diff --git a/packages/onsite-toolkit/frontend/resolver.page..tsx b/packages/onsite-toolkit/frontend/resolver.page..tsx
new file mode 100644
index 000000000..3affec267
--- /dev/null
+++ b/packages/onsite-toolkit/frontend/resolver.page..tsx
@@ -0,0 +1,280 @@
+/* eslint-disable no-await-in-loop */
+import { animated, easings, useSprings } from '@react-spring/web';
+import useKey from 'react-use/lib/useKey';
+import {
+  addPage, NamedPage, React, ReactDOM,
+} from '@hydrooj/ui-default';
+import { ResolverInput } from '../interface';
+
+async function scrollTo(offset) {
+  const fixedOffset = offset.toFixed();
+  await new Promise((resolve) => {
+    const onScroll = function () {
+      if (window.pageYOffset.toFixed() === fixedOffset) {
+        window.removeEventListener('scroll', onScroll);
+        resolve(null);
+      }
+    };
+
+    window.addEventListener('scroll', onScroll);
+    onScroll();
+    window.scrollTo({
+      top: offset,
+      behavior: 'smooth',
+    });
+  });
+}
+export interface DisplaySettings {
+  showAvatar: boolean;
+  showSchool: boolean;
+}
+
+interface Props extends DisplaySettings {
+  data: ResolverInput;
+}
+
+function status(problem) {
+  if (!problem) return 'untouched';
+  if (problem.pass) return 'ac';
+  if (!problem.old && !problem.frozen) return 'untouched';
+  if (problem.frozen) return 'frozen';
+  return 'failed';
+}
+
+function submissions(problem) {
+  const st = status(problem);
+  if (st === 'ac') { return `${problem.old}`; }
+  if (st === 'frozen') { return `${problem.old}+${problem.frozen}`; }
+  if (st === 'failed') { return problem.old; }
+  return String.fromCharCode('A'.charCodeAt(0) + problem.index);
+}
+
+export function start(data: ResolverInput, options: DisplaySettings) {
+  $('title').text(`${data.name} - Resolver`);
+  $('.header .title').text(`${data.name}`);
+  const teams = data.teams.map((v) => ({
+    id: v.id,
+    rank: 0,
+    score: 0,
+    penalty: 0,
+    ranked: !v.exclude,
+    total: 0,
+    problems: data.problems.map((problem, idx) => ({
+      old: 0,
+      frozen: 0,
+      pass: false,
+      id: problem.id,
+      index: idx,
+    })),
+  }));
+  const allSubmissions = data.submissions.sort((a, b) => a.time - b.time);
+  const allAc = allSubmissions.filter((i) => i.verdict === 'AC');
+  for (const submission of allSubmissions) {
+    const team = teams.find((v) => v.id === submission.team);
+    if (!team) continue;
+    const isFrozen = submission.time > data.frozen;
+    const problem = team.problems.find((i) => i.id === submission.problem);
+    if (!problem || problem.pass) continue;
+    team.total++;
+    if (isFrozen) problem.frozen += 1;
+    else {
+      if (submission.verdict === 'AC') {
+        problem.pass = true;
+        team.score += 1;
+        team.penalty += submission.time + problem.old * 20 * 60;
+      }
+      problem.old += 1;
+    }
+  }
+
+  function MainList(props: Props) {
+    const [selectedTeam, setTeam] = React.useState('');
+    const [selectedProblem, setP] = React.useState<string | null>(null);
+    const [executeIdx, setExecuteIdx] = React.useState(0);
+    const [, setRenderC] = React.useState(0);
+
+    function processRank(source = teams) {
+      const clone = [...source];
+      clone.sort((a, b) => b.score - a.score || a.penalty - b.penalty || b.total - a.total);
+      let rank = 1;
+      for (const team of clone) {
+        if (team.ranked) {
+          team.rank = rank;
+          rank++;
+        } else {
+          team.rank = -1;
+        }
+      }
+      return clone.map((i) => source.indexOf(i));
+    }
+
+    const order = React.useRef(processRank());
+
+    const [springs, api] = useSprings(teams.length, (index) => ({
+      y: order.current.indexOf(index) * 80 - index * 80,
+      scale: 1,
