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Japanese, finally readable.

See every word, form, and meaning — in one tap.

Adv今
N日本語
Pを
Vt勉強しています
|
→I'm studying Japanese now.

How this form was built

勉強する+ -ing→勉強している+ polite→勉強しています

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Why katsuYo?

What sets katsuYo apart from other Japanese apps.

Analyze any sentence

Paste a line from manga, news, or anime — every word, form, and meaning AI-verified, plus the multi-step conjugation chain that built each verb.

Learn step by step

Free courses for every level — N5 (beginner) to N1 (advanced). Every grammar point lives in its own lesson.

Test what you know

Quizzes auto-generated from every sentence you analyze — your own examples become flashcards. Track what's stuck.

Tuned by hand, not just AI

AI helps and verifies at scale, but every example stays hand-editable. So the nuance native speakers notice — what's slightly off — doesn't quietly slip into what you learn.

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Save sentences, track lessons, build your library — free to start.

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New to Japanese? Start with the free N5 course →

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