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14日2026年7月20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

Recent review snapshot

Inspect the latest comments and rating distribution.

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★

3★

2★

1★

稲富英大2018年9月12日

超高速で大変快適です。ただ自分が通常使用している本文のフォントの大きさでは、辞書窓内のフォントが小さすぎて読めません。フォントの大きさを自由に設定できればなお快適なのですが。

oso san2018年9月10日

大変役立ちます。相当便利ただし、辞書データの削除に不具合？があるようで、1.5時間経過しても終了しませんでした。 ※i7-8700K 5.1Ghz /64GBメモリ/ M.2 970EVO 環境

辻田憲宏2018年9月6日

マウスオーバーだけで、超高速で英和辞書が使えるので、とても快適です。

Anonymous user2018年9月6日

感動しました

sim0n_p0rry2018年9月6日

とても使い勝手がいいです。

Rom Y2018年9月5日

複数形になるとサーチできないのが残念です。おっしゃる通り、英辞郎と組み合わせるといいですね。

Lio AKA2018年9月5日

手軽に素早く単語や熟語が調べられるのでとても便利です。

Natsuki Ito2018年9月5日

シンプルで良い感じです

Anonymous user2018年9月5日

Great! I'd like to set the font size :-)

tp52018年9月5日

良い

Showing 71 results

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Workflow & Planning

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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: --

Public contact fields are shown above. Developer portfolio pages are available on paid accounts.

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Mouse Dictionary

Mouse Dictionary Media preview

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Product summary

Recent review snapshot

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