+      zIndex: 0,
+      shadow: 1,
+      immediate: (key: string) => key === 'y' || key === 'zIndex',
+    }));
+
+    const operations = {
+      async highlightTeam(teamId: string, scrollIdx: number) {
+        setP(null);
+        setTeam(teamId);
+        await scrollTo(scrollIdx * 80 - window.innerHeight + 241 + 40);
+      },
+      async highlightProblem(problemId: string) {
+        setP(problemId);
+      },
+      async revealProblem(teamId: string, problemId: string) {
+        const team = teams.find((i) => i.id === teamId);
+        const problem = team?.problems.find((i) => i.id === problemId);
+        if (!team || !problem) return;
+        if (allAc.find((s) => s.team === teamId && s.problem === problemId)) {
+          const sub = allSubmissions.filter((s) => s.team === teamId && s.problem === problemId);
+          let penalty = 0;
+          for (const s of sub) {
+            if (s.verdict !== 'AC') {
+              penalty += 20 * 60;
+              problem.old++;
+            } else {
+              penalty += s.time;
+              break;
+            }
+          }
+          team.penalty += penalty;
+          team.score += 1;
+          problem.pass = true;
+          problem.frozen = 0;
+        } else {
+          problem.old += problem.frozen;
+          problem.frozen = 0;
+        }
+        setP(null);
+      },
+      async updateRank() {
+        order.current = processRank();
+        api.start((index) => ({
+          y: order.current.indexOf(index) * 80 - index * 80,
+          scale: 1,
+          zIndex: 0,
+          shadow: 1,
+          config: {
+            easing: easings.steps(5),
+          },
+        }));
+      },
+    };
+
+    const calculated = React.useMemo(() => {
+      window.scrollTo(0, document.body.scrollHeight);
+      const clone = JSON.parse(JSON.stringify(teams));
+      const ops: { name: string, args: any[] }[] = [];
+      function queueOperations(name: string, ...args: any[]) {
+        ops.push({ name, args });
+      }
+      let orders = processRank(clone);
+      for (let i = clone.length - 1; i > 0; i--) {
+        const team = clone[orders[i]];
+        queueOperations('highlightTeam', team.id, i);
+        for (const pinfo of data.problems) {
+          const problem = team.problems.find((idx) => idx.id === pinfo.id);
+          if (!problem || !problem.frozen || problem.pass) continue;
+          queueOperations('highlightProblem', pinfo.id);
+          queueOperations('revealProblem', team.id, pinfo.id);
+          // scroll to selected line
+          if (allAc.find((s) => s.team === team.id && s.problem === problem.id)) {
+            const sub = allSubmissions.filter((s) => s.team === team.id && s.problem === problem.id);
+            let penalty = 0;
+            for (const s of sub) {
+              if (s.verdict !== 'AC') {
+                penalty += 20 * 60;
+                problem.old++;
+              } else {
+                penalty += s.time;
+                break;
+              }
+            }
+            team.penalty += penalty;
+            team.score += 1;
+            problem.pass = true;
+            problem.frozen = 0;
+            queueOperations('updateRank');
+            const oldOrder = JSON.stringify(orders);
+            orders = processRank(clone);
+            if (oldOrder !== JSON.stringify(orders)) {
+              i++;
+              break;
+            }
+          } else {
+            problem.old += problem.frozen;
+            problem.frozen = 0;
+          }
+        }
+      }
+      return ops;
+    }, [data]);
+
+    useKey('n', async () => {
+      const op = calculated[executeIdx];
+      if (!op) return;
+      setExecuteIdx(executeIdx + 1);
+      await operations[op.name](...op.args);
