes.js
index 081fb12499b..8769247f0d3 100644
--- a/src/traces/heatmapgl/attributes.js
+++ b/src/traces/heatmapgl/attributes.js
@@ -8,15 +8,12 @@
 
 'use strict';
 
-
 var heatmapAttrs = require('../heatmap/attributes');
-var colorscaleAttrs = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 
 var extendFlat = require('../../lib/extend').extendFlat;
 var overrideAll = require('../../plot_api/edit_types').overrideAll;
 
-
 var commonList = [
     'z',
     'x', 'x0', 'dx',
@@ -34,8 +31,7 @@ for(var i = 0; i < commonList.length; i++) {
 
 extendFlat(
     attrs,
-    colorscaleAttrs('', {cLetter: 'z', autoColorDflt: false}),
-    {colorbar: colorbarAttrs}
+    colorScaleAttrs('', {cLetter: 'z', autoColorDflt: false})
 );
 
 module.exports = overrideAll(attrs, 'calc', 'nested');
diff --git a/src/traces/histogram2d/attributes.js b/src/traces/histogram2d/attributes.js
index 72befadf1fd..ae4648c929f 100644
--- a/src/traces/histogram2d/attributes.js
+++ b/src/traces/histogram2d/attributes.js
@@ -12,8 +12,7 @@ var histogramAttrs = require('../histogram/attributes');
 var makeBinAttrs = require('../histogram/bin_attributes');
 var heatmapAttrs = require('../heatmap/attributes');
 var hovertemplateAttrs = require('../../components/fx/hovertemplate_attributes');
-var colorscaleAttrs = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 
 var extendFlat = require('../../lib/extend').extendFlat;
 
@@ -51,9 +50,5 @@ module.exports = extendFlat(
         zhoverformat: heatmapAttrs.zhoverformat,
         hovertemplate: hovertemplateAttrs({}, {keys: 'z'})
     },
-    colorscaleAttrs('', {
-        cLetter: 'z',
-        autoColorDflt: false
-    }),
-    { colorbar: colorbarAttrs }
+    colorScaleAttrs('', {cLetter: 'z', autoColorDflt: false})
 );
diff --git a/src/traces/histogram2dcontour/attributes.js b/src/traces/histogram2dcontour/attributes.js
index 2dfe6dc89c2..19c4db142bf 100644
--- a/src/traces/histogram2dcontour/attributes.js
+++ b/src/traces/histogram2dcontour/attributes.js
@@ -10,8 +10,7 @@
 
 var histogram2dAttrs = require('../histogram2d/attributes');
 var contourAttrs = require('../contour/attributes');
-var colorscaleAttrs = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 
 var extendFlat = require('../../lib/extend').extendFlat;
 
@@ -37,9 +36,8 @@ module.exports = extendFlat({
     zhoverformat: histogram2dAttrs.zhoverformat,
     hovertemplate: histogram2dAttrs.hovertemplate
 },
-    colorscaleAttrs('', {
+    colorScaleAttrs('', {
         cLetter: 'z',
         editTypeOverride: 'calc'
-    }),
-    { colorbar: colorbarAttrs }
+    })
 );
diff --git a/src/traces/isosurface/attributes.js b/src/traces/isosurface/attributes.js
index bff5d187dd3..37cf47f316e 100644
--- a/src/traces/isosurface/attributes.js
+++ b/src/traces/isosurface/attributes.js
@@ -8,8 +8,7 @@
 
 'use strict';
 
-var colorscaleAttrs = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 var hovertemplateAttrs = require('../../components/fx/hovertemplate_attributes');
 var meshAttrs = require('../mesh3d/attributes');
 var baseAttrs = require('../../plots/attributes');
@@ -236,14 +235,11 @@ var attrs = module.exports = overrideAll(extendFlat({
     hovertemplate: hovertemplateAttrs()
 },
 
-colorscaleAttrs('', {
+colorScaleAttrs('', {
     colorAttr: '`value`',
     showScaleDflt: true,
     editTypeOverride: 'calc'
 }), {
-
-    colorbar: colorbarAttrs,
-
     opacity: meshAttrs.opacity,
     lightposition: meshAttrs.lightposition,
     lighting: meshAttrs.lighting,
diff --git a/src/traces/isosurface/convert.js b/src/traces/isosurface/convert.js
index 0e50885f9e7..d3a67e00f25 100644
--- a/src/traces/isosurface/convert.js
+++ b/src/traces/isosurface/convert.js
@@ -6,15 +6,16 @@
 * LICENSE file in the root directory of this source tree.
 */
 
-
 'use strict';
 
 var createMesh = require('gl-mesh3d');
 
+var Lib = require('../../lib');
+
 var parseColorScale = require('../../lib/gl_format_color').parseColorScale;
 var str2RgbaArray = require('../../lib/str2rgbarray');
+var extractOpts = require('../../components/colorscale').extractOpts;
 var zip3 = require('../../plots/gl3d/zip3');
-var Lib = require('../../lib');
 
 function distinctVals(col) {
     return Lib.distinctVals(col).vals;
@@ -121,8 +122,9 @@ proto.update = function(data) {
         useFacetNormals: data.flatshading
     };
 
+    var cOpts = extractOpts(data);
     config.vertexIntensity = data._intensity;
-    config.vertexIntensityBounds = [data.cmin, data.cmax];
+    config.vertexIntensityBounds = [cOpts.min, cOpts.max];
     config.colormap = parseColorScale(data);
 
     // Update mesh
diff --git a/src/traces/mesh3d/attributes.js b/src/traces/mesh3d/attributes.js
index bd90dfb8e86..c383df63a7a 100644
--- a/src/traces/mesh3d/attributes.js
+++ b/src/traces/mesh3d/attributes.js
@@ -8,8 +8,7 @@
 
 'use strict';
 
-var colorscaleAttrs = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 var hovertemplateAttrs = require('../../components/fx/hovertemplate_attributes');
 var surfaceAtts = require('../surface/attributes');
 var baseAttrs = require('../../plots/attributes');
@@ -178,14 +177,11 @@ module.exports = extendFlat({
     transforms: undefined
 },
 
-colorscaleAttrs('', {
+colorScaleAttrs('', {
     colorAttr: '`intensity`',
     showScaleDflt: true,
     editTypeOverride: 'calc'
 }), {
-
-    colorbar: colorbarAttrs,
-
     opacity: surfaceAtts.opacity,
 
     // Flat shaded mode
diff --git a/src/traces/mesh3d/convert.js b/src/traces/mesh3d/convert.js
index dca58ed8355..bc9b69ebfa4 100644
--- a/src/traces/mesh3d/convert.js
+++ b/src/traces/mesh3d/convert.js
@@ -6,7 +6,6 @@
 * LICENSE file in the root directory of this source tree.
 */
 
-
 'use strict';
 
 var createMesh = require('gl-mesh3d');
@@ -16,6 +15,7 @@ var convexHull = require('convex-hull');
 
 var parseColorScale = require('../../lib/gl_format_color').parseColorScale;
 var str2RgbaArray = require('../../lib/str2rgbarray');
+var extractOpts = require('../../components/colorscale').extractOpts;
 var zip3 = require('../../plots/gl3d/zip3');
 
 function Mesh3DTrace(scene, mesh, uid) {
@@ -158,9 +158,10 @@ proto.update = function(data) {
     };
 
     if(data.intensity) {
+        var cOpts = extractOpts(data);
         this.color = '#fff';
         config.vertexIntensity = data.intensity;
-        config.vertexIntensityBounds = [data.cmin, data.cmax];
+        config.vertexIntensityBounds = [cOpts.min, cOpts.max];
         config.colormap = parseColorScale(data);
     } else if(data.vertexcolor) {
         this.color = data.vertexcolor[0];
diff --git a/src/traces/parcats/attributes.js b/src/traces/parcats/attributes.js
index 98b6ada66cd..a2188a08636 100644
--- a/src/traces/parcats/attributes.js
+++ b/src/traces/parcats/attributes.js
@@ -11,19 +11,14 @@
 var extendFlat = require('../../lib/extend').extendFlat;
 var plotAttrs = require('../../plots/attributes');
 var fontAttrs = require('../../plots/font_attributes');
-var colorAttributes = require('../../components/colorscale/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 var hovertemplateAttrs = require('../../components/fx/hovertemplate_attributes');
 var domainAttrs = require('../../plots/domain').attributes;
-var scatterAttrs = require('../scatter/attributes');
-var scatterLineAttrs = scatterAttrs.line;
-var colorbarAttrs = require('../../components/colorbar/attributes');
 
-var line = extendFlat({
-    editType: 'calc'
-}, colorAttributes('line', {editType: 'calc'}),
+var line = extendFlat(
+    {editType: 'calc'},
+    colorScaleAttrs('line', {editTypeOverride: 'calc'}),
     {
-        showscale: scatterLineAttrs.showscale,
-        colorbar: colorbarAttrs,
         shape: {
             valType: 'enumerated',
             values: ['linear', 'hspline'],
@@ -46,7 +41,8 @@ var line = extendFlat({
                 'This value here applies when hovering over lines.'
             ].join(' ')
         })
-    });
+    }
+);
 
 module.exports = {
     domain: domainAttrs({name: 'parcats', trace: true, editType: 'calc'}),
diff --git a/src/traces/parcoords/attributes.js b/src/traces/parcoords/attributes.js
index 7994896990b..bf1f7223410 100644
--- a/src/traces/parcoords/attributes.js
+++ b/src/traces/parcoords/attributes.js
@@ -8,8 +8,7 @@
 
