Capture Japanese words the moment you hear them — and never forget them.
A single-user app I built to learn Japanese while living in Japan: fast AI-assisted capture, the memory of where each word came from, and spaced-repetition review.
It’s a private, single-account app (email allowlist) — this page is the tour.
Capture 取り込む
Type a word; Jisho + Gemini auto-fill the reading, Indonesian & English meanings, and an example. Tag where you heard it.
Browse 一覧
Every word as a table or bento grid, with furigana. Filter by source, mastery, or what’s due. Tap for full detail.
Practice 復習
SM-2 spaced-repetition flashcards. Flip, rate forgot / hard / easy, and the app schedules the next review.
See it in action
Capture · AI auto-fill
How it’s built
A full-stack PWA on entirely free tiers. Words are auto-enriched by a Jisho → Gemini fallback pipeline, review scheduling uses a hand-implemented SM-2 algorithm, and every row is protected by Postgres row-level security with a single-user Google OAuth allowlist.