+      setRenderC((i) => i + 1);
+    }, {}, [executeIdx, calculated]);
+
+    return (<>
+      {springs.map(({
+        zIndex, y,
+      }, i) => {
+        const team = teams[i];
+        const teamInfo = data.teams.find((idx) => idx.id === team.id);
+        if (!teams[i]) return <animated.div key={i}>Team {i} not found</animated.div>;
+        if (!teamInfo) return <animated.div key={i}>Team info for id {team.id} not found</animated.div>;
+        return <animated.div
+          key={i}
+          className="rank-list-item clearfix"
+          style={{
+            zIndex,
+            // boxShadow: shadow.to((s) => `rgba(0, 0, 0, 0.15) 0px ${s}px ${2 * s}px 0px`),
+            y,
+            ...(selectedTeam === team.id ? {
+              backgroundColor: '#406b82',
+            } : {
+              background: 'transparent',
+            }),
+          }}
+          children={<>
+            <div className="rank">{team.rank === -1 ? '*' : team.rank}</div>
+            {props.showAvatar && <img className="avatar" src={`${teamInfo?.avatar}`} />}
+            <div className="content">
+              <div className="name">
+                {props.showSchool ? `${teamInfo.institution} - ` : ''}{teamInfo.name}
+              </div>
+              <div className="problems">
+                {data.problems.map((v) => {
+                  const uncover = team.id === selectedTeam && selectedProblem === v.id;
+                  const problemStatus = team.problems.find((idx) => idx.id === v.id);
+                  return <span key={v.id} className={`${status(problemStatus)} ${uncover ? 'uncover' : ''} item`}>
+                    {submissions(problemStatus)}
+                  </span>;
+                })}
+              </div>
+            </div>
+            <div className="solved">{team.score}</div>
+            <div className="penalty">{Math.floor(team.penalty / 60)}</div>
+          </>}
+        />;
+      })}
+    </>);
+  }
+  ReactDOM.createRoot(document.getElementById('rank-list')!).render(<MainList {...options} data={data} />);
+}
+
+addPage(new NamedPage(['resolver'], () => {
+  start(UiContext.payload, {
+    showAvatar: true,
+    showSchool: true,
+  });
+}));
diff --git a/packages/onsite-toolkit/index.ts b/packages/onsite-toolkit/index.ts
index 0e0fc30ce..006848cbb 100644
--- a/packages/onsite-toolkit/index.ts
+++ b/packages/onsite-toolkit/index.ts
@@ -1,6 +1,8 @@
 import {
-    Context, db, ForbiddenError, UserModel,
+    avatar, ContestModel, Context, db, ForbiddenError,
+    ObjectId, PERM, STATUS, Time, UserModel,
 } from 'hydrooj';
+import { ResolverInput } from './interface';
 
 interface IpLoginInfo {
     _id: string;
@@ -33,4 +35,45 @@ export function apply(ctx: Context) {
             that.session.user = that.user;
         }
     });
+
+    ctx.inject(['scoreboard'], ({ scoreboard }) => {
+        scoreboard.addView('resolver-tiny', 'Resolver(Tiny)', { tdoc: 'tdoc' }, {
+            async display({ tdoc }) {
+                if (!this.user.own(tdoc)) this.checkPerm(PERM.PERM_VIEW_CONTEST_HIDDEN_SCOREBOARD);
+                const teams = await ContestModel.getMultiStatus(tdoc.domainId, { docId: tdoc.docId }).toArray();
+                const udict = await UserModel.getList(tdoc.domainId, teams.map((i) => i.uid));
+                const teamIds: Record<number, number> = {};
+                for (let i = 1; i <= teams.length; i++) teamIds[teams[i - 1].uid] = i;
+                const time = (t: ObjectId) => Math.floor((t.getTimestamp().getTime() - tdoc.beginAt.getTime()) / Time.second);
+                const pid = (i: number) => String.fromCharCode(65 + i);
+                const unknownSchool = this.translate('Unknown School');
+                const submissions = teams.flatMap((i) => {
