01
See it in context
A Japanese word, an English prompt, and the exact form you need to produce.
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Make Japanese conjugation stick.
Build fast, accurate recall with bite-sized verb and adjective drills—then look up any form the moment you need it.
JLPT N5 → N1
Learn at your level, at your pace.
Practice that adapts
Less memorizing.
More knowing.
Katsuyo turns the forms you recognize on paper into Japanese you can recall without hesitation.
02
Choose, hear, repeat
Get instant feedback and hear the right answer pronounced after every turn.
03
Strengthen weak spots
Spaced repetition brings back what you miss and lets mastered forms fade out.
More than a game
Your Japanese conjugation reference, too.
Search by kanji, kana, or English meaning. Katsuyo gives you a complete, readable table with pronunciations and plain-English context for each form.
- ✓ Verbs, い-adjectives, and な-adjectives
- ✓ Readings, meanings, verb groups, and JLPT levels
- ✓ Audio for every conjugated answer
Browse: N5 verbs · Ichidan verbs · Godan verbs · Te-form list
Open the conjugation search
Built for real progress
Everything you need.
Nothing you don’t.
Study your way
Start with the Daily Five — the same five conjugations for everyone, every day, with a streak to keep. Then race the clock in Play mode or slow down in Study mode, over a whole JLPT level or a hand-picked set of words and forms.
Progress you can see
Track accuracy by conjugation and word class, revisit mistakes, and watch recall become automatic.
Smart review
The forms you miss return sooner, and a Review tile on the home screen serves the ones due today. The ones you know make room for something new.
Japanese audio
Hear each correct answer, build sound-form connections, and practice with your eyes and ears.
Private by default
No ads. No tracking. No account needed. Create one only if you want your progress to follow you across devices.
One app, every level
Start where you are.
Go as far as you like.
From your first て-form to advanced passive and causative patterns, Katsuyo grows with your Japanese.
Choose your levelN5Build the foundations
N4Grow everyday range
N3Connect more forms
N2Handle nuance
N1Complete the range
Good to know
Questions,
answered.
Still curious? Katsuyo is free, so the easiest way to understand it is to try a round.
What conjugations can I practice?
Katsuyo covers the core plain and polite forms across JLPT N5–N1: present, past, negative, te-form, potential, passive, causative, conditionals, volitional, imperatives, and more.
Does Katsuyo include adjectives?
Yes. Verbs, い-adjectives, and な-adjectives are included at every JLPT level.
Can I use it as a conjugation dictionary?
Yes. Search by Japanese spelling, reading, or English meaning, then open a complete conjugation table with audio and English context.
Do I have to create an account?
No. Everything works without an account. An optional account simply backs up your progress and syncs it across devices.
How much does it cost?
Katsuyo is free and has no advertising. Optional tips support the independent developer, but they never unlock content or features.
活用 · katsuyō · conjugation
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