Learn Japanese in just a few minutes a day with kanji cards, JLPT study paths, and a smart SRS‑based learning system. Forget boring flashcards — with Kanjidon, every review becomes an adventure. Kanjidon uses the SM‑2 algorithm, the same spaced repetition method trusted by millions of learners worldwide. Easy kanji appear less often, difficult ones return at the perfect moment. Maximum retention, minimum effort.