 'use strict';
 
-var colorAttributes = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 var axesAttrs = require('../../plots/cartesian/layout_attributes');
 var fontAttrs = require('../../plots/font_attributes');
 var domainAttrs = require('../../plots/domain').attributes;
@@ -112,15 +111,13 @@ module.exports = {
         description: 'The dimensions (variables) of the parallel coordinates chart. 2..60 dimensions are supported.'
     }),
 
-    line: extendFlat(
-        colorAttributes('line', {
+    line: extendFlat({editType: 'calc'},
+        colorScaleAttrs('line', {
             // the default autocolorscale isn't quite usable for parcoords due to context ambiguity around 0 (grey, off-white)
             // autocolorscale therefore defaults to false too, to avoid being overridden by the  blue-white-red autocolor palette
             colorscaleDflt: 'Viridis',
             autoColorDflt: false,
             editTypeOverride: 'calc'
-        }), {
-            colorbar: colorbarAttrs,
-            editType: 'calc'
         })
+    )
 };
diff --git a/src/traces/scatter/attributes.js b/src/traces/scatter/attributes.js
index 86f8161f82e..e46a5f75513 100644
--- a/src/traces/scatter/attributes.js
+++ b/src/traces/scatter/attributes.js
@@ -9,8 +9,7 @@
 'use strict';
 
 var hovertemplateAttrs = require('../../components/fx/hovertemplate_attributes');
-var colorAttributes = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 var fontAttrs = require('../../plots/font_attributes');
 var dash = require('../../components/drawing/attributes').dash;
 
@@ -415,8 +414,6 @@ module.exports = {
             ].join(' ')
         },
 
-        colorbar: colorbarAttrs,
-
         line: extendFlat({
             width: {
                 valType: 'number',
@@ -429,7 +426,7 @@ module.exports = {
             },
             editType: 'calc'
         },
-            colorAttributes('marker.line', {anim: true})
+            colorScaleAttrs('marker.line', {anim: true})
         ),
         gradient: {
             type: {
@@ -458,7 +455,7 @@ module.exports = {
         },
         editType: 'calc'
     },
-        colorAttributes('marker', {anim: true})
+        colorScaleAttrs('marker', {anim: true})
     ),
     selected: {
         marker: {
diff --git a/src/traces/scattercarpet/attributes.js b/src/traces/scattercarpet/attributes.js
index c263e3b333a..3c2fed05336 100644
--- a/src/traces/scattercarpet/attributes.js
+++ b/src/traces/scattercarpet/attributes.js
@@ -11,8 +11,7 @@
 var scatterAttrs = require('../scatter/attributes');
 var plotAttrs = require('../../plots/attributes');
 var hovertemplateAttrs = require('../../components/fx/hovertemplate_attributes');
-var colorAttributes = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 
 var extendFlat = require('../../lib/extend').extendFlat;
 
@@ -101,13 +100,13 @@ module.exports = {
             width: scatterMarkerLineAttrs.width,
             editType: 'calc'
         },
-            colorAttributes('marker.line')
+            colorScaleAttrs('marker.line')
         ),
         gradient: scatterMarkerAttrs.gradient,
         editType: 'calc'
-    }, colorAttributes('marker'), {
-        colorbar: colorbarAttrs
-    }),
+    },
+        colorScaleAttrs('marker')
+    ),
 
     textfont: scatterAttrs.textfont,
     textposition: scatterAttrs.textposition,
diff --git a/src/traces/scattergl/attributes.js b/src/traces/scattergl/attributes.js
index fb78d50a5b8..4aa74ec4202 100644
--- a/src/traces/scattergl/attributes.js
+++ b/src/traces/scattergl/attributes.js
@@ -10,7 +10,7 @@
 
 var plotAttrs = require('../../plots/attributes');
 var scatterAttrs = require('../scatter/attributes');
-var colorAttrs = require('../../components/colorscale/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 
 var extendFlat = require('../../lib/extend').extendFlat;
 var overrideAll = require('../../plot_api/edit_types').overrideAll;
@@ -65,7 +65,7 @@ var attrs = module.exports = overrideAll({
             description: 'Sets the style of the lines.'
         }
     },
-    marker: extendFlat({}, colorAttrs('marker'), {
+    marker: extendFlat({}, colorScaleAttrs('marker'), {
         symbol: scatterMarkerAttrs.symbol,
         size: scatterMarkerAttrs.size,
         sizeref: scatterMarkerAttrs.sizeref,
@@ -73,7 +73,7 @@ var attrs = module.exports = overrideAll({
         sizemode: scatterMarkerAttrs.sizemode,
         opacity: scatterMarkerAttrs.opacity,
         colorbar: scatterMarkerAttrs.colorbar,
-        line: extendFlat({}, colorAttrs('marker.line'), {
+        line: extendFlat({}, colorScaleAttrs('marker.line'), {
             width: scatterMarkerLineAttrs.width
         })
     }),
diff --git a/src/traces/scattermapbox/attributes.js b/src/traces/scattermapbox/attributes.js
index 8609904e1a2..876e9e4f9c2 100644
--- a/src/traces/scattermapbox/attributes.js
+++ b/src/traces/scattermapbox/attributes.js
@@ -13,7 +13,7 @@ var scatterGeoAttrs = require('../scattergeo/attributes');
 var scatterAttrs = require('../scatter/attributes');
 var mapboxAttrs = require('../../plots/mapbox/layout_attributes');
 var plotAttrs = require('../../plots/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 
 var extendFlat = require('../../lib/extend').extendFlat;
 var overrideAll = require('../../plot_api/edit_types').overrideAll;
@@ -70,7 +70,7 @@ module.exports = overrideAll({
 
     connectgaps: scatterAttrs.connectgaps,
 
-    marker: {
+    marker: extendFlat({
         symbol: {
             valType: 'string',
             dflt: 'circle',
@@ -87,20 +87,11 @@ module.exports = overrideAll({
         size: markerAttrs.size,
         sizeref: markerAttrs.sizeref,
         sizemin: markerAttrs.sizemin,
-        sizemode: markerAttrs.sizemode,
-        color: markerAttrs.color,
-        colorscale: markerAttrs.colorscale,
-        cauto: markerAttrs.cauto,
-        cmax: markerAttrs.cmax,
-        cmin: markerAttrs.cmin,
-        cmid: markerAttrs.cmid,
-        autocolorscale: markerAttrs.autocolorscale,
-        reversescale: markerAttrs.reversescale,
-        showscale: markerAttrs.showscale,
-        colorbar: colorbarAttrs,
-
-        // line
+        sizemode: markerAttrs.sizemode
     },
+        colorScaleAttrs('marker')
+        // line
+    ),
 
     fill: scatterGeoAttrs.fill,
     fillcolor: scatterAttrs.fillcolor,
diff --git a/src/traces/scattermapbox/convert.js b/src/traces/scattermapbox/convert.js
index 5dbc94ced6a..8aba0245549 100644
--- a/src/traces/scattermapbox/convert.js
+++ b/src/traces/scattermapbox/convert.js
@@ -157,9 +157,7 @@ function makeCircleOpts(calcTrace) {
     var colorFn;
     if(arrayColor) {
         if(Colorscale.hasColorscale(trace, 'marker')) {
-            colorFn = Colorscale.makeColorScaleFunc(
-                 Colorscale.extractScale(marker, {cLetter: 'c'})
-             );
+            colorFn = Colorscale.makeColorScaleFuncFromTrace(marker);
         } else {
             colorFn = Lib.identity;
         }
diff --git a/src/traces/scatterternary/attributes.js b/src/traces/scatterternary/attributes.js
index 439259f7897..9b86099c84b 100644
--- a/src/traces/scatterternary/attributes.js
+++ b/src/traces/scatterternary/attributes.js
@@ -11,8 +11,7 @@
 var hovertemplateAttrs = require('../../components/fx/hovertemplate_attributes');
 var scatterAttrs = require('../scatter/attributes');
 var plotAttrs = require('../../plots/attributes');
-var colorAttributes = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 var dash = require('../../components/drawing/attributes').dash;
 
 var extendFlat = require('../../lib/extend').extendFlat;
@@ -130,13 +129,13 @@ module.exports = {
             width: scatterMarkerLineAttrs.width,
             editType: 'calc'
         },
-            colorAttributes('marker.line')
+            colorScaleAttrs('marker.line')
         ),
         gradient: scatterMarkerAttrs.gradient,
         editType: 'calc'
-    }, colorAttributes('marker'), {
-        colorbar: colorbarAttrs
-    }),
+    },
+        colorScaleAttrs('marker')
+    ),
 
     textfont: scatterAttrs.textfont,
     textposition: scatterAttrs.textposition,
diff --git a/src/traces/splom/attributes.js b/src/traces/splom/attributes.js
index d7c8e7fc311..e75878fdf25 100644
--- a/src/traces/splom/attributes.js
+++ b/src/traces/splom/attributes.js
@@ -9,7 +9,7 @@
 'use strict';
 
 var scatterAttrs = require('../scatter/attributes');
-var colorAttrs = require('../../components/colorscale/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 var hovertemplateAttrs = require('../../components/fx/hovertemplate_attributes');
 var scatterGlAttrs = require('../scattergl/attributes');
 var cartesianIdRegex = require('../../plots/cartesian/constants').idRegex;
@@ -19,12 +19,12 @@ var extendFlat = require('../../lib/extend').extendFlat;
 var scatterMarkerAttrs = scatterAttrs.marker;
 var scatterMarkerLineAttrs = scatterMarkerAttrs.line;
 
