Nihonzo
Twenty minutes lost switching apps?
Read, look up and ask AI on one screen
Long-press any word for its meaning, or ask the AI tutor what a sentence really says — without leaving the page.
AI-powered · iOS & Android
Your Japanese companion, powered by AI.
Read the news you actually care about. Learn from any YouTube video with AI explaining every line. Follow a plan that adapts to what you already know. Nihonzo goes wherever your Japanese goes — from your first N5 grammar point to real-world fluency.
What’s inside
Everything you need to learn Japanese, in one app
No ads, no account to create, no distractions.
Spare minutes, but your textbook is at home?
Your textbook, in your pocket
Grammar from N5 to N1, organised by JLPT level and by Shinkanzen and So-matome, in short daily sessions. Core lessons work offline.
Too many unknown words in real Japanese?
News at your level
Articles are ranked by how much of them you already understand, and any unknown word is one long-press away.
Videos too fast to learn from?
Any video, turned into a lesson
Paste a YouTube link and AI builds a line-by-line lesson — reading, translation and grammar notes, synced to the video.
You can read it, but freeze when you speak?
Speak your part in real conversations
Role-play everyday conversations out loud and see which words came through and which didn't.
Can't type the kanji you're looking at?
Grammar, words and pitch accent in one search
Look up vocabulary, grammar and kanji in one place — or draw a kanji you can't type.
Learn it today, forget it next week?
A plan that remembers for you
Set your JLPT level and exam date. Spaced repetition brings each word back just before you'd forget it.
Also inside:
Grammar N5 → N1Vocabulary & kanjiKanji stroke practiceConversation role-playPitch-accent shadowingJLPT mock testsGames & a pet elephantDaily remindersCore lessons work offline
Plans: 7-day free trial · 6 months · 12 months · Lifetime
Real screens from the iOS app (Vietnamese interface).
How it works
Start free, unlock when you're ready
Install and start learning
Every new device gets a 7-day free trial with full access. No email, no password.
Connect your AI
Add your own key from OpenAI, Google Gemini or DeepSeek to turn on the AI features. The key stays on your phone.
Unlock the full app
Buy 6 months, 12 months or lifetime in the App Store or Google Play.
Support
Frequently asked questions
How do the AI features work? Do I pay extra?
Nihonzo connects to the AI provider you choose — OpenAI, Google Gemini or DeepSeek — using your own API key, which you enter once in Settings. The app includes step-by-step instructions for getting a key. Any usage is billed by that provider directly to you (some providers offer a free tier). Your key and your questions go straight from your phone to the provider; they never pass through our servers.
Which news sites can I read?
NHK News Web Easy, NHK, Asahi, Yahoo! News Japan and livedoor are built in, and you can add any Japanese website you like. Articles open in the app's reader, where you can long-press any word to look it up or ask AI about it.
Can I use any YouTube video?
Any video that has Japanese captions. Paste the link, and AI builds a line-by-line lesson from the captions. The lesson is saved on your phone for rewatching.
I changed phones. How do I get my purchase back?
Install the app on the new phone, open the purchase screen and tap “Restore purchases” while signed in to the same Apple ID or Google account you bought with. Your study progress can be moved with Settings → Backup & restore.
How do I get a refund?
Purchases made in the App Store or Google Play are refunded by Apple or Google under their refund policies.
Do I need an internet connection?
Grammar, vocabulary, kanji, conversations, tests and your progress all work offline. News, YouTube lessons and AI features need a connection.
How do I delete my data?
See Delete my data.
Still stuck? Send us a message and we will get back to you.