K2Kanji
Adaptive drills for kanji, and for anything else you want to remember.
Learning
What it is
K2Kanji started as a kanji trainer. It now also drills Chinese hanzi, Korean hangul, Spanish vocabulary, Latin, medical anatomy, country flags, 100 classic cocktails and Rubik's cube algorithms, using thermal learning, an adaptive spaced-repetition method, to choose what to show next.
Every drill is free and works without an account. K2 keeps one study streak across your devices and shares your daily accuracy as a percentage bar.
Where Bike4Mind fits
Sign in with Bike4Mind to sync your progress, hear HD voices and practise with live AI. That AI usage bills to your Bike4Mind credits, and K2 shows your credit balance.
Latest updates
- FeatureK2 404 page links to every app
Unmatched K2 URLs now show a Page not found page with links to every K2 app.
- FeatureK2 shares daily accuracy as a percentage bar
K2 result shares now show the exact daily accuracy percentage and a 10-block green and red bar, replacing the emoji grid.
- FeatureShare dialog scrolls and shares text
The share dialog now scrolls on short screens instead of clipping the card, and shows the share text with a Copy text action.
- FixK2 Tempo shows the game first
K2 Tempo Notes and Chords now show the drill above the achievements, and the header controls wrap inside mobile screens.
- FixK2 tags CJK text with its language
K2 now tags Japanese, Chinese and Korean text with its language, so browsers pick the right Han glyph shapes and screen readers pick the right voice.
Screenshots and video
