AnkiDroid is a flashcard app built around spaced repetition. Instead of showing every card on a fixed schedule, it shows a card again just before you are likely to forget it, which is the point of the method: review effort goes where memory is fading.
It is compatible with the desktop Anki program, so decks built there can be studied on Android, and review progress follows the same spaced-repetition approach.
A note on services, shown here rather than buried: sync is opt-in and uses the non-libre AnkiWeb service by default, but that can be changed in settings to an unofficial sync server. Crash reporting and analytics are also opt-in and off by default, sending data only if you enable them.
Verification details
Verified build: AnkiDroid 2.25.3 (version code 22503300) for Android 7.0 or newer. File: 111,923,795 bytes (106.74 MiB). SHA-256: bd0ac8cb9ddff42e1c316e37ee1e5f2cbe94a30f81485fa317d53664574c2b3a. Signature check (apksigner): Verifies. APK Signature Scheme v1: not verified; v2: verified; v3: verified. Signer certificate SHA-256: 24a3d4756c62dd69c86df69aa7fa327b2a6bf55f55c4a1749f99bd1da75906bb (F-Droid per-app signing key for this build). No F-Droid anti-features are listed for this build; the service disclosures in the article above are description notes, not anti-features. Download: https://f-droid.org/repo/com.ichi2.anki_22503300.apk. Source update: 2026-10-22. Last checked: 2026-10-29. Signature verification does not guarantee that an app is free of malware.
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