Zero-friction drilling
Pick a level (N5, N4, or N3), choose verb types or adjectives, and start. The system handles the rest.
Conjugation Lab
Build Japanese conjugations into muscle memory.
Katachi focuses on one skill: turning Japanese verb and adjective conjugation into fast, reliable recall through short drills, smart distractors, and targeted repetition.
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Free practiceNo sign-up requiredJLPT N5-N3 patterns
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JLPTDictionary form
泳ぐ
Make the te-form
Which answer connects the sentence correctly?
泳いでA
泳ってB
泳んでC
12
prompts
4
forms mixed
1
weak spot surfaced
The distractors are intentionally close, so each round gives you the repetition you need to make the form automatic.
N5-N3
levels covered
2
practice modes
0
setup required
Why it matters
Why conjugation needs focused practice
Many learners understand conjugation rules in isolation, but still hesitate when a sentence requires the right form: past, negative, te-form, potential, passive, causative, or conditional.
Textbooks explain the rules. Flashcards show the answers. Katachi gives you the focused repetition you need to make conjugation automatic.
No setup. No distraction. Just practice.
Start Practicing NowSmart weakness detection
Struggle with te-form? The system notices and surfaces more te-form practice. You don't have to track your weaknesses — Katachi does it for you.
Dual practice modes
Multiple Choice for quick recognition, Typing Mode for active recall. Switch anytime.
Daily streaks
Short, focused sessions you can actually maintain. Consistency beats intensity.
Practice setup
Three ways to practice
Choose a ready-made session, target your weak spots, or take full control when you want to drill a specific grammar point.
01
Daily Drill
A curated session generated automatically every day. Just open the app and go — no decisions needed.
02
Weakness Training
Katachi analyzes your mistakes and builds sessions that target your weakest forms. te-form trouble? You will get more te-form until it clicks.
03
Free Practice
Full control. Pick any level, word type, and conjugation form combination. Perfect for drilling a specific grammar point before a test.
Every form you need from N5 through N3
Verbs
Polite (masu), Plain negative, Past plain/polite, Te-form, Potential, Passive, Causative, Imperative, Volitional, Conditional (ba/tara)
Adjectives
i-adjective & na-adjective forms for polite, negative, past, and conditional
Why stop at N3?
Katachi covers N5 through N3, but that is not because N2 and N1 are unimportant. It is the opposite — once you drill the fundamental conjugation patterns into muscle memory, advanced vocabulary is just a different stem with the same rules.
This is not a vocabulary app. It is a conjugation drill tool. You do not need to memorize ten thousand words to master conjugation. You need repetition on the patterns until they become automatic, regardless of the word.
Ready to build conjugations into muscle memory?
Practice Japanese conjugations for free, with no sign-up required.