+                    if (!i.journal) return [];
+                    return i.journal.filter((s) => tdoc.pids.includes(s.pid)).map((s) => ({ ...s, uid: i.uid }));
+                });
+                this.response.body = {
+                    payload: {
+                        name: tdoc.title,
+                        duration: Math.floor((new Date(tdoc.endAt).getTime() - new Date(tdoc.beginAt).getTime()) / 1000),
+                        frozen: Math.floor((new Date(tdoc.endAt).getTime() - new Date(tdoc.lockAt).getTime()) / 1000),
+                        problems: tdoc.pids.map((i, n) => ({ name: pid(n), id: i.toString() })),
+                        teams: teams.map((t) => ({
+                            id: t.uid.toString(),
+                            name: udict[t.uid].uname,
+                            avatar: avatar(udict[t.uid].avatar),
+                            institution: udict[t.uid].school || unknownSchool,
+                        })),
+                        submissions: submissions.map((i) => ({
+                            team: i.uid.toString(),
+                            problem: i.pid.toString(),
+                            verdict: i.status === STATUS.STATUS_ACCEPTED ? 'AC' : 'RJ',
+                            time: time(i.rid),
+                        })),
+                    } as ResolverInput,
+                };
+                this.response.template = 'resolver.html';
+            },
+            supportedRules: ['acm'],
+        });
+    });
 }
diff --git a/packages/onsite-toolkit/interface.ts b/packages/onsite-toolkit/interface.ts
new file mode 100644
index 000000000..d7f02dc85
--- /dev/null
+++ b/packages/onsite-toolkit/interface.ts
@@ -0,0 +1,33 @@
+type Verdict = 'RJ' | 'AC' | 'NA';
+export interface ProblemInfo {
+    color?: string; // hex color
+    id: string;
+    name: string; // A, B, C, ...
+}
+export interface TeamInfo {
+    id: string;
+    name: string;
+    avatar?: string;
+    institution?: string;
+    exclude?: boolean; // false by default
+}
+export interface InstitiutionInfo {
+    id: string;
+    name: string;
+    avatar?: string;
+}
+export interface SubmissionInfo {
+    team: string;
+    problem: string;
+    verdict: Verdict;
+    time: number; // in seconds
+}
+export interface ResolverInput {
+    name: string;
+    duration: number; // in seconds
+    frozen: number; // in seconds
+    problems: ProblemInfo[];
+    submissions: SubmissionInfo[];
+    teams: TeamInfo[];
+    institutions: Record<string, InstitiutionInfo>;
+}
diff --git a/packages/onsite-toolkit/package.json b/packages/onsite-toolkit/package.json
index d1ccd0de0..18dbe74ef 100644
--- a/packages/onsite-toolkit/package.json
+++ b/packages/onsite-toolkit/package.json
@@ -1,4 +1,8 @@
 {
     "name": "@hydrooj/onsite-toolkit",
-    "version": "0.0.1"
+    "version": "0.0.1",
+    "dependencies": {
+        "@react-spring/web": "^9.7.3",
+        "react-use": "^17.4.2"
+    }
 }
diff --git a/packages/onsite-toolkit/public/resolver.css b/packages/onsite-toolkit/public/resolver.css
new file mode 100644
index 000000000..d324d43b8
--- /dev/null
+++ b/packages/onsite-toolkit/public/resolver.css
@@ -0,0 +1,110 @@
+body {
+    color: #eee;
+    background-color: #121212;
+}
+.rank-list {
+    background: repeating-linear-gradient(
+      180deg,
+      #3e3e3e 0px,
+      #3e3e3e 80px,
+      #121212 80px,
+      #121212 160px
+    );
+}
+.rank-list-item {
+    padding: 10px 0;
+    height: 80px;
+    position: relative;
+    background: transparent;
+    display: flex;
+    align-items: center;
+    vertical-align: middle;
+}
+.header {
+    display: flex;
+    align-items: center;
+    padding: 10px 0;
+    height: 40px;
+}
+.header .rank, .header .solved, .header .penalty {
+    width: 90px;
+    font-size: 20px;
