# MiiBook Journal: Private Diary — A timeless journal for life. > Simple, private digital diary app with AI summaries and local data storage. (iPhone/iPad app by Ryunosuke Nagase.) - Source: https://appshunter.io/ios/app/miibook-journal-private-diary/id6451179720 (this page in markdown: same URL + `.md`) - Developer: [Ryunosuke Nagase](https://appshunter.io/developer/1506451599) - Category: Lifestyle, Health & Fitness - Price: Free with in-app purchases - Rating: 4.80/5 from 5 App Store ratings · 16 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 153 MB - Languages: American English, Japanese - Released: 2023-07-18 - Data updated: 2026-08-28 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/miibook-journal-private-diary/id6451179720/reviews.md ## What is MiiBook Journal? MiiBook is your simple, personal diary app. We've made a conscious effort to provide a clean, engaging design that you won't tire of. Operation is easy, with no account registration required. Simply install the app and start using it immediately. 【Features】 ・Write a quick line or take your time ・Instant entry upon opening the app ・Easy reflections via calendar ・Switch calendar views by month ・Dark mode compatible ・Never forget to log with reminder notifications ・Only you have access to your data ・Home Widget ・AI automatically generates monthly summaries! ■ Write a quick line or take your time On busy days, jot down a single line. When you have time, write in detail. With the freedom to match your mood, keeping a daily diary is easier than ever. ■ Instant entry upon opening the app MiiBook is committed to a user-friendly experience. Tap the blank date field from the home screen and the keyboard appears for immediate input. ■ Easy reflections via calendar You can reflect on your diary entries in a calendar format. Reviewing past entries can help you recognize your personal growth and emotional changes. ■ Switch calendar views by month Simply swipe left or right to review your past records. ■ Dark mode compatible The app is friendly on the eyes and also supports dark mode. The theme switches according to your device settings. Enjoy the app in your favorite theme. ■ Never forget to log with reminder notifications Of course, reminder notifications are also supported. We support the habit of daily journaling with daily notifications. You can also turn off notifications. ■ Only you have access to your data Your journal entries are stored only on your device. Therefore, you can comfortably record your thoughts and feelings. 【Recommended for those who】 ・Felt other diary apps were complicated with unnecessary features. ・Want to use a simple diary app. ・Desire a diary app that they won't tire of. ・Prefer an app that allows quick and easy entries. ・Prioritize privacy and want their data stored only on their device. Terms of Use: https://tinylab-apps.web.app/TermsOfService/ja.html Privacy Policy: https://tinylab-apps.web.app/PrivacyPolicy/ja.html ## Key features - Instant entry upon opening - Calendar reflections - AI monthly summaries - Dark mode support - Reminder notifications - Home Widget - Local data storage ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | PREMIUM - MONTHLY | $1.99 | per month | | PREMIUM - ANNUAL | $22.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | PREMIUM - LIFETIME | $49.99 | one-time | ## Recent user reviews (10 of 16) All indexed reviews: https://appshunter.io/ios/app/miibook-journal-private-diary/id6451179720/reviews.md ### 5/5 — シンプルで美しい日記帳 *2026-01-30, version 6.2.0* シンプルで、美しく、色味とフォントが好き。一目惚れしたので買い切りプランで買ってしまいました。 大事に使い込み中です。 ### 1/5 — めちゃくちゃ携帯が熱くなる *2025-09-15, version 6.2.0* 前の方がよかったです。大幅なアプデがあってからアプリ起動すると携帯が物凄く熱くなるようになりました。おそらく熱さのせいで、日記を書いてるうちにどんどん動作が重くなっていきます。 ### 2/5 — バージョンアップして使いづらくなった *2025-03-19, version 6.2.0* 以前はワンタップで手軽に編集できたのに、バージョンアップしてから長押ししないとワンタップで編集できなかったり画面が切り替わるので手軽さがなくなりました。個人的には以前のUIに戻して頂きたいです ### 1/5 — アップデートが気に入らずアンスト *2025-03-03, version 6.2.0* 過去の記録が見れなくなっていた 残念 ### 2/5 — ウィジェットが課金制になって残念 *2025-02-13, version 6.2.0* アップデートでウィジェットが課金制になってしまい、残念です。ランダムに表示される日記を楽しみながら記入していたので、がっかりしました。 