Kakugo

Kakugo makes learning Japanese fun and efficient with adaptive quizzes on hiragana, katakana, kanji, and vocab. It uses spaced repetition to match your pace, whether you're studying 30 or 100 kanji a day. Features include JLPT sorting, unlimited quizzes, no ads, and offline use—great for commutes or focused sessions. Open-source and always ready to help you learn!