Read an article. Watch a video. Pick up a manga. Hakkutsu helps you understand unfamiliar words and save them for review, right where you find them.
Install it and start reading. No registration or analytics tracking.
Dictionary, saved words, and review history live in your browser.
Send words, sentences, and media to your desktop decks through AnkiConnect.
Chromium
Firefox
AnkiConnect
Look up unknown vocabulary, mine context sentences, and schedule flashcards without breaking concentration.
Hover or select text on any webpage for readings, definitions, JLPT levels, pitch accents, and kanji stroke order diagrams. Clean furigana annotations above kanji help you read comfortably.
Interactive dual subtitles for YouTube and Netflix. Hover any subtitle word to pause and inspect definitions. The side-panel transcript lets you follow, search, and jump to any timestamp.
Read raw Japanese manga directly in your browser. Bundled Tesseract LSTM detects speech bubbles and vertical text on canvas without uploading images to any third-party server.
Capture the word, surrounding context sentence, source URL, screenshot, and audio to your vocabulary collection in one click. Configurable field mappings export cleanly to local Anki decks.
Review cards directly in browser with the DSR memory model (Difficulty, Stability, Retrievability). Includes Audio-First listening mode and Cloze Deletion context recall.
Export standard CSV for interoperability or full JSON backups preserving SRS scheduling state. Restore your collection anytime without resetting learning progress.
Built-in spaced repetition brings saved words back for review. Choose a retention target and practice with audio or sentences.
| Review tool | How you use it |
|---|---|
| FSRS scheduling | Reviews adapt to difficulty, stability, and retrievability. |
| Audio & sentence practice | Listen before revealing the word, or recall it from a gap in its original sentence. |
| Smart decks | Filter saved words by JLPT level, source, or words that need extra practice. |
| Portable collection | Export CSV or a full JSON backup, including your review history. |
Use the extension in any of eight interface languages.
