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
Ratings & Reviews
This app has not received enough ratings or reviews to display an overview.
- Improved wording and translations throughout the app in English, Korean, German, Spanish, French, and Traditional Chinese.
- Character profile descriptions now update when you change the app language.
- Fixed an issue on Android where the last words of voice input could be lost when stopping speech recognition.
- Improved stability during screen transitions on iOS.
Version 7.11.3
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
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
User Content
Privacy practices may vary based, for example, 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
Provider
Daiki Sato
Size
84.5 MB
Category
Education
Compatibility
Requires iOS 16.4 or later.
iPhone Requires iOS 16.4 or later.
iPad Requires iPadOS 16.4 or later.
Mac Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
Apple Vision Requires visionOS 1.0 or later.
Languages
English and 6 more
English, French, German, Japanese, Korean, Spanish, Traditional Chinese
