Stable signalNo paid features detectedMedium-risk permissions

Mouse Dictionary

A super fast dictionary for language learners

Users100KCurrent public install base

Rating4.7Store average score

Reviews116Public review volume

Manifest versionV3Extension platform version

7-day growth0Net users gained this week

7-day growth rate0%Relative weekly velocity

Preview

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2 assets

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Start

4.73

Latest

4.73

7-day rating change

0.00

2026年7月13日2026年7月19日

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Technical snapshot

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Version1.7.1

ManifestV3

Size3.76MiB

Languages2English / 日本語

Published--

Store updated--

Last crawled--

Overview

Product summary

Review the store description, core capabilities, and common use cases.

Mouse Dictionary is a super fast dictionary for Google Chrome.

Designed mainly for English and Japanese.

Features:

* Super fast!!!

* Awesome phrases detection

* Capable of importing your own text data

Reviews

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Store average score4.7Chrome Web Store aggregate rating, including ratings without synced review text

Synced text average4.7Average computed only from synced review bodies below

Reviews with text71Synced review bodies

Total ratings / reviews116Chrome Web Store public rating/review count

Store average score: 4.7. The bars below are calculated from synced review text only, so they may be empty for extensions that have public ratings but no synced comments yet.

5★

4★

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1★

Shun M2026年2月10日

タッチパネルでのサイズ変更、移動に対応していただけるとありがたいです。（Chromebookをタブレットとして使用時）

Mikhail Fleitman2025年4月8日

Fast, but for JP-EN/EN-JP learners. EN-EN dict without IPA and word pronociation.

フェルナンドモモンソ2025年3月17日

非常に重宝しています。常に使っておりますので、サイトアクセスをすべてのサイトに設定できるようにしていただけると、ショートカットで毎回起動する必要がなく非常に助かりますので、検討していただけないでしょうか。

真実2025年2月2日

動画の字幕翻訳が早くて良いと聞いたのに翻訳されない。

田中克典2025年1月25日

とても良いです単語を保存する機能があるとうれしいです

yasu2024年10月27日

とても素晴らしい機能なのですが、最近発音ボタンを押しても再生されなくなってしまいました。 Chromeの再起動、パソコン本体を再起動、mouse dictionaryの設定を初期化、mouse dictionaryを一度アンインストールしてやり直す、など様々なことを試してみたのですが改善されませんでした。発音再生機能がとても便利でしたので、改善法がありましたら教えていただけますと幸いです。

Ananya Gupta2024年10月1日

This is an English-Japanese translation dictionary and not a general English dictionary. Should have been directly clear in the title and description.

Yusuke Ikemi2024年9月23日

amazing fast response, local and customizable. I mean this is the only way of breaking language barrier without hullsination.

8712024年9月16日

Uh, not the cleanest looking little thing. If you wanna use a pop-up dictionary to learn jp, just use yomitan. Are there any en-cn dictionaries for this thing?

Basil2024年6月6日

hello if u are reading this, bro i love ur extension so much, but i also want wikipedia results when hover over, Please, so i have been trying to integrate wiki API but i dont know much about programming so i couldnt do it. please reply if u see this. I LOVE YOU

Showing 71 results

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AI product read

Mouse-hover dictionary extension for Chrome that shows instant word definitions when hovering over text

Eliminates the need for language learners (especially English-Japanese) to manually look up words in a separate dictionary application, providing instant inline translations

User installs the extension and activates it by clicking the extension icon. When browsing any web page (including PDFs and YouTube), hovering the mouse over a word instantly displays a popup with the word's definition from the built-in English-Japanese dictionary. The popup shows the headword, pronunciation button, and full definition. Users can customize the popup appearance, import additional dictionaries, and use keyboard shortcuts to scroll through definitions. The extension operates entirely locally with no external API calls needed.

Target users: English language learners studying Japanese / Japanese language learners studying English / Language students reading web content in their target language / Researchers reading foreign-language documents

All source code is minified/bundled, making individual feature attribution difficult, though the overall architecture is clear
Dictionary data files are very large (several MB each) making exhaustive inspection impractical, but they consistently contain dictionary entries rather than code
The options/options.js file is 908KB of minified code containing bundled React and Ace editor libraries, making it hard to distinguish extension-specific code from library code

Monetization

No paid features detected

No payment platform integrations, no freemium gating, no upgrade prompts, no subscription model found. All keyword hits for 'pro' were from CSS font names (e.g., 'hiragino kaku gothic pro'), minified code variable names, or dictionary data entries. 'Premium' hits were solely from English-Japanese dictionary entries defining the word 'premium'. The extension is open-source on GitHub (github.com/wtetsu/mouse-dictionary) and appears completely free. No Stripe, payment, billing, subscription, or purchase code exists anywhere.

Confidence: 95
Payment platform: --
Source: AI / High
Login required: No
Reason: No login UI, authentication code, OAuth flows, or credential management found anywhere in the extension. All keyword hits for 'login', 'account', 'signin', 'session', 'token' were false positives from dictionary data files (Japanese-English dictionary entries containing these English words as headwords). The extension operates entirely offline using bundled dictionary JSON files and Chrome local storage for settings. No API calls requiring authentication were found.

Permission risk

Medium-risk permissions

This estimate uses declared permissions and host permissions to assess access scope and sensitivity.

扩展能力较强：storage、activeTab、scripting

Publisher

Tetsu

Independent publisher

Email: [email protected]
Phone: --
Address: --

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Mouse Dictionary

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