diff --git a/packages/koishi-core/src/app.ts b/packages/koishi-core/src/app.ts
index 24c2e6b837..6a3a190c65 100644
--- a/packages/koishi-core/src/app.ts
+++ b/packages/koishi-core/src/app.ts
@@ -128,9 +128,8 @@ export class App extends Context {
     this.receiver.on('before-group', Command.attachGroupFields)
     this.middleware(this._preprocess)
 
-    this.receiver.on('logger', (scope, message) => {
-      debug('koishi:' + scope)(message)
-    })
+    // apply default logger
+    this.receiver.on('logger', (scope, message) => debug(scope)(message))
   }
 
   get users () {
@@ -236,7 +235,7 @@ export class App extends Context {
     }
     await Promise.all(tasks)
     this.status = Status.open
-    this.logger('app').debug('started')
+    this.logger('koishi:app').debug('started')
     this.receiver.emit('connect')
     if (this.selfId && !this._isReady) {
       this.receiver.emit('ready')
@@ -261,7 +260,7 @@ export class App extends Context {
       this.server.close()
     }
     this.status = Status.closed
-    this.logger('app').debug('stopped')
+    this.logger('koishi:app').debug('stopped')
     this.receiver.emit('disconnect')
     if (appList.every(app => app.status === Status.closed)) {
       onStopHooks.forEach(hook => hook(...appList))
@@ -270,7 +269,7 @@ export class App extends Context {
 
   emitEvent <K extends Events> (meta: Meta, event: K, ...payload: Parameters<EventMap[K]>) {
     if (!meta.$ctxType) {
-      this.logger('receiver').debug('/', 'emits', event)
+      this.logger('koishi:receiver').debug('/', 'emits', event)
       this.receiver.emit(event, ...payload)
       return
     }
@@ -278,7 +277,7 @@ export class App extends Context {
     for (const path in this._contexts) {
       const context = this._contexts[path]
       if (!context.match(meta)) continue
-      this.logger('receiver').debug(path, 'emits', event)
+      this.logger('koishi:receiver').debug(path, 'emits', event)
       context.receiver.emit(event, ...payload)
     }
   }
@@ -434,7 +433,7 @@ export class App extends Context {
     let index = 0
     const next = async (fallback?: NextFunction) => {
       if (!this._middlewareSet.has(counter)) {
-        return this.logger().warn(new Error(errors.ISOLATED_NEXT))
+        return this.logger('koishi').warn(new Error(errors.ISOLATED_NEXT))
       }
       if (fallback) middlewares.push((_, next) => fallback(next))
       try {
diff --git a/packages/koishi-core/src/command.ts b/packages/koishi-core/src/command.ts
index 9aafd0b810..a139ee5009 100644
--- a/packages/koishi-core/src/command.ts
+++ b/packages/koishi-core/src/command.ts
@@ -284,7 +284,7 @@ export class Command {
     if (code) return this._sendHint(code, meta)
 
     // execute command
-    this.context.logger('command').debug('execute %s', this.name)
+    this.context.logger('koishi:command').debug('execute %s', this.name)
     this.app.emitEvent(meta, 'command', argv)
 
     let skipped = false
diff --git a/packages/koishi-core/src/context.ts b/packages/koishi-core/src/context.ts
index 599b5c6090..024916dc9c 100644
--- a/packages/koishi-core/src/context.ts
+++ b/packages/koishi-core/src/context.ts
@@ -65,7 +65,7 @@ export class Context {
 
   constructor (public readonly identifier: string, private readonly _scope: ContextScope) {
     this.receiver.on('error', (error) => {
-      this.logger().warn(error)
+      this.logger('koishi').warn(error)
     })
 
     this.logger = (scope = '') => {
@@ -145,7 +145,7 @@ export class Context {
   middleware (middleware: Middleware) {
     const { maxMiddlewares } = this.app.options
     if (this.app._middlewares.length >= maxMiddlewares) {
-      this.logger().warn(new Error(format(errors.MAX_MIDDLEWARES, maxMiddlewares)))
+      this.logger('koishi').warn(new Error(format(errors.MAX_MIDDLEWARES, maxMiddlewares)))
     } else {
       this.app._middlewares.push([this, middleware])
     }
@@ -159,7 +159,7 @@ export class Context {
   prependMiddleware (middleware: Middleware) {
     const { maxMiddlewares } = this.app.options
     if (this.app._middlewares.length >= maxMiddlewares) {
-      this.logger().warn(new Error(format(errors.MAX_MIDDLEWARES, maxMiddlewares)))
+      this.logger('koishi').warn(new Error(format(errors.MAX_MIDDLEWARES, maxMiddlewares)))
     } else {
       this.app._middlewares.unshift([this, middleware])
     }
diff --git a/packages/koishi-core/src/sender.ts b/packages/koishi-core/src/sender.ts
index 9269bf9ade..45e642c718 100644
--- a/packages/koishi-core/src/sender.ts
+++ b/packages/koishi-core/src/sender.ts
@@ -70,9 +70,9 @@ export class Sender {
   }
 
   async get <T = any> (action: string, params: Record<string, any> = {}, silent = false): Promise<T> {
-    this.app.logger('sender').debug('request %s %o', action, params)
+    this.app.logger('koishi:sender').debug('request %s %o', action, params)
     const response = await this._get(action, snakeCase(params))
-    this.app.logger('sender').debug('response %o', response)
+    this.app.logger('koishi:sender').debug('response %o', response)
     const { data, retcode } = response
     if (retcode === 0 && !silent) {
       return camelCase(data)
diff --git a/packages/koishi-core/src/server.ts b/packages/koishi-core/src/server.ts
index 96d504eb58..799664a673 100644
--- a/packages/koishi-core/src/server.ts
+++ b/packages/koishi-core/src/server.ts
@@ -29,7 +29,7 @@ export abstract class Server {
   }
 
   protected debug (format: any, ...params: any[]) {
-    this.app?.logger('sender').debug(format, ...params)
+    this.app?.logger('koishi:sender').debug(format, ...params)
   }
 
   protected prepareMeta (data: any) {