-var markerLineAttrs = extendFlat(colorAttrs('marker.line', {editTypeOverride: 'calc'}), {
+var markerLineAttrs = extendFlat(colorScaleAttrs('marker.line', {editTypeOverride: 'calc'}), {
     width: extendFlat({}, scatterMarkerLineAttrs.width, {editType: 'calc'}),
     editType: 'calc'
 });
 
-var markerAttrs = extendFlat(colorAttrs('marker'), {
+var markerAttrs = extendFlat(colorScaleAttrs('marker'), {
     symbol: scatterMarkerAttrs.symbol,
     size: extendFlat({}, scatterMarkerAttrs.size, {editType: 'markerSize'}),
     sizeref: scatterMarkerAttrs.sizeref,
diff --git a/src/traces/streamtube/attributes.js b/src/traces/streamtube/attributes.js
index c1a4c08810e..47b4f2f103b 100644
--- a/src/traces/streamtube/attributes.js
+++ b/src/traces/streamtube/attributes.js
@@ -8,8 +8,7 @@
 
 'use strict';
 
-var colorscaleAttrs = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 var hovertemplateAttrs = require('../../components/fx/hovertemplate_attributes');
 var mesh3dAttrs = require('../mesh3d/attributes');
 var baseAttrs = require('../../plots/attributes');
@@ -148,13 +147,11 @@ var attrs = {
     })
 };
 
-extendFlat(attrs, colorscaleAttrs('', {
+extendFlat(attrs, colorScaleAttrs('', {
     colorAttr: 'u/v/w norm',
     showScaleDflt: true,
     editTypeOverride: 'calc'
-}), {
-    colorbar: colorbarAttrs
-});
+}));
 
 var fromMesh3d = ['opacity', 'lightposition', 'lighting'];
 fromMesh3d.forEach(function(k) {
diff --git a/src/traces/streamtube/convert.js b/src/traces/streamtube/convert.js
index ced5c0b1508..a958fb3cbfc 100644
--- a/src/traces/streamtube/convert.js
+++ b/src/traces/streamtube/convert.js
@@ -13,6 +13,7 @@ var createTubeMesh = tube2mesh.createTubeMesh;
 
 var Lib = require('../../lib');
 var parseColorScale = require('../../lib/gl_format_color').parseColorScale;
+var extractOpts = require('../../components/colorscale').extractOpts;
 var zip3 = require('../../plots/gl3d/zip3');
 
 var axisName2scaleIndex = {xaxis: 0, yaxis: 1, zaxis: 2};
@@ -177,7 +178,8 @@ function convert(scene, trace) {
     // N.B. cmin/cmax correspond to the min/max vector norm
     // in the u/v/w arrays, which in general is NOT equal to max
     // intensity that colors the tubes.
-    meshData.vertexIntensityBounds = [trace.cmin / trace._normMax, trace.cmax / trace._normMax];
+    var cOpts = extractOpts(trace);
+    meshData.vertexIntensityBounds = [cOpts.min / trace._normMax, cOpts.max / trace._normMax];
 
     // pass gl-mesh3d lighting attributes
     var lp = trace.lightposition;
diff --git a/src/traces/surface/attributes.js b/src/traces/surface/attributes.js
index 56c8f14cfe8..7e0fbfe0a6f 100644
--- a/src/traces/surface/attributes.js
+++ b/src/traces/surface/attributes.js
@@ -9,8 +9,7 @@
 'use strict';
 
 var Color = require('../../components/color');
-var colorscaleAttrs = require('../../components/colorscale/attributes');
-var colorbarAttrs = require('../../components/colorbar/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 var hovertemplateAttrs = require('../../components/fx/hovertemplate_attributes');
 var baseAttrs = require('../../plots/attributes');
 
@@ -188,14 +187,12 @@ var attrs = module.exports = overrideAll(extendFlat({
     },
 },
 
-colorscaleAttrs('', {
+colorScaleAttrs('', {
     colorAttr: 'z or surfacecolor',
     showScaleDflt: true,
     autoColorDflt: false,
     editTypeOverride: 'calc'
 }), {
-    colorbar: colorbarAttrs,
-
     contours: {
         x: makeContourAttr('x'),
         y: makeContourAttr('y'),
@@ -302,13 +299,13 @@ colorscaleAttrs('', {
     },
 
     _deprecated: {
-        zauto: extendFlat({}, colorscaleAttrs.zauto, {
+        zauto: extendFlat({}, colorScaleAttrs.zauto, {
             description: 'Obsolete. Use `cauto` instead.'
         }),
-        zmin: extendFlat({}, colorscaleAttrs.zmin, {
+        zmin: extendFlat({}, colorScaleAttrs.zmin, {
             description: 'Obsolete. Use `cmin` instead.'
         }),
-        zmax: extendFlat({}, colorscaleAttrs.zmax, {
+        zmax: extendFlat({}, colorScaleAttrs.zmax, {
             description: 'Obsolete. Use `cmax` instead.'
         })
     },
diff --git a/src/traces/surface/convert.js b/src/traces/surface/convert.js
index 1be1c4d50e9..9b2e44eb123 100644
--- a/src/traces/surface/convert.js
+++ b/src/traces/surface/convert.js
@@ -18,6 +18,7 @@ var fill = require('ndarray-fill');
 var isArrayOrTypedArray = require('../../lib').isArrayOrTypedArray;
 var parseColorScale = require('../../lib/gl_format_color').parseColorScale;
 var str2RgbaArray = require('../../lib/str2rgbarray');
+var extractOpts = require('../../components/colorscale').extractOpts;
 
 var interp2d = require('../heatmap/interp2d');
 var findEmpties = require('../heatmap/find_empties');
@@ -534,7 +535,8 @@ proto.update = function(data) {
         opacity: data.opacity
     };
 
-    params.intensityBounds = [data.cmin, data.cmax];
+    var cOpts = extractOpts(data);
+    params.intensityBounds = [cOpts.min, cOpts.max];
 
     // Refine surface color if necessary
     if(data.surfacecolor) {
diff --git a/src/traces/volume/attributes.js b/src/traces/volume/attributes.js
index f677ed0b1cd..adf1e14eb6f 100644
--- a/src/traces/volume/attributes.js
+++ b/src/traces/volume/attributes.js
@@ -8,7 +8,7 @@
 
 'use strict';
 
-var colorscaleAttrs = require('../../components/colorscale/attributes');
+var colorScaleAttrs = require('../../components/colorscale/attributes');
 var isosurfaceAttrs = require('../isosurface/attributes');
 var baseAttrs = require('../../plots/attributes');
 
@@ -55,7 +55,7 @@ var attrs = module.exports = overrideAll(extendFlat({
     hovertemplate: isosurfaceAttrs.hovertemplate
 },
 
-colorscaleAttrs('', {
+colorScaleAttrs('', {
     colorAttr: '`value`',
     showScaleDflt: true,
     editTypeOverride: 'calc'
diff --git a/src/traces/volume/convert.js b/src/traces/volume/convert.js
index 219b191fd60..03437b0ad37 100644
--- a/src/traces/volume/convert.js
+++ b/src/traces/volume/convert.js
@@ -6,13 +6,13 @@
 * LICENSE file in the root directory of this source tree.
 */
 
-
 'use strict';
 
 var createMesh = require('gl-mesh3d');
 
 var parseColorScale = require('../../lib/gl_format_color').parseColorScale;
 var str2RgbaArray = require('../../lib/str2rgbarray');
+var extractOpts = require('../../components/colorscale').extractOpts;
 var zip3 = require('../../plots/gl3d/zip3');
 
 var findNearestOnAxis = require('../isosurface/convert').findNearestOnAxis;
@@ -103,8 +103,9 @@ proto.update = function(data) {
         useFacetNormals: data.flatshading
     };
 
+    var cOpts = extractOpts(data);
     config.vertexIntensity = data._intensity;
-    config.vertexIntensityBounds = [data.cmin, data.cmax];
+    config.vertexIntensityBounds = [cOpts.min, cOpts.max];
     config.colormap = parseColorScale(data);
 
