Sullivan Japanese
Real-world Japanese, with AI
Free · In‑App Purchases
Sullivan Japanese is a learning app for everyone studying Japanese.
Read, write, listen and speak — learn Japanese you can actually use, adapted to your level.
■ Graded by AI, instantly
Get specific, sentence-by-sentence feedback on your writing and speaking in seconds.
■ Always the right question
AI reads your ability across four skills and serves only the problem you should solve now — never too easy, never too hard.
■ Practice by talking with AI
An AI partner that weaves your own mistakes into a natural conversation, so you actually speak.
■ A habit that sticks
A daily plan and quests show what to do today, while streaks, XP, weekly leagues and achievements make studying a game you look forward to.
■ Built so you never get lost
Furigana readings and an interface in English, Chinese or Vietnamese keep beginners moving.
Learn every day for free. Premium unlocks unlimited practice, AI grading and AI tutor. Start with 7 days free.
Premium is an auto-renewable subscription (Monthly ¥980 / Yearly ¥5,800, with a 7-day free trial). Payment is charged to your Apple ID and auto-renews unless turned off at least 24 hours before the end of the period. Manage or cancel anytime in Settings > Apple ID > Subscriptions.
Privacy Policy: https://nihongo.sensei-sullivan.com/privacy?lang=en
Terms of Use (EULA): https://nihongo.sensei-sullivan.com/terms?lang=en
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
We rebuilt our notification delivery so study reminders arrive more reliably, along with general stability improvements.
The developer, Koji Okamoto, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Contact Info
- User Content
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Koji Okamoto
- Size
- 15.1 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later.
- iPhone
- Languages
English and 3 more
- English, Japanese, Simplified Chinese, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Premium (Yearly) $34.99
- Premium (Monthly) $5.99
- Copyright
- © 2026 Koji Okamoto
