Hover. That's it.
Move your pointer over the Japanese words — this is exactly how the app will feel.
● hover a word · click it to save a flashcard
What it does
Hover dictionary
Point at a word in almost any app — a floating panel shows kana and romaji readings, definitions and example sentences. Words with several readings get a pager.
Ambush review
Hover a word that's due for review and it quizzes you right there — answer hidden, reveal it, grade yourself. Spaced repetition without ever opening a review session.
Drag-to-OCR
Drag a rectangle over Japanese text in images, PDFs or videos. Recognition runs on-device via Apple Vision — no image ever leaves your Mac.
FSRS flashcards
Save any hovered word with one hotkey. Practice mode runs FSRS sessions with sentences and breakdowns on every card.
JLPT & 四字熟語 aware
Entries are tagged with JLPT level (N5–N1). Four-character idioms (四字熟語) are detected and marked so you can study them in context.
Works offline
No account, no server calls, no analytics. The dictionary and OCR both run locally, the popup answers in milliseconds, and idle CPU usage is zero.
Syncs with Koi JLPT
Send your deck to your iPhone, or run a full two-way sync of cards, FSRS schedule and review history with the Koi JLPT iOS app — straight from Settings.