     // Update mesh
diff --git a/test/image/baselines/contour-heatmap-coloring-set-contours.png b/test/image/baselines/contour-heatmap-coloring-set-contours.png
new file mode 100644
index 00000000000..2bce86a4600
Binary files /dev/null and b/test/image/baselines/contour-heatmap-coloring-set-contours.png differ
diff --git a/test/image/baselines/gl3d_coloraxes.png b/test/image/baselines/gl3d_coloraxes.png
new file mode 100644
index 00000000000..1030595b4c4
Binary files /dev/null and b/test/image/baselines/gl3d_coloraxes.png differ
diff --git a/test/image/baselines/gl3d_ribbons.png b/test/image/baselines/gl3d_ribbons.png
index 0309f7c7ccc..f9083f8357f 100644
Binary files a/test/image/baselines/gl3d_ribbons.png and b/test/image/baselines/gl3d_ribbons.png differ
diff --git a/test/image/baselines/gl3d_scatter3d-colorscale-marker-and-line.png b/test/image/baselines/gl3d_scatter3d-colorscale-marker-and-line.png
new file mode 100644
index 00000000000..b5b807b9f5c
Binary files /dev/null and b/test/image/baselines/gl3d_scatter3d-colorscale-marker-and-line.png differ
diff --git a/test/image/baselines/shared_coloraxes.png b/test/image/baselines/shared_coloraxes.png
new file mode 100644
index 00000000000..9941fa6a668
Binary files /dev/null and b/test/image/baselines/shared_coloraxes.png differ
diff --git a/test/image/baselines/shared_coloraxes_contour.png b/test/image/baselines/shared_coloraxes_contour.png
new file mode 100644
index 00000000000..b8e32c1db24
Binary files /dev/null and b/test/image/baselines/shared_coloraxes_contour.png differ
diff --git a/test/image/mocks/contour-heatmap-coloring-set-contours.json b/test/image/mocks/contour-heatmap-coloring-set-contours.json
new file mode 100644
index 00000000000..8b74c0f6250
--- /dev/null
+++ b/test/image/mocks/contour-heatmap-coloring-set-contours.json
@@ -0,0 +1,28 @@
+{
+  "data": [{
+    "name": "with set contours",
+    "type": "contour",
+    "x": [1, 2, 3],
+    "z": [[1, 2, 3], [1, 2, 3]],
+    "contours": {
+      "coloring": "heatmap",
+      "start": 0, "end": 5
+    },
+    "colorbar": {
+      "x": -0.05, "xanchor": "right",
+      "title": {"text": "with set<br>contours"}
+    }
+  }, {
+    "type": "contour",
+    "name": "auto contours",
+    "x": [5, 6, 7],
+    "z": [[1, 2, 3], [1, 2, 3]],
+    "contours": {
+      "coloring": "heatmap"
+    },
+    "colorbar": {
+      "x": 1.05, "xanchor": "left",
+      "title": {"text": "auto<br>contours"}
+    }
+  }]
+}
diff --git a/test/image/mocks/gl3d_coloraxes.json b/test/image/mocks/gl3d_coloraxes.json
new file mode 100644
index 00000000000..377cb0653a9
--- /dev/null
+++ b/test/image/mocks/gl3d_coloraxes.json
@@ -0,0 +1,1243 @@
+{
+  "data": [{
+      "type": "cone",
+      "x": [2, 3],
+      "y": [2, 3],
+      "z": [2, 3],
+      "u": [0, 0],
+      "v": [3, 0],
+      "w": [0, 2],
+      "coloraxis": "coloraxis"
+  }, {
+      "type": "streamtube",
+      "x": [0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2],
+      "y": [0, 0, 0, 1, 1, 1, 2, 2, 2, 0, 0, 0, 1, 1, 1, 2, 2, 2, 0, 0, 0, 1, 1, 1, 2, 2, 2],
+      "z": [0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2],
+      "u": [
+        1,
+        1,
+        1,
+        1,
+        1,
+        1,
+        1,
+        1,
+        1,
+        1.8414709848078965,
+        1.8414709848078965,
+        1.8414709848078965,
+        1.8414709848078965,
+        1.8414709848078965,
+        1.8414709848078965,
+        1.8414709848078965,
+        1.8414709848078965,
+        1.8414709848078965,
+        1.9092974268256817,
+        1.9092974268256817,
+        1.9092974268256817,
+        1.9092974268256817,
+        1.9092974268256817,
+        1.9092974268256817,
+        1.9092974268256817,
+        1.9092974268256817,
+        1.9092974268256817
+      ],
+      "v": [
+        1,
+        1,
+        1,
+        0.5403023058681398,
+        0.5403023058681398,
+        0.5403023058681398,
+        -0.4161468365471424,
+        -0.4161468365471424,
+        -0.4161468365471424,
+        1,
+        1,
+        1,
+        0.5403023058681398,
+        0.5403023058681398,
+        0.5403023058681398,
+        -0.4161468365471424,
+        -0.4161468365471424,
+        -0.4161468365471424,
+        1,
+        1,
+        1,
+        0.5403023058681398,
+        0.5403023058681398,
+        0.5403023058681398,
+        -0.4161468365471424,
+        -0.4161468365471424,
+        -0.4161468365471424
+      ],
+      "w": [
+        0,
+        0.08865606199840186,
+        0.1693927420185106,
+        0,
+        0.08865606199840186,
+        0.1693927420185106,
+        0,
+        0.08865606199840186,
+        0.1693927420185106,
+        0,
+        0.08865606199840186,
+        0.1693927420185106,
+        0,
+        0.08865606199840186,
+        0.1693927420185106,
+        0,
+        0.08865606199840186,
+        0.1693927420185106,
+        0,
+        0.08865606199840186,
+        0.1693927420185106,
+        0,
+        0.08865606199840186,
+        0.1693927420185106,
+        0,
+        0.08865606199840186,
+        0.1693927420185106
+      ],
+      "sizeref": 0.5,
+      "coloraxis": "coloraxis"
+  }, {
+      "type":"mesh3d",
+      "x":[0, 1, 2, 0],
+      "y":[0, 0, 1, 2],
+      "z":[0, 2, 0, 1],
+      "i":[0, 0, 0, 1],
+      "j":[1, 2, 3, 2],
+      "k":[2, 3, 1, 3],
+      "intensity": [0, 1, 2, 3],
+      "coloraxis": "coloraxis"
+  },
+
+  {
+      "type": "isosurface",
+      "value": [
+          0, 125, 250, 375, 500, 625, 750, 875, 1000,
+          -125, 0, 125, 250, 375, 500, 625, 750, 875,
+          -250, -125, 0, 125, 250, 375, 500, 625, 750,
+          -375, -250, -125, 0, 125, 250, 375, 500, 625,
+          -500, -375, -250, -125, 0, 125, 250, 375, 500,
+          -625, -500, -375, -250, -125, 0, 125, 250, 375,
+          -750, -625, -500, -375, -250, -125, 0, 125, 250,
+          -875, -750, -625, -500, -375, -250, -125, 0, 125,
+          -1000, -875, -750, -625, -500, -375, -250, -125, 0,
+
+          -125, 0, 125, 250, 375, 500, 625, 750, 875,
+          -250, -121, 8, 137, 266, 395, 523, 652, 781,
+          -375, -242, -109, 23, 156, 289, 422, 555, 688,
+          -500, -363, -227, -90, 47, 184, 320, 457, 594,
+          -625, -484, -344, -203, -63, 78, 219, 359, 500,
+          -750, -605, -461, -316, -172, -27, 117, 262, 406,
+          -875, -727, -578, -430, -281, -133, 16, 164, 313,
+          -1000, -848, -695, -543, -391, -238, -86, 66, 219,
+          -1125, -969, -813, -656, -500, -344, -188, -31, 125,
+
+          -250, -125, 0, 125, 250, 375, 500, 625, 750,
+          -375, -242, -109, 23, 156, 289, 422, 555, 688,
+          -500, -359, -219, -78, 63, 203, 344, 484, 625,
+          -625, -477, -328, -180, -31, 117, 266, 414, 563,
+          -750, -594, -438, -281, -125, 31, 188, 344, 500,
+          -875, -711, -547, -383, -219, -55, 109, 273, 438,
+          -1000, -828, -656, -484, -313, -141, 31, 203, 375,
+          -1125, -945, -766, -586, -406, -227, -47, 133, 313,
+          -1250, -1063, -875, -688, -500, -313, -125, 63, 250,
+
+          -375, -250, -125, 0, 125, 250, 375, 500, 625,
+          -500, -363, -227, -90, 47, 184, 320, 457, 594,
+          -625, -477, -328, -180, -31, 117, 266, 414, 563,
+          -750, -590, -430, -270, -109, 51, 211, 371, 531,
+          -875, -703, -531, -359, -188, -16, 156, 328, 500,
+          -1000, -816, -633, -449, -266, -82, 102, 285, 469,
+          -1125, -930, -734, -539, -344, -148, 47, 242, 438,
+          -1250, -1043, -836, -629, -422, -215, -8, 199, 406,
+          -1375, -1156, -938, -719, -500, -281, -63, 156, 375,
+
+          -500, -375, -250, -125, 0, 125, 250, 375, 500,
+          -625, -484, -344, -203, -63, 78, 219, 359, 500,
+          -750, -594, -438, -281, -125, 31, 188, 344, 500,
+          -875, -703, -531, -359, -188, -16, 156, 328, 500,
+          -1000, -813, -625, -438, -250, -63, 125, 313, 500,
+          -1125, -922, -719, -516, -313, -109, 94, 297, 500,
+          -1250, -1031, -813, -594, -375, -156, 63, 281, 500,
+          -1375, -1141, -906, -672, -438, -203, 31, 266, 500,
+          -1500, -1250, -1000, -750, -500, -250, 0, 250, 500,
+
+          -625, -500, -375, -250, -125, 0, 125, 250, 375,
+          -750, -605, -461, -316, -172, -27, 117, 262, 406,
+          -875, -711, -547, -383, -219, -55, 109, 273, 438,
+          -1000, -816, -633, -449, -266, -82, 102, 285, 469,
+          -1125, -922, -719, -516, -313, -109, 94, 297, 500,
+          -1250, -1027, -805, -582, -359, -137, 86, 309, 531,
+          -1375, -1133, -891, -648, -406, -164, 78, 320, 563,
+          -1500, -1238, -977, -715, -453, -191, 70, 332, 594,
+          -1625, -1344, -1063, -781, -500, -219, 63, 344, 625,
+
+          -750, -625, -500, -375, -250, -125, 0, 125, 250,
+          -875, -727, -578, -430, -281, -133, 16, 164, 313,
+          -1000, -828, -656, -484, -313, -141, 31, 203, 375,
+          -1125, -930, -734, -539, -344, -148, 47, 242, 438,
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+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000,
+         0.000, 0.007, 0.028, 0.063, 0.111, 0.174, 0.250, 0.340, 0.444, 0.563, 0.694, 0.840, 1.000
+     ],
+
+      "scene": "scene2",
+      "coloraxis": "coloraxis2"
+  }],
+
+  "layout": {
+    "title": "gl3d trace with shared coloraxes",
+
+    "coloraxis": {
+      "colorscale": "Viridis",
+      "colorbar": {
+        "x": -0.1,
+        "xanchor": "right"
+      }
+    },
+    "coloraxis2": {
+      "colorscale": "Viridis",
+      "colorbar": {
+        "x": 1.1,
+        "xanchor": "left"
+      }
+    }
+  }
+}
diff --git a/test/image/mocks/gl3d_ribbons.json b/test/image/mocks/gl3d_ribbons.json
index 0aa647b52b1..dd993dc2b0a 100644
--- a/test/image/mocks/gl3d_ribbons.json
+++ b/test/image/mocks/gl3d_ribbons.json
@@ -607,7 +607,8 @@
                     0.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -1216,7 +1217,8 @@
                     1.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -1825,7 +1827,8 @@
                     2.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -2434,7 +2437,8 @@
