LangJournal is a Japanese writing practice app that helps you learn by keeping a diary.
Write about your day in Japanese, get AI corrections, understand why each correction was made, and ask questions when you need help.
By turning your own thoughts and daily life into Japanese practice, you can build a habit that feels personal, practical, and easy to stick with.
[Key Features]
■ Write Japanese with AI corrections
Write a short diary entry in Japanese and get instant AI feedback.
LangJournal checks grammar, wording, vocabulary choices, and natural phrasing so you can improve your writing step by step.
■ Understand every correction
Corrections come with explanations, not just rewritten sentences.
You can see what changed and why, helping you avoid the same mistakes next time.
■ Ask AI when you’re stuck
After your diary is corrected, ask follow-up questions about grammar, nuance, word choice, or more natural expressions.
Learn from your own sentences, not generic examples.
■ Review mistakes with quick quizzes
Turn your corrected diary entries into quick review quizzes.
Practice the points you missed and build stronger habits through small, focused review.
■ Track your weekly progress
Review your writing activity, AI chats, the words you used, and learning progress each week.
Seeing your progress helps you stay consistent and understand how your Japanese writing is improving.
■ Practice Japanese with AI chat
Chat with AI characters by text or voice.
Use topics from your diary, or talk about anything you like, to practice Japanese in a more interactive way.
■ Also supports 10+ languages
In addition to Japanese, LangJournal supports English, Korean, Chinese, Spanish, German, French, Portuguese, Dutch, Italian, Polish, Swedish, and Tagalog.
You can keep practicing in one app as your language goals grow.
■ Zena keeps you motivated
Zena supports your daily learning with encouraging comments based on your activity.
Even a short diary entry can become a small step toward improving your Japanese.
[Recommended For]
• People who want to practice writing Japanese every day
• Learners who want AI corrections and grammar explanations
• People who want to understand why their Japanese sounds unnatural
• Learners who want to ask questions about their own sentences
• People who want to build a simple and sustainable language learning habit
I really like the app, but the ad close button is not working.I cannot dismiss ads on both iPhone and iPad, and it forces me to restart the app. とても良いアプリだと思っていますが、広告の閉じるボタンが機能しません。iPhoneとiPadの両方で発生しており、広告を閉じることができずアプリを再起動する必要があります。
Developer Response
Sorry for the inconvenience. Could you please try again and check whether the issue happens again? If it does, please contact us through the in-app Inquiry form and tell us your device model (for example, iPhone X or iPhone 15).
Add CEFR to more than English learners!
Corlew0
App is mainly only geared towards English learners. Most of the good features that would draw interest aren’t available for any other languages. The CEFR tracking is a powerful feature that drew me to this app; mainly because I want Spanish and French CEFR certifications in the future. This would have helped tremendously towards my goals. This feature should at least be available for Spanish learners being that Spanish is in the top 3 most learned languages in the world.
Developer Response
Thanks for the feedback! We agree—CEFR support for Spanish and French is important. We're planning to expand it in the future!
Excellent Language App
Kfvg65
I have many language apps. They all seem to do word to word translations. This is the only app I found with tips so your phraseologysound authentic. It is the app I have been looking for.
Developer Response
Thank you so much! We're glad the app helps you speak more naturally. Your feedback truly motivates us!
Features
Alice Quiz
I like that this journal gives prompts and corrections, which is what I was looking for in an app to improve my writing and grammar in Spanish. However, I can’t find the teams or CEFR analysis functions, which I think would be very helpful with this additional feedback and community.
Developer Response
Currently, CEFR is only supported for English. As for the teams, we support German, English, and Korean. We plan to gradually add support for more languages, so we kindly ask for your patience in the meantime.
- Added Quick and Deep modes for diary checks.
- Improved AI correction quality and follow-up checks.
- Fixed an issue where saving could stop if a correction failed.
Version 7.6.1
The developer, Daiki Sato, 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
Identifiers
Data Linked to You
The following data may be collected and linked to your identity:
Purchases
Location
Contact Info
User Content
Search History
Identifiers
Usage Data
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Daiki Sato
Size
84.2 MB
Category
Education
Compatibility
Requires iOS 15.1 or later.
iPhone Requires iOS 15.1 or later.
iPad Requires iPadOS 15.1 or later.
iPod touch Requires iOS 15.1 or later.
Mac Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
