Frequently Asked Questions

The Watch app is designed for quick study sessions with limited memory. When you tap "Load More" to get the next batch of cards, the undo history is cleared to keep memory usage low. This is intentional — the Watch widget is optimized for short study bursts throughout your day. If you're planning a longer study session, we recommend using the main Danki app on your iPhone, which has full undo support across your entire session.

Danki uses the FSRS (Free Spaced Repetition Scheduler) algorithm to optimize your learning. When you rate a card: • "Again" — You'll see the card again soon (within minutes) • "Good" — The card is scheduled for later based on how well you know it • "Known" — The card is marked as mastered and won't appear in reviews The algorithm adjusts intervals based on your performance, showing difficult cards more often and easy cards less frequently.

The Apple Watch keeps its study state aligned with its paired iPhone. Hosted account sync across Apple devices is paused for everyone while we redesign it. Your study progress stays on the device where you study. You never need an account for local study. A Danki account can link eligible Pro purchases, but signing in does not upload your progress. We are exploring iCloud-based sync for a later release; availability and terms have not been set.

Danki covers all JLPT levels from N5 (beginner) to N1 (advanced): • N5: 80 kanji • N4: 170 kanji • N3: 370 kanji • N2: 380 kanji • N1: 1,136 kanji That's over 2,100 kanji with vocabulary examples, readings, and meanings.

Yes. The Apple apps keep the course content and audio on your device, so you can study without an internet connection. During the sync pause, progress does not automatically move to another device when you reconnect. You can export a local copy from Settings.