                     3.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -3043,7 +3047,8 @@
                     4.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -3652,7 +3657,8 @@
                     5.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -4261,7 +4267,8 @@
                     6.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -4870,7 +4877,8 @@
                     7.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -5479,7 +5487,8 @@
                     8.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -6088,7 +6097,8 @@
                     9.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -6697,7 +6707,8 @@
                     10.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -7306,7 +7317,8 @@
                     11.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -7915,7 +7927,8 @@
                     12.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -8524,7 +8537,8 @@
                     13.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -9133,7 +9147,8 @@
                     14.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -9742,7 +9757,8 @@
                     15.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -10351,7 +10367,8 @@
                     16.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -10960,7 +10977,8 @@
                     17.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         },
         {
             "z": [
@@ -11569,7 +11587,8 @@
                     18.75
                 ]
             ],
-            "type": "surface"
+            "type": "surface",
+            "coloraxis": "coloraxis"
         }
     ],
     "layout": {
diff --git a/test/image/mocks/gl3d_scatter3d-colorscale-marker-and-line.json b/test/image/mocks/gl3d_scatter3d-colorscale-marker-and-line.json
new file mode 100644
index 00000000000..6e08b7f8c23
--- /dev/null
+++ b/test/image/mocks/gl3d_scatter3d-colorscale-marker-and-line.json
@@ -0,0 +1,39 @@
+{
+    "data": [
+        {
+            "x": [1, 2, 4, 8, 16],
+            "y": [-1, -2, -4, -8, -16],
+            "z": [0, 1, 0, 1, 0],
+            "type": "scatter3d",
+            "mode": "lines+markers",
+            "line": {
+                "color": [0, 0.25, 0.5, 0.75, 1.0],
+                "width": 10,
+                "colorscale": "Blues",
+                "colorbar": {
+                    "len": 0.5,
+                    "y": 1,
+                    "yanchor": "top",
+                    "title": {"text": "line colorscale", "side": "right"}
+                }
+            },
+            "marker": {
+                "color": [1.0, 0.75, 0.5, 0.25, 0],
+                "size": 10,
+                "colorscale": "Reds",
+                "colorbar": {
+                    "len": 0.5,
+                    "y": 0,
+                    "yanchor": "bottom",
+                    "title": {"text": "marker colorscale", "side": "right"}
+                }
+
+            }
+        }
+    ],
+    "layout": {
+        "title": "Scatter3d show line AND marker color scales",
+        "width": 600,
+        "height": 600
+    }
+}
diff --git a/test/image/mocks/shared_coloraxes.json b/test/image/mocks/shared_coloraxes.json
new file mode 100644
index 00000000000..43634c68042
--- /dev/null
+++ b/test/image/mocks/shared_coloraxes.json
@@ -0,0 +1,125 @@
+{
+  "data": [{
+    "name": "heatmap 1 - coloraxis 1",
+    "type": "heatmap",
+    "x": [1, 2],
+    "z": [[1, 2], [4, -3]],
+    "coloraxis": "coloraxis"
+  }, {
+    "name": "heatmap 2 - coloraxis 1",
+    "type": "heatmap",
+    "x": [3, 4],
+    "z": [[10, 2], [4, 3]],
+    "coloraxis": "coloraxis"
+  }, {
+    "name": "heatmap 3 - coloraxis 1",
+    "type": "heatmap",
+    "x": [5, 6],
+    "z": [[3, -2], [4, 5]],
+    "coloraxis": "coloraxis"
+  },
+
+  {
+    "name": "bar marker.color scale - coloraxis 2",
+    "type": "bar",
+    "y": [1, 2, 1],
+    "marker": {
+      "color": [20, 2, 30],
+      "coloraxis": "coloraxis2"
+    },
+    "xaxis": "x2",
+    "yaxis": "y2"
+  }, {
+    "name": "marker.line.color scale - coloraxis 2",
+    "mode": "markers",
+    "y": [1.5, 2.5, 1.5],
+    "marker": {
+      "color": "#444",
+      "size": 10,
+      "line": {
+        "width": 2,
+        "color": [12, 2, 10],
+        "coloraxis": "coloraxis2"
+      }
+    },
+    "xaxis": "x2",
+    "yaxis": "y2"
+  },
+
+  {
+    "name": "histogram2d 1 - coloraxis 3",
+    "type": "histogram2d",
+    "x": [1, 2, 3, 3, 3, 4, 5],
+    "y": [1, 2, 5, 5, 5, 2, 1],
+    "coloraxis": "coloraxis3",
+    "xaxis": "x3",
+    "yaxis": "y3"
+  }, {
+    "name": "histogram2d 1 - coloraxis 3",
+    "type": "histogram2d",
+    "x": [1, 2, 5, 5, 5, 2, 1],
+    "y": [1, 2, 3, 3, 3, 4, 5],
+    "coloraxis": "coloraxis3",
+    "xaxis": "x3",
+    "yaxis": "y3"
+  },
+
+  {
+    "name": "scatterpolar marker.color - coloraxis 3 <b>N.B.</b> across subplots!",
+    "type": "scatterpolar",
+    "mode": "markers",
+    "r": [1, 2, 3],
+    "marker": {
+      "symbol": "diamond",
+      "size": 10,
+      "color": [2, 3, 4],
+      "coloraxis": "coloraxis3"
+    }
+  }],
+  "layout": {
+    "showlegend": false,
+    "grid": {"rows": 2, "columns": 2, "pattern": "independent"},
+    "polar": {"domain": {"row": 1, "column": 1}},
+
+    "coloraxis": {
+      "colorbar": {
+        "len": 0.5,
+        "x": -0.05, "xanchor": "right",
+        "y": 1, "yanchor": "top"
+      }
+    },
+    "coloraxis2": {
+      "colorbar": {
+        "len": 0.5,
+        "x": 1.05, "xanchor": "left",
+        "y": 1, "yanchor": "top"
+      }
+    },
+    "coloraxis3": {
+      "cauto": false,
+      "cmax": 5,
+      "colorscale": "Viridis",
+      "colorbar": {
+        "len": 0.5,
+        "x": -0.05, "xanchor": "right",
+        "y": 0, "yanchor": "bottom",
+        "dtick": 1
+      }
+    },
+
+    "colorscale": {
+      "sequential": "Greens"
+    },
+
+    "template": {
+      "layout": {
+        "coloraxis": {
+          "colorbar": {"outlinewidth": 2}
+        },
+        "coloraxis3": {
+          "colorbar": {"outlinecolor": "blue", "outlinewidth": 4}
+        }
+      }
+    }
+  }
+}
diff --git a/test/image/mocks/shared_coloraxes_contour.json b/test/image/mocks/shared_coloraxes_contour.json
new file mode 100644
index 00000000000..7f5df767f46
--- /dev/null
+++ b/test/image/mocks/shared_coloraxes_contour.json
@@ -0,0 +1,138 @@
+{
+  "data": [{
+    "name": "contour coloring:heatmap 1 - coloraxis 1",
+    "type": "contour",
+    "x": [1, 2],
+    "z": [[1, 2], [10, -3]],
+    "contours": {"coloring": "heatmap"},
+    "coloraxis": "coloraxis"
+  }, {
+    "name": "heatmap - coloraxis 1",
+    "type": "heatmap",
+    "x": [3, 4],
+    "z": [[4, 2], [4, 3]],
+    "coloraxis": "coloraxis"
+  }, {
+    "name": "markers - coloraxis 1",
+    "mode": "markers",
+    "x": [1, 3, 5],
+    "y": [1, 2, 1],
+    "marker": {
+      "size": 20,
+      "symbol": "diamond",
+      "color": [1, 2, 0],
+      "coloraxis": "coloraxis"
+    }
+  }, {
+    "name": "contour coloring:heatmap 2 - coloraxis 1",
+    "type": "contour",
+    "x": [5, 6],
+    "z": [[3, -6], [4, 5]],
+    "contours": {"coloring": "heatmap"},
+    "coloraxis": "coloraxis"
+  },
+
+  {
+    "name": "contour 1 - coloraxis 2",
+    "type": "contour",
+    "x": [1, 2],
+    "z": [[3, -6], [4, 5]],
+    "coloraxis": "coloraxis2",
+    "xaxis": "x2",
+    "yaxis": "y2"
+  }, {
+
+    "name": "contour 2 - coloraxis 2",
+    "type": "contour",
+    "x": [2, 3],
+    "z": [[1, 2], [10, -3]],
+    "coloraxis": "coloraxis2",
+    "xaxis": "x2",
+    "yaxis": "y2"
+  },
+
+  {
+    "name": "contour coloring:lines - coloraxis 3",
+    "type": "contour",
+    "x": [1, 2],
+    "z": [[3, -6], [4, 5]],
+    "contours": {"coloring": "lines"},
+    "line": {"width": 2},
+    "coloraxis": "coloraxis3",
+    "xaxis": "x3",
+    "yaxis": "y3"
+  }, {
+
+    "name": "contour coloring:lines 2 - coloraxis 3",
+    "type": "contour",
+    "x": [2, 3],
+    "z": [[1, 2], [10, -3]],
+    "contours": {"coloring": "lines"},
+    "line": {"width": 2},
+    "coloraxis": "coloraxis3",
+    "xaxis": "x3",
+    "yaxis": "y3"
+  },
+
+  {
+    "name": "contour coloring:heatmap edge case - coloraxis 4",
+    "type": "contour",
+    "x": [1, 2, 3],
+    "z": [[1, 2, 3], [1, 2, 3]],
+    "contours": {
+      "coloring": "heatmap",
+      "start": 1, "end": 5
+    },
+    "coloraxis": "coloraxis4",
+    "xaxis": "x4",
+    "yaxis": "y4"
+  }, {
+    "name": "contour coloring:heatmap edge case 2 - coloraxis 4",
+    "type": "contour",
+    "x": [5, 6, 7],
+    "z": [[2, 3, 4], [2, 3, 4]],
+    "contours": {
+      "coloring": "heatmap",
+      "start": 0, "end": 3
+    },
+    "coloraxis": "coloraxis4",
+    "xaxis": "x4",
+    "yaxis": "y4"
+  }],
+
+  "layout": {
+    "showlegend": false,
+    "grid": {"rows": 2, "columns": 2, "pattern": "independent"},
+
+    "coloraxis": {
+      "colorbar": {
+        "len": 0.5,
+        "x": -0.05, "xanchor": "right",
+        "y": 1, "yanchor": "top"
+      }
+    },
+    "coloraxis2": {
+      "colorbar": {
+        "dtick": 1,
+        "len": 0.5,
+        "x": 1.05, "xanchor": "left",
+        "y": 1, "yanchor": "top"
+      }
+    },
+    "coloraxis3": {
+      "colorbar": {
+        "len": 0.5,
+        "x": -0.05, "xanchor": "right",
+        "y": 0, "yanchor": "bottom"
+      }
+    },
+    "coloraxis4": {
+      "colorscale": "Viridis",
+      "colorbar": {
+        "len": 0.5,
+        "x": 1.05, "xanchor": "left",
+        "y": 0, "yanchor": "bottom"
+      }
+    }
+  }
+}
diff --git a/test/jasmine/bundle_tests/plotschema_test.js b/test/jasmine/bundle_tests/plotschema_test.js
index a515f5523cd..b92a9ec9b62 100644
--- a/test/jasmine/bundle_tests/plotschema_test.js
+++ b/test/jasmine/bundle_tests/plotschema_test.js
@@ -136,7 +136,8 @@ describe('plot schema', function() {
             'xaxis', 'yaxis', 'scene', 'geo', 'ternary', 'mapbox', 'polar',
             // not really a 'subplot' object but supports yaxis, yaxis2, yaxis3,
             // ... counters, so list it here
-            'xaxis.rangeslider.yaxis'
+            'xaxis.rangeslider.yaxis',
+            'coloraxis'
         ];
 
