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.
The beta is a direct APK download; Android may ask you to allow installs from your browser.
Spaced review
Words come back right before you'd forget them, so study time goes where it matters.
Many ways to practise
Flashcards, matching rounds, sentences and kanji building keep reviews quick and varied.
Speak and get checked
Say the word out loud — an on-device model checks your pronunciation without sending audio anywhere.
Focus Guard
Optionally swap a few minutes of scrolling for a quick review when you open distracting apps.
Works offline
Practise anywhere. With an account, progress syncs across your devices when you're online.
No ads, no tracking
Kioku has no ads and no analytics SDKs. Your data is used to run the app — nothing else.