AI-powered Japanese, beautifully simple

Learn Japanese Smarter.

Master kana, vocabulary, and conversation through an elegant platform that blends adaptive AI with the depth of Japanese culture. From your first ひらがな to fluent 会話 — Kotoba grows with you.

Daily Quiz

Practice

2,300+

Kanji & words

Illustration of Mount Fuji with cherry blossoms representing Japanese learning

桜

sakura · cherry blossom

Daily streak

28 🔥

特徴 · Features

Everything you need to reach fluency

One elegant platform that unifies every part of your Japanese learning journey — powered by adaptive AI.

AI Translation

Translate between Japanese and English instantly, with context, nuance, and natural phrasing explained line by line.

Kana Practice

Master hiragana and katakana with stroke-order guidance, handwriting recognition, and spaced repetition.

Daily Vocabulary

A fresh, personalized set of words every day, tuned to your level and the topics you care about.

Flashcards

Smart SRS flashcards that adapt to your memory, surfacing words right before you forget them.

Quiz System

Reinforce learning with adaptive quizzes covering reading, listening, grammar, and meaning.

Sentence Practice

Build natural Japanese sentences with contextual examples, guided practice, and instant feedback.