Koi Kioku

Learn Japanese with Beni-sensei. 800+ cards across 20 decks, real native audio, AI decks for any topic, and oral practice that talks back.

Koi Kioku is a Japanese learning app built around one idea: memory that lasts. Beni-sensei, your koi fish teacher, guides you through spaced repetition (FSRS) that schedules each card at exactly the right moment.

FREE FOREVER • Hiragana & Katakana — complete recognition decks • First Words & Emergency phrases • Smart review scheduling that adapts to you • Works fully offline — your learning data never leaves your device

KOI KIOKU PRO • Every deck unlocked — all levels and situations • AI decks: type any topic ("ordering at a cafe") and get a 20-card deck made for you • Oral practice: answer out loud, and Beni-sensei reacts in character — choose her personality, from fired-up coach to sharp-tongued critic to Kansai comedian • Ask anything about Japanese while you study • Audio on every card

STUDY THAT FEELS ALIVE Multiple exercise types (choice, listening, cloze, typing, matching), correct/wrong sounds, streaks, and a mascot who actually cares whether you remember.

PRIVACY FIRST Your cards and progress stay on your device. No ads, no tracking, no analytics SDKs. Speech recognition for oral practice runs entirely on-device — audio never leaves your phone.

Subscription: Yearly $59,99 or Monthly $12,99 Auto-renews, cancel anytime in Settings. Terms: https://koikioku.onebuzz.net/support Privacy: https://koikioku.onebuzz.net/privacy