OneJPN: Japanese Mastery is made and published by iSGM. AppBrain is an independent app data site and isn't affiliated with iSGM. The app name, icon, screenshots and description belong to iSGM and are shown as published on the App Store.
AppBrain's verdict
Removed- Rating on App Store
- 4.07
- 14 ratings
- Last updated
- December 12, 2025
OneJPN: Japanese Mastery is no longer on the App Store. It had too few ratings to say what users thought.
Competitors
Similar apps and more from iSGMMore from iSGM
Also available on Google Play
Releases
Updates seen on the App Store- Version
- 3.2.0
- Launched
- April 2024
No changelog data
User feedback
Ratings and reviews on the App StoreComments on OneJPN: Japanese Mastery for iOS
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Technology
Found in the app by AppBrain- Price
- Free
- App size
- 146.7 MB
- Content rating
- Everyone
Technologies used by OneJPN: Japanese Mastery
About the app and developer
About OneJPN: Japanese Mastery
OneJPN: Japanese Mastery was an education app developed by iSGM. It was removed from the App Store Jun 15, 2026.
User Ratings
OneJPN: Japanese Mastery was rated 4.07 out of 5 stars, based on 14 ratings.
App Information
OneJPN: Japanese Mastery was free. The app size was 146.75 MB. The last available version was 3.2.0. The last update was on December 12, 2025.
Technical Requirements
The app had a content rating of Everyone. The app had been available on the App Store since April 2024.
Developer information for iSGM
Address:
Frequently asked questions about OneJPN: Japanese Mastery
Is OneJPN: Japanese Mastery free?
Yes. OneJPN: Japanese Mastery was free on the App Store.
Is OneJPN: Japanese Mastery still available?
No. OneJPN: Japanese Mastery was removed from the App Store. We last saw it there Jun 15, 2026.
How large is OneJPN: Japanese Mastery?
OneJPN: Japanese Mastery is 146.75 MB.
Is OneJPN: Japanese Mastery suitable for children?
App Store rates the content of OneJPN: Japanese Mastery as suitable for everyone.
How do people rate OneJPN: Japanese Mastery?
OneJPN: Japanese Mastery scored 4.07 out of 5 stars, from 14 ratings on the App Store.
Who made OneJPN: Japanese Mastery?
OneJPN: Japanese Mastery was developed by iSGM. It was listed in the education category on the App Store.
What are the best alternatives to OneJPN: Japanese Mastery?
People looking at OneJPN: Japanese Mastery also look at these education apps: Kanji Study JLPT - Tensai, JLPT N3 Level, JLPT Learn Japanese ForMyanmar, JLPT - Kanji Quiz, JLPT Mochi : N5-N1 JLPT Test.
Store listing
By iSGM, from the App StoreSimilar apps
Description by iSGM Written by the developer, not by AppBrain. Click to read.
Stay motivated with engaging video-lessons by V-tuber teachers and improve your Japanese skills with AI-generated questions. Plus, prepare for Tokutei Gino with tailored content to support your career goals in Japan. Download the app now for free and conquer the JLPT and Tokutei Gino!
Why One JPN: Japanese Mastery?
1. Comprehensive Assessment Test: Wondering where you stand in your Japanese proficiency journey? Our assessment test will pinpoint your strengths and areas for improvement, setting the stage for personalized learning.
2. Engaging Video-Lessons: Dive into dynamic video-lessons led by fluent V-tuber teachers who make learning Japanese fun and interactive. Whether you're preparing for JLPT or Tokutei, our engaging content will keep you hooked.
3. Practice, Practice, Practice: Hone your skills in grammar, vocabulary, listening, and reading with practice questions in both test mode and normal mode for JLPT and Tokutei.
4. AI-Generated JLPT Question Sets: Prepare with AI-generated questions designed to mimic the format and difficulty of the actual JLPT exam.
5. Tokutei Vocabulary Flashcards: Learn essential Tokutei-specific vocabulary to boost your chances of success in the Tokutei Gino exams.
6. Tokutei Study Notes: Access detailed study notes tailored to Tokutei Gino, covering critical topics and practical knowledge to ace the exam.
7. Essential Tips for Japan Lifestyle: Get practical advice on navigating life in Japan, from cultural etiquette to daily living hacks, specifically designed for Tokutei applicants.
Benefits of One JPN:
Personalized Learning: Tailored assessment results and customizable practice options adapt to your unique learning needs and pace.
Engagement and Motivation: Vibrant video-lessons and interactive activities keep you motivated to achieve your goals.
Confidence Building: Comprehensive study materials and realistic practice questions ensure you're ready for the JLPT and Tokutei exams.
Don’t just study Japanese—master it with One JPN: JLPT Mastery and Tokutei Preparation!
Download now and start your journey to success in Japan.