The Japanese learning app that learns you.
From zero kana to native fluency — without the twelve-tool stack.
Today's best Japanese learners stitch together twelve apps, a textbook, a Discord, and three video players. The stack is incredibly powerful. It is also unforgivable — hostile to everyone who is not already obsessed.
A word saved in two seconds is worth ten perfect cards that never got made. The first two seconds of any interaction are sacred.
Users see beautiful cards; AI is what built them. Users see a roleplay partner; AI is what graded their pitch accent in the background.
Reviews should feel like checking Instagram, not doing taxes. The scheduler serves the learner — never the other way around.
What you read, watch, message, and overhear in Tokyo flows back into the app. Not the other way around. The world is your textbook.
Streaks. Friends. Leagues. Money on the line. A senpai who notices when you slip. We pick the right accountability tool for who you are — and we make showing up every day feel inevitable.
Save a word from anywhere, in any form. Type it in kana, snap a manga panel, voice-note a sentence you overheard on the train, share a YouTube subtitle, double-tap the Apple Watch crown.
AI silently turns that two-second capture into a full card: kanji, kana, romaji, pitch accent, example sentence, audio, and a memorable mnemonic.
FSRS-6 by default, tuned to your memory — not the average human's. Skip a week and the queue softens; nail a streak and it stretches. Your forgetting curve is yours alone.
Power users can crack open every knob. Everyone else never has to know the knobs exist.
The native immersion stack — Yomitan-style dictionary lookups, manga OCR, video sentence mining, frequency-ranked vocab — without the seven browser extensions and a YouTube-DL setup.
Read a novel inside Decki. Watch a drama with smart subtitles. One tap turns any unknown word into tomorrow's review.
Roleplay a conbini transaction. Practice a job interview. Argue about ramen toppings. Your tutor speaks at exactly the level you've earned — and pushes you a hair past it.
Pitch accent feedback. Pronunciation grading. Patient, infinite, and never bored of you.
Streaks that don't break your spirit when life happens. Leagues with strangers who get it. A senpai-kohai pairing that notices when you go dark. Money on the line if you want it.
For the obsessed: turn it all off and just review in silence. The product respects every kind of learner.
Three glimpses of the app — capture, review, progress.
Cloverfield is an independent app studio working on tools that respect their users — software that earns its place on your home screen by being beautiful, considered, and quietly powerful.
We're starting with the hardest language an English speaker can learn, and the most fragmented learning category we could find. If we can fix that, we can fix anything.
— Cloverfield Studio · Tokyo & Sydney
The first thousand users get lifetime founder pricing, a hand-written welcome, and a say in what we build next.