Learn Japanese words
that actually stick.
Kioku (記憶, “memory”) builds your Japanese vocabulary with a few minutes of practice a day — spaced review, varied exercises and pronunciation checks, all in one calm app.
Google Play — coming soon
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Spaced review
Words come back right before you'd forget them, so study time goes where it matters.
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Many ways to practise
Flashcards, matching rounds, sentences and kanji building keep reviews quick and varied.
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Speak and get checked
Say the word out loud — an on-device model checks your pronunciation without sending audio anywhere.
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Focus Guard
Optionally swap a few minutes of scrolling for a quick review when you open distracting apps.
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Works offline
Practise anywhere. With an account, progress syncs across your devices when you're online.
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No ads, no tracking
Kioku has no ads and no analytics SDKs. Your data is used to run the app — nothing else.