         // check if the subplot objects have '_isSubplotObj'
@@ -146,7 +147,7 @@ describe('plot schema', function() {
                     plotSchema.layout.layoutAttributes,
                     astr + '.' + IS_SUBPLOT_OBJ
                 ).get()
-            ).toBe(true);
+            ).toBe(true, astr);
         });
 
         // check that no other object has '_isSubplotObj'
diff --git a/test/jasmine/tests/colorbar_test.js b/test/jasmine/tests/colorbar_test.js
index 9468df91489..1314d3b6b7c 100644
--- a/test/jasmine/tests/colorbar_test.js
+++ b/test/jasmine/tests/colorbar_test.js
@@ -2,6 +2,8 @@ var d3 = require('d3');
 
 var Plotly = require('@lib/index');
 var Colorbar = require('@src/components/colorbar');
+var Plots = require('@src/plots/plots');
+var subroutines = require('@src/plot_api/subroutines');
 
 var createGraphDiv = require('../assets/create_graph_div');
 var destroyGraphDiv = require('../assets/destroy_graph_div');
@@ -10,7 +12,6 @@ var supplyAllDefaults = require('../assets/supply_defaults');
 var assertPlotSize = require('../assets/custom_assertions').assertPlotSize;
 var drag = require('../assets/drag');
 
-
 describe('Test colorbar:', function() {
     'use strict';
 
@@ -226,6 +227,41 @@ describe('Test colorbar:', function() {
             .then(done);
         });
 
+        it('can show and hide colorbars of shared color axes', function(done) {
+            Plotly.newPlot(gd, [{
+                y: [1, 2, 3],
+                marker: {color: [1, 2, 3], coloraxis: 'coloraxis'}
+            }, {
+                y: [1, 2, 3],
+                marker: {color: [1, 0, 3], coloraxis: 'coloraxis'}
+            }], {
+                showlegend: false,
+                height: 500,
+                width: 500,
+                margin: {l: 50, r: 50, t: 50, b: 50}
+            })
+            .then(function() {
+                assertCB('initial', true, {expandedMarginR: true});
+
+                return Plotly.relayout(gd, {'coloraxis.showscale': false});
+            })
+            .then(function() {
+                assertCB('hidden', false, {expandedMarginR: false});
+
+                return Plotly.relayout(gd, {'coloraxis.showscale': true, 'coloraxis.colorbar.x': 0.7});
+            })
+            .then(function() {
+                assertCB('mid-plot', true, {expandedMarginR: false});
+
+                return Plotly.relayout(gd, {'coloraxis.colorbar.x': 1.1});
+            })
+            .then(function() {
+                assertCB('far right', true, {expandedMarginR: true});
+            })
+            .catch(failTest)
+            .then(done);
+        });
+
         // histogram colorbars could not be edited before
         it('can show and hide histogram colorbars', function(done) {
             Plotly.newPlot(gd, [{
@@ -399,5 +435,93 @@ describe('Test colorbar:', function() {
             .catch(failTest)
             .then(done);
         });
+
+        it('can drag colorbars linked to color axes in editable mode', function(done) {
+            Plotly.newPlot(gd,
+                [{z: [[1, 2], [3, 4]], type: 'heatmap', coloraxis: 'coloraxis'}],
+                {coloraxis: {}, width: 400, height: 400},
+                {editable: true}
+            )
+            .then(function() {
+                expect(gd.layout.coloraxis.colorbar).toBeUndefined();
+                expect(gd._fullLayout.coloraxis.colorbar.x).toBe(1.02);
+                expect(gd._fullLayout.coloraxis.colorbar.y).toBe(0.5);
+                return drag(getCBNode(), -100, 100);
+            })
+            .then(function() {
+                expect(gd.layout.coloraxis.colorbar.x).toBeWithin(0.591, 0.01);
+                expect(gd.layout.coloraxis.colorbar.y).toBeWithin(0.045, 0.01);
+                expect(gd._fullLayout.coloraxis.colorbar.x).toBeWithin(0.591, 0.01);
+                expect(gd._fullLayout.coloraxis.colorbar.y).toBeWithin(0.045, 0.01);
+            })
+            .catch(failTest)
+            .then(done);
+        });
+
+        it('can edit colorbar visuals in optimized edit pathway', function(done) {
+            spyOn(subroutines, 'doColorBars').and.callThrough();
+            spyOn(Plots, 'doCalcdata').and.callThrough();
+
+            function getOutline(cb) {
+                return Number(cb.select('.cboutline').node().style['stroke-width']);
+            }
+
+            function _assert(msg, exp) {
+                var gd3 = d3.select(gd);
+                var cb0 = gd3.select('.cbtrace0');
+                var cb1 = gd3.select('.cbcoloraxis');
+
+                if(msg !== 'base') {
+                    expect(subroutines.doColorBars).toHaveBeenCalledTimes(1);
+                    expect(Plots.doCalcdata).toHaveBeenCalledTimes(0);
+                }
+                subroutines.doColorBars.calls.reset();
+                Plots.doCalcdata.calls.reset();
+
+                expect(getOutline(cb0)).toBe(exp.outline[0], 'trace0 cb outline');
+                expect(getOutline(cb1)).toBe(exp.outline[1], 'coloraxis cb outline');
+            }
+
+            Plotly.newPlot(gd, [{
+                type: 'heatmap',
+                z: [[1, 2, 3], [2, 1, 2]],
+                uid: 'trace0'
+            }, {
+                y: [1, 2, 3],
+                marker: {color: [2, 1, 2], coloraxis: 'coloraxis'}
+            }], {
+                width: 500,
+                height: 500
+            })
+            .then(function() { _assert('base', {outline: [1, 1]}); })
+            .then(function() {
+                return Plotly.restyle(gd, 'colorbar.outlinewidth', 2, [0]);
+            })
+            .then(function() { _assert('after restyle', {outline: [2, 1]}); })
+            .then(function() {
+                return Plotly.relayout(gd, 'coloraxis.colorbar.outlinewidth', 5);
+            })
+            .then(function() { _assert('after relayout', {outline: [2, 5]}); })
+            .then(function() {
+                return Plotly.update(gd, {'colorbar.outlinewidth': 1}, {}, [0]);
+            })
+            .then(function() { _assert('after trace update', {outline: [1, 5]}); })
+            .then(function() {
+                return Plotly.update(gd, {}, {'coloraxis.colorbar.outlinewidth': 1});
+            })
+            .then(function() { _assert('after layout update', {outline: [1, 1]}); })
+            .then(function() {
+                gd.data[0].colorbar = {outlinewidth: 10};
+                return Plotly.react(gd, gd.data, gd.layout);
+            })
+            .then(function() { _assert('after trace react', {outline: [10, 1]}); })
+            .then(function() {
+                gd.layout.coloraxis = {colorbar: {outlinewidth: 10}};
+                return Plotly.react(gd, gd.data, gd.layout);
+            })
+            .then(function() { _assert('after layout trace', {outline: [10, 10]}); })
+            .catch(failTest)
+            .then(done);
+        });
     });
 });
diff --git a/test/jasmine/tests/colorscale_test.js b/test/jasmine/tests/colorscale_test.js
index 281ab5ff2b9..551050987c7 100644
--- a/test/jasmine/tests/colorscale_test.js
+++ b/test/jasmine/tests/colorscale_test.js
@@ -13,14 +13,12 @@ var destroyGraphDiv = require('../assets/destroy_graph_div');
 var failTest = require('../assets/fail_test');
 var supplyAllDefaults = require('../assets/supply_defaults');
 
