# Language Diary: LangJournal — AI Writing & Corrections

> AI-powered language diary for practice, correction, and peer learning. (iPhone/iPad app by Daiki Sato.)

- Source: https://appshunter.io/ios/app/language-diary-langjournal/id6448331480 (this page in markdown: same URL + `.md`)
- Developer: [Daiki Sato](https://appshunter.io/developer/1329526543)
- Category: Education, Lifestyle
- Price: Free with in-app purchases
- Rating: 4.40/5 from 25 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.4 · 81 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, European Spanish, Chinese (Traditional, Taiwan)
- Released: 2023-04-25
- Data updated: 2026-08-23
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/language-diary-langjournal/id6448331480/reviews.md

## What is Language Diary?

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

## Key features

- AI-powered diary corrections
- Chat and conversation with AI
- Peer collaboration in teams
- CEFR level evaluation
- Voice recording for pronunciation
- Attach images/videos to entries
- Passcode lock for privacy

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium Monthly Subscription | $4.99 | per month |
| Premium Yearly Subscription | $49.99 | per year |
| CEFR+ Monthly Subscription | $8.99 | per month |
| CEFR+ Yearly Subscription | $89.99 | per year |
| Pro Monthly Subscription | $5.99 | per month |
| Pro Yearly Subscription | $59.99 | per year |


## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/language-diary-langjournal/id6448331480/reviews.md

### 4/5 — Ad close button not working

*2026-04-03*

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).

### 5/5 — Excellent Language App

*2025-11-16*

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!

### 2/5 — Add CEFR to more than English learners!

*2025-06-23*

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!

### 5/5 — Useful app

*2025-05-06*

This app is good for creating writing English journal habit. It’s easy to use, and it has some interesting and unique features for English learners 💯

**Developer response:** So glad to hear that—thanks for the great review! We’ve got more fun and useful features on the way. Hope you keep enjoying your journal time with us!

### 5/5 — Excellent Language App

*2025-03-30*

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!

### 3/5 — Features

*2024-09-15*

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.

### 5/5 — So useful!

*2024-07-12*

One of the best tools for improving and practicing on new language.

**Developer response:** Thank you for the great feedback! We’re glad our app is helping you improve and practice your new language. Keep up the great work!

## Frequently asked questions about Language Diary

### What languages does Lang Journal support?

Lang Journal supports a wide range of languages including English, Korean, Japanese, Chinese, French, German, Spanish, Portuguese, Dutch, Italian, Polish, Swedish, and Tagalog.

### How does the AI correction feature work in Lang Journal?

The AI instantly reviews your diary entries for grammar, vocabulary, and syntax. It offers three distinct AI engines, providing unique correction styles and multiple sets of feedback to help you improve.

### Can I learn with friends using Lang Journal?

Yes, you can form teams of up to five members to share diaries and comments, offering mutual encouragement. This feature is currently available for English, Korean, and German learners.

### Does Lang Journal offer pronunciation practice?

Yes, after writing your diary, you can record your voice to save and verify your pronunciation within the app. Reading aloud helps strengthen memory and aids in real-life conversations.

### What are the subscription options for Lang Journal?

Lang Journal offers several subscription plans, including Pro, Premium, and CEFR+ Monthly and Yearly options, all with a 7-day free trial for monthly plans.

### How does Lang Journal evaluate my writing progress?

Your journal entries are analyzed for vocabulary, grammar, and verb usage, then rated on the six-level CEFR scale from A1 to C2. This feature is currently available for English learners.

### Is Lang Journal suitable for test preparation?

Yes, strengthening your writing skills through consistent diary entries and AI feedback makes Lang Journal ideal for test preparation, including for exams like TOEFL.

### Does Lang Journal have ads?

No, Lang Journal does not contain advertisements, allowing for an uninterrupted learning experience.

## Version history (last 5 releases)

### 7.11.1 — 2026-08-21

- AI Question messages are now easier to read with bold text and lists, and links can now be opened.
- Improved the layout around system bars and feature hints on newer Android versions.
- Improved the stability of voice input and multiline text input on iOS.
- Improved support for newer operating systems and overall stability.

### 7.10.10 — 2026-08-17

- Added Traditional Chinese as an app display language.
- Improved English translation exercises with clearer, more natural questions and example answers.
- You can now edit published diary entries up to 1,300 characters.
- Added a recommendation to recheck diary entries when many corrections are found.
- Improved reliability when deleting multiple diary entries.

### 7.10.9 — 2026-08-16

- Improved the reliability of AI Chat and the quality of memories used in conversations.
- Fixed an issue that could prevent saved dates from being restored correctly after restarting the app.
- Clarified what happens to your data when you delete your account.

### 7.10.8 — 2026-08-11

- Fixed an issue that could cause AI Chat to fail after sending a message.

### 7.10.7 — 2026-08-10

- Improved AI Chat with easier conversation starters, shorter and more natural replies, and optional in-chat corrections for Premium users.
- Improved AI-powered translations, correction explanations, translation challenges, and review exercises.
- Updated Ask AI and added advance notice about upcoming Free plan usage-limit changes.
- Fixed the streak display after completing a 7-day cycle, support for longer email addresses, and reminder behavior.

## Apps similar to Language Diary

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Up Level - AI Language Tutor](https://appshunter.io/ios/app/up-level-ai-language-tutor/id1665320058) | 3.9 (9) | Free | Education |
| [Blossom Diary - Learn Language](https://appshunter.io/ios/app/blossom-diary-learn-language/id1488243515) | 4.3 (3) | Free | Education |
| [DRAWER – AI Language Journal](https://appshunter.io/ios/app/drawer-ai-language-journal/id6477773114) | 4.9 (28) | Free | Education |
| [Learn Spanish: News by Readle](https://appshunter.io/ios/app/learn-spanish-news-by-readle/id6450673737) | 4.7 (170) | Free | Education |
| [AI Spanish Grammar Checker](https://appshunter.io/ios/app/ai-spanish-grammar-checker/id6453511670) | 3.0 (2) | Free | Education |
| [TODAI: Learn Spanish by news](https://appshunter.io/ios/app/todai-learn-spanish-by-news/id6446880636) | 4.5 (13) | Free | Education |

## More apps by Daiki Sato

- [Interchao - Japanese learning](https://appshunter.io/ios/app/interchao-japanese-learning/id1510150748)
- [ハンターハンター漫画オタク検定 - 俺でなきゃ見逃しちゃうね](https://appshunter.io/ios/app/id1609851189)
- [ＤＢ漫画オタク検定 - 戦闘力たったの5か…ゴミめ](https://appshunter.io/ios/app/5/id1611004024)
- [デスノート漫画オタク検定 - さぁ、私を殺してみろ！](https://appshunter.io/ios/app/id1611867533)
- [スラダン漫画オタク検定 - さあいこーか](https://appshunter.io/ios/app/id1611872885)
- [よつばと！漫画オタク検定 - おわらない夏のおわり](https://appshunter.io/ios/app/id1615379827)

All apps by Daiki Sato: https://appshunter.io/developer/1329526543

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*