+    text-align: center;
+}
+.header .content {
+    flex-grow: 1;
+    text-align: left;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+}
+.header .content .title {
+    flex-grow: 1;
+    font-size: 20px;
+    text-align: left;
+    display: flex;
+}
+.header .content .copyright {
+    color: #8a919b;
+    font-size: 15px;
+}
+.rank-list-item .rank, .rank-list-item .solved, .rank-list-item .penalty {
+    padding: 10px 0px;
+    width: 90px;
+    font-size: 40px;
+    text-align: center;
+    vertical-align: middle;
+}
+.rank-list-item .avatar {
+    height: 60px;
+    width: 60px;
+    border-radius: 5px;
+    margin-right: 15px;
+}
+.rank-list-item .content {
+    flex-grow: 1;
+    height: 60px
+}
+.rank-list-item .content .name {
+    font-size: 30px;
+    margin-bottom: 6px;
+}
+.rank-list-item .content .problems {
+    display: flex;
+    align-items: center;
+    gap: 5px;
+}
+.rank-list-item .problems .item {
+    padding: 2px;
+    width: 95px;
+    text-align: center;
+    border-radius: 5px;
+    font-size: 20px;
+}
+.ac {
+    background-color: #009c00;
+}
+.failed, .WA {
+    background-color: #dd514c;
+}
+.frozen {
+    background-color: #3c6ef6;
+}
+.untouched {
+    background-color: #282828;
+    color: #8a919b;
+}
+.uncover {
+    animation: flashing 1000ms infinite;
+    -webkit-animation: flashing 1000ms infinite; /*Safari and Chrome*/
+}
+@keyframes flashing {
+    from { background-color: #3c6ef6 }
+    50% { background-color: #7699ea }
+    to { background-color: #3c6ef6 }
+}
+@-webkit-keyframes flashing {/*Safari and Chrome*/
+    from { background-color: #3c6ef6 }
+    50% { background-color: #7699ea }
+    to { background-color: #3c6ef6 }
+}
\ No newline at end of file
diff --git a/packages/onsite-toolkit/templates/resolver.html b/packages/onsite-toolkit/templates/resolver.html
new file mode 100644
index 000000000..9a0c437ec
--- /dev/null
+++ b/packages/onsite-toolkit/templates/resolver.html
@@ -0,0 +1,15 @@
+{% extends "layout/html5.html" %}
+{% block body %}
+{{ set(UiContext, 'payload', payload) }}
+<header class="header">
+  <span class="rank">#Rank</span>
+  <span class="content">
+    <span class="title">Contest</span>
+    <span class="copyright">@Hydro/TinyResolver</span>
+  </span>
+  <span class="solved">Solved</span>
+  <span class="penalty">Penalty</span>
+</header>
+<div class="rank-list" id="rank-list"></div>
+<link rel="stylesheet" href="/resolver.css?_={{ Date.now() }}" />
+{% endblock %}
diff --git a/packages/ui-default/backendlib/builder.ts b/packages/ui-default/backendlib/builder.ts
index 23fe6b739..d85b9b5d7 100644
--- a/packages/ui-default/backendlib/builder.ts
+++ b/packages/ui-default/backendlib/builder.ts
@@ -29,14 +29,33 @@ const tmp = tmpdir();
 const federationPlugin: esbuild.Plugin = {
   name: 'federation',
   setup(b) {
+    const packages = {
+      react: 'React',
+      'react-dom': 'ReactDOM',
+      jquery: '$',
+    };
     b.onResolve({ filter: /^@hydrooj\/ui-default/ }, () => ({
       path: 'api',
       namespace: 'ui-default',
     }));
-    b.onLoad({ filter: /.*/, namespace: 'ui-default' }, () => ({
-      contents: 'module.exports = window.HydroExports;',
-      loader: 'tsx',
-    }));
+    for (const key in packages) {
+      b.onResolve({ filter: new RegExp(`^${key}($|\\/)`) }, () => ({
+        path: packages[key],
+        namespace: 'ui-default',
+      }));
+    }
+    b.onLoad({ filter: /.*/, namespace: 'ui-default' }, (args) => {
+      if (args.path === 'api') {
+        return {
+          contents: 'module.exports = window.HydroExports;',
+          loader: 'tsx',
+        };
+      }
+      return {
+        contents: `module.exports = window.HydroExports['${args.path}'];`,
+        loader: 'tsx',
+      };
+    });
   },
 };