-function _supply(trace, layout) {
+function _supply(arg, layout) {
     var gd = {
-        data: [trace],
+        data: Array.isArray(arg) ? arg : [arg],
         layout: layout || {}
     };
-
     supplyAllDefaults(gd);
-
     return gd;
 }
 
@@ -259,7 +257,7 @@ describe('Test colorscale:', function() {
         }
 
         beforeEach(function() {
-            traceOut = {};
+            traceOut = {_module: {}};
         });
 
         it('should set auto to true when min/max are valid', function() {
@@ -330,7 +328,10 @@ describe('Test colorscale:', function() {
         }
 
         beforeEach(function() {
-            traceOut = { marker: {} };
+            traceOut = {
+                marker: {},
+                _module: {}
+            };
         });
 
         it('should coerce autocolorscale to true by default', function() {
@@ -368,6 +369,117 @@ describe('Test colorscale:', function() {
         });
     });
 
+    describe('handleDefaults (coloraxis version)', function() {
+        it('should not coerced colorscale/colorbar attributes when referencing a shared color axis', function() {
+            var gd = _supply([
+                {type: 'heatmap', z: [[0]]},
+                {type: 'heatmap', z: [[2]], coloraxis: 'coloraxis'},
+                {type: 'heatmap', z: [[2]], coloraxis: 'coloraxis'},
+            ]);
+
+            var fullData = gd._fullData;
+            var fullLayout = gd._fullLayout;
+
+            var zAttrs = ['zauto', 'colorscale', 'reversescale'];
+            zAttrs.forEach(function(attr) {
+                expect(fullData[0][attr]).not.toBe(undefined, 'trace 0 ' + attr);
+                expect(fullData[1][attr]).toBe(undefined, 'trace 1 ' + attr);
+                expect(fullData[2][attr]).toBe(undefined, 'trace 2 ' + attr);
+            });
+
+            var cAttrs = ['cauto', 'colorscale', 'reversescale'];
+            cAttrs.forEach(function(attr) {
+                expect(fullLayout.coloraxis[attr]).not.toBe(undefined, 'coloraxis ' + attr);
+            });
+
+            expect(fullData[0].coloraxis).toBe(undefined);
+            expect(fullData[1].coloraxis).toBe('coloraxis');
+            expect(fullData[2].coloraxis).toBe('coloraxis');
+            expect(fullLayout.coloraxis.coloraxis).toBe(undefined);
+            expect(fullLayout.coloraxis.showscale).toBe(true, 'showscale is true by dflt in color axes');
+        });
+
+        it('should keep track of all the color axes referenced in the traces', function() {
+            var gd = _supply([
+                {type: 'heatmap', z: [[1]], coloraxis: 'coloraxis'},
+                {y: [1], marker: {color: [1], coloraxis: 'coloraxis'}},
+                {type: 'contour', z: [[1]], coloraxis: 'coloraxis3'},
+                // invalid
+                {y: [1], marker: {color: [1], coloraxis: 'c1'}},
+                // not coerced - visible:false trace
+                {marker: {color: [1], coloraxis: 'coloraxis2'}}
+            ], {
+                // not referenced in traces, shouldn't get coerced
+                coloraxis4: {colorscale: 'Viridis'}
+            });
+
+            var fullData = gd._fullData;
+            var fullLayout = gd._fullLayout;
+
+            expect(fullData[0].coloraxis).toBe('coloraxis');
+            expect(fullData[1].marker.coloraxis).toBe('coloraxis');
+            expect(fullData[2].coloraxis).toBe('coloraxis3');
+            expect(fullData[3].coloraxis).toBe(undefined);
+
+            expect(fullData[0]._colorAx).toBe(fullLayout.coloraxis);
+            expect(fullData[1].marker._colorAx).toBe(fullLayout.coloraxis);
+            expect(fullData[2]._colorAx).toBe(fullLayout.coloraxis3);
+
+            expect(fullLayout.coloraxis).not.toBe(undefined);
+            expect(fullLayout.coloraxis2).toBe(undefined);
+            expect(fullLayout.coloraxis3).not.toBe(undefined);
+            expect(fullLayout.coloraxis4).toBe(undefined);
+
+            expect(Object.keys(fullLayout._colorAxes)).toEqual(['coloraxis', 'coloraxis3']);
+            expect(fullLayout._colorAxes.coloraxis[0]).toBe('heatmap');
+            expect(fullLayout._colorAxes.coloraxis3[0]).toBe('fill');
+        });
+
+        it('should log warning when trying to shared color axis with traces with incompatible color bars', function() {
+            spyOn(Lib, 'warn');
+
+            var gd = _supply([
+                // ok
+                {type: 'heatmap', z: [[1]], coloraxis: 'coloraxis'},
+                {y: [1], marker: {color: [1], coloraxis: 'coloraxis'}},
+                {type: 'contour', z: [[1]], contours: {coloring: 'heatmap'}, coloraxis: 'coloraxis'},
+                // invalid (coloring dflt is 'fill')
+                {type: 'heatmap', z: [[1]], coloraxis: 'coloraxis2'},
+                {type: 'contour', z: [[1]], coloraxis: 'coloraxis2'},
+                // invalid
+                {type: 'contour', z: [[1]], contours: {coloring: 'lines'}, coloraxis: 'coloraxis3'},
+                {type: 'contour', z: [[1]], contours: {coloring: 'heatmap'}, coloraxis: 'coloraxis3'},
+                // ok
+                {type: 'contour', z: [[1]], coloraxis: 'coloraxis4'},
+                {type: 'contour', z: [[1]], coloraxis: 'coloraxis4'},
+                // ok
+                {type: 'contour', z: [[1]], contours: {coloring: 'lines'}, coloraxis: 'coloraxis5'},
+                {type: 'contour', z: [[1]], contours: {coloring: 'lines'}, coloraxis: 'coloraxis5'}
+            ]);
+
+            var fullData = gd._fullData;
+            var fullLayout = gd._fullLayout;
+
+            expect(Object.keys(fullLayout._colorAxes)).toEqual(['coloraxis', 'coloraxis4', 'coloraxis5']);
+            expect(fullLayout._colorAxes.coloraxis[0]).toBe('heatmap');
+            expect(fullLayout._colorAxes.coloraxis4[0]).toBe('fill');
+            expect(fullLayout._colorAxes.coloraxis5[0]).toBe('lines');
+            expect(Lib.warn).toHaveBeenCalledTimes(2);
+
+            var zAttrs = ['zauto', 'colorscale', 'reversescale'];
+            var withColorAx = [0, 1, 2, 7, 8, 9, 10];
+            var woColorAx = [3, 4, 5, 6];
+            zAttrs.forEach(function(attr) {
+                withColorAx.forEach(function(i) {
+                    expect(fullData[i][attr]).toBe(undefined, 'trace ' + i + ' ' + attr);
+                });
+                woColorAx.forEach(function(i) {
+                    expect(fullData[i][attr]).not.toBe(undefined, 'trace ' + i + ' ' + attr);
+                });
+            });
+        });
+    });
+
     describe('calc', function() {
         var calcColorscale = Colorscale.calc;
         var trace, z;
@@ -520,6 +632,27 @@ describe('Test colorscale:', function() {
             expect(trace.autocolorscale).toBe(true);
             expect(trace.colorscale).toEqual(colorscale);
         });
+
+        it('should compute min/max across trace linked to same color axis', function() {
+            gd = _supply([
+                {type: 'heatmap', z: [[1, 3, 4], [2, 3, 1]], coloraxis: 'coloraxis'},
+                {y: [1, 3, 1], marker: {color: [3, 4, -2], coloraxis: 'coloraxis'}},
+            ]);
+
+            Plots.doCalcdata(gd);
+
+            var fullData = gd._fullData;
+            expect(fullData[0].zmin).toBe(undefined);
+            expect(fullData[0].zmax).toBe(undefined);
+            expect(fullData[1].marker.cmin).toBe(undefined);
+            expect(fullData[1].marker.cmax).toBe(undefined);
+
+            var fullLayout = gd._fullLayout;
+            expect(fullLayout.coloraxis.cmin).toBe(-2);
+            expect(fullLayout.coloraxis._cmin).toBe(-2);
+            expect(fullLayout.coloraxis.cmax).toBe(4);
+            expect(fullLayout.coloraxis._cmax).toBe(4);
+        });
     });
 
