Adaptive Furigana — JLPT-aware Japanese reading aid

Adaptive Furigana is a Chrome browser extension for people learning Japanese. The free version adds furigana to the kanji on any page so you can read anything. Upgrade to Pro and it adapts to you — readings appear only on kanji harder than your JLPT level (N5–N1), so the kanji you already know stay clean.

Features (free)

Pro upgrade — what we sell

Adaptive Furigana Pro — one-time purchase ($4.99)

A single, optional in-extension purchase unlocks a richer reading experience. It is a one-time payment, not a subscription:

Adaptive furigana — show readings only on kanji harder than your JLPT level (N5–N1); the kanji you already know stay clean
Full dictionary — every sense of a word, each tagged with its part of speech
Example sentences — real Japanese sentences with English translations
Read-aloud — hear the word pronounced (browser text-to-speech)

The free version stays fully functional forever — Pro removes the clutter and adds depth for serious learners. Payment is processed securely through ExtensionPay and Stripe; we never see your card details.

Privacy

This extension does not collect, store, or transmit any personal data. All processing happens locally in your browser. Read the full Privacy Policy.

Data sources & attribution

日本語

Adaptive Furigana は、日本語学習者向けの Chrome 拡張機能です。無料版はどんなページの漢字にもふりがなを付けて、何でも読めるようにします。 Pro にアップグレードすると、あなたの JLPT レベルより難しい漢字だけに読みを絞り込み、知っている漢字はそのままスッキリ表示できます。

本体は無料です。任意の買い切り「Pro」（一度きりの支払い・$4.99）を購入すると、レベル別にふりがなを出し分ける適応モード＋全語義・品詞・英訳付き例文・読み上げ（音声合成）が解放されます。支払いは ExtensionPay と Stripe を通じて安全に処理され、当方がカード情報を見ることはありません。詳しくはプライバシーポリシーをご覧ください。