     describe('extractScale + makeColorScaleFunc', function() {
@@ -535,11 +668,11 @@ describe('Test colorscale:', function() {
         it('should constrain color array values between cmin and cmax', function() {
             var trace = {
                 colorscale: scale,
-                pmin: 2,
-                pmax: 3
+                cmin: 2,
+                cmax: 3
             };
 
-            var specs = Colorscale.extractScale(trace, {cLetter: 'p'});
+            var specs = Colorscale.extractScale(trace);
             var sclFunc = Colorscale.makeColorScaleFunc(specs);
 
             var color1 = sclFunc(1);
@@ -557,11 +690,11 @@ describe('Test colorscale:', function() {
             var trace = {
                 colorscale: scale,
                 reversescale: true,
-                pmin: 2,
-                pmax: 3
+                zmin: 2,
+                zmax: 3
             };
 
-            var specs = Colorscale.extractScale(trace, {cLetter: 'p'});
+            var specs = Colorscale.extractScale(trace);
             var sclFunc = Colorscale.makeColorScaleFunc(specs);
 
             var color1 = sclFunc(1);
@@ -574,6 +707,29 @@ describe('Test colorscale:', function() {
             expect(color3).toEqual(color4);
             expect(color4).toEqual('rgb(5, 10, 172)');
         });
+
+        it('should extract coloraxis options, if present', function() {
+            var trace = {
+                _colorAx: {
+                    colorscale: scale,
+                    cmin: 2,
+                    cmax: 3
+                }
+            };
+
+            var specs = Colorscale.extractScale(trace);
+            var sclFunc = Colorscale.makeColorScaleFunc(specs);
+
+            var color1 = sclFunc(1);
+            var color2 = sclFunc(2);
+            var color3 = sclFunc(3);
+            var color4 = sclFunc(4);
+
+            expect(color1).toEqual(color2);
+            expect(color1).toEqual('rgb(5, 10, 172)');
+            expect(color3).toEqual(color4);
+            expect(color4).toEqual('rgb(178, 10, 28)');
+        });
     });
 });
 
@@ -865,6 +1021,86 @@ describe('Test colorscale restyle calls:', function() {
         .then(done);
     });
 
+    it('should be able to toggle between autocolorscale true/false and set colorscales (coloraxis case)', function(done) {
+        function _assert(msg, exp) {
+            var mcc = [];
+            d3.selectAll('path.point').each(function() { mcc.push(getFill(this)); });
+            expect(mcc).toEqual(exp.mcc);
+
+            expect(gd._fullLayout.coloraxis.colorscale).toEqual(exp.colorscale);
+            expect(gd._fullLayout.coloraxis.autocolorscale).toBe(exp.autocolorscale, msg);
+            expect((gd.layout.coloraxis || {}).colorscale).toEqual(exp.colorscaleIn);
+            expect((gd.layout.coloraxis || {}).autocolorscale).toBe(exp.autocolorscaleIn, msg);
+        }
+
+        // update via, assert then assert again (and again ;) after non-calc edits
+        function _run(msg, updateObj, exp) {
+            return Plotly.relayout(gd, updateObj)
+                .then(function() { _assert(msg, exp); })
+                .then(function() { return Plotly.relayout(gd, 'xaxis.range', [-1, 5]); })
+                .then(function() { _assert(msg + ' after axrange relayout', exp); })
+                .then(function() { return Plotly.relayout(gd, 'xaxis.autorange', true); })
+                .then(function() { _assert(msg + ' after autorange', exp); })
+                .then(function() { return Plotly.restyle(gd, 'marker.symbol', 'square'); })
+                .then(function() { _assert(msg + ' after marker.symbol restyle', exp); })
+                .then(function() { return Plotly.restyle(gd, 'marker.symbol', null); })
+                .then(function() { _assert(msg + ' back to original marker.symbol', exp); });
+        }
+
+        var rdbu = ['rgb(5, 10, 172)', 'rgb(53, 70, 208)', 'rgb(227, 153, 104)',
+            'rgb(53, 70, 208)', 'rgb(53, 70, 208)', 'rgb(178, 10, 28)'];
+        var grns = ['rgb(0, 68, 27)', 'rgb(12, 119, 52)', 'rgb(174, 222, 167)',
+            'rgb(12, 119, 52)', 'rgb(12, 119, 52)', 'rgb(247, 252, 245)'];
+
+        Plotly.plot(gd, [{
+            mode: 'markers',
+            y: [1, 2, 3],
+            marker: {color: [-1, 0, 3], coloraxis: 'coloraxis'}
+        }, {
+            mode: 'markers',
+            y: [2, 3, 4],
+            marker: {color: [0, 0, 5], coloraxis: 'coloraxis'}
+        }])
+        .then(function() {
+            _assert('base (autocolorscale:true by dflt)', {
+                mcc: rdbu,
+                autocolorscale: true,
+                autocolorscaleIn: undefined,
+                colorscale: Colorscale.scales.RdBu,
+                colorscaleIn: undefined
+            });
+        })
+        .then(function() {
+            return _run('set *Greens* colorscale', {'coloraxis.colorscale': 'Greens'}, {
+                mcc: grns,
+                autocolorscale: false,
+                autocolorscaleIn: false,
+                colorscale: Colorscale.scales.Greens,
+                colorscaleIn: 'Greens'
+            });
+        })
+        .then(function() {
+            return _run('back to autocolorscale:true', {'coloraxis.autocolorscale': true}, {
+                mcc: rdbu,
+                autocolorscale: true,
+                autocolorscaleIn: true,
+                colorscale: Colorscale.scales.RdBu,
+                colorscaleIn: 'Greens'
+            });
+        })
+        .then(function() {
+            return _run('back to autocolorscale:false w/ colorscale set', {'coloraxis.autocolorscale': false}, {
+                mcc: grns,
+                autocolorscale: false,
+                autocolorscaleIn: false,
+                colorscale: Colorscale.scales.Greens,
+                colorscaleIn: 'Greens'
+            });
+        })
+        .catch(failTest)
+        .then(done);
+    });
+
     it('should work with templates', function(done) {
         function _assert(msg, exp) {
             var mcc = [];
@@ -910,11 +1146,14 @@ describe('Test colorscale restyle calls:', function() {
             x: [1, 2, 3],
             y: [1, 2, 3],
             z: [1, 2, 1],
-            marker: {color: [1, 2, 1], showscale: true}
+            marker: {color: [1, 2, 1], showscale: true},
+            line: {color: [2, 3, 4], showscale: true}
         }])
         .then(function() {
             expect(gd._fullData[0].marker.cmin).toBe(1);
             expect(gd._fullData[0].marker.cmax).toBe(2);
+            expect(gd._fullData[0].line.cmin).toBe(2);
+            expect(gd._fullData[0].line.cmax).toBe(4);
         })
         .then(function() {
             // some non-calc edit
@@ -923,6 +1162,8 @@ describe('Test colorscale restyle calls:', function() {
         .then(function() {
             expect(gd._fullData[0].marker.cmin).toBe(1);
             expect(gd._fullData[0].marker.cmax).toBe(2);
+            expect(gd._fullData[0].line.cmin).toBe(2);
+            expect(gd._fullData[0].line.cmax).toBe(4);
         })
         .catch(failTest)
         .then(done);