課金制ではなかったものが急に課金制になり、では購入しようと思いましたが8,000円はちょっと高すぎるので断念しました。また、写真を貼るからか容量の圧迫が増してしまうので外部保存できるとよかったと思います。 デザインも見やすく日記を書く楽しみを知れたので、アップデート前のこのアプリを知れてよかったです。 ### 4/5 — 前の方が良かった *2025-02-10, version 6.1.0* モド…シテ…… ### 4/5 — 自分を振り返る *2025-02-07, version 6.1.0* よく三日坊主になるのですが珍しく続いています！アイコンが変わってしまって前の方が良かったな、、、と。それか可愛いアイコンにしてほしいです！ ### 5/5 — シンプルでありがたい！写真が嬉しい！ *2025-01-20, version 5.1.0* 子育て日記に使っています。写真が残せるので1日の中で印象深い1シーンや、一言を残すのに最適で、重宝しています。見返すのが簡単なところがありがたいです。プレミアムにすると、CSVかPDFで出力できるようですが、どんな風に出力されるのでしょうか？検索しても見つけられませんでした。1年分くらい日記が溜まれば出力したいです。 ### 5/5 — 日記 *2024-11-22, version 5.1.0* シンプルで誰とも繋がらない。孤独な日記にちょうど良い ### 2/5 — たまにですが *2024-08-29, version 5.0.2* 3行くらい書きたい時もある ## Frequently asked questions about MiiBook Journal ### Does MiiBook Journal have ads? Yes, MiiBook Journal contains advertisements. These ads are displayed within the app to support its continued development and free availability. ### What are the subscription options for MiiBook Journal? MiiBook Journal offers two subscription plans: PREMIUM - MONTHLY at $1.99 per month and PREMIUM - ANNUAL at $22.99 per year. The annual plan includes a 14-day free trial. ### How is my data secured in MiiBook Journal? Your journal entries are stored exclusively on your device, ensuring that only you have access to your personal data. This local storage approach prioritizes user privacy and security. ### Can I use MiiBook Journal offline? Yes, MiiBook Journal is designed for offline use. Since all data is stored locally on your device, you can write and access your journal entries without an internet connection. ### How often is MiiBook Journal updated? MiiBook Journal was last updated on March 28, 2026, with version 6.2.2. This indicates a commitment to regular updates and improvements for the application. ### What devices is MiiBook Journal compatible with? MiiBook Journal is compatible with iPhone, iPad, and iPod devices. It is designed to run on Apple's iOS ecosystem. ### What is the age rating for MiiBook Journal? MiiBook Journal has an age rating of 4+. This means it is suitable for users of all ages, with no mature content restrictions. ### Does MiiBook Journal offer a free trial for its premium features? Yes, MiiBook Journal provides a 14-day free trial for its PREMIUM - ANNUAL subscription plan. This allows users to experience the full benefits of the premium features before committing to a purchase. ## Version history (last 5 releases) ### 6.2.2 — 2026-03-28 - Bug fixes and performance improvements. ### 6.2.1 — 2026-03-23 - Bug fixes and performance improvements. ### 6.2.0 — 2025-02-12 - Added new home screen widgets! - Bug fixes and performance improvements. ### 6.1.0 — 2025-02-07 - You can now favorite special journal entries. - Attach photos directly from the camera. - Various usability improvements. ### 6.0.0 — 2025-02-04 A timeless companion, always by your side. Introducing the all-new MiiBook, your reimagined journaling experience. [Update] - Rebuilt from the ground up as MiiBook. ## Apps similar to MiiBook Journal | App | Rating | Price | Category | | --- | --- | --- | --- | | [Daily Journal: Diary with Lock](https://appshunter.io/ios/app/daily-journal-diary-with-lock/id1605113008) | 4.8 (5,484) | Free | Lifestyle | | [My Diary with password & lock](https://appshunter.io/ios/app/my-diary-with-password-and-lock/id6467194692) | 4.7 (601) | Free | Lifestyle | | [Diarium Journal: Private Diary](https://appshunter.io/ios/app/diarium-journal-private-diary/id1436044299) | 4.8 (1,947) | Free | Lifestyle | | [My Daily Diary ‎](https://appshunter.io/ios/app/my-daily-diary/id1447344390) | 4.7 (1,126) | Free | Lifestyle | | [Daylio Journal - Mood Tracker](https://appshunter.io/ios/app/daylio-journal-mood-tracker/id1194023242) | 4.8 (61,304) | Free | Lifestyle | | [Diary, Journal, Notes - Diaro](https://appshunter.io/ios/app/diary-journal-notes-diaro/id882519460) | 4.7 (4,483) | Free | Lifestyle | ## More apps by Ryunosuke Nagase - [Subscription & Bill Manager](https://appshunter.io/ios/app/subscription-and-bill-manager/id1506451600) - [Rapid - Superfast To-Do List](https://appshunter.io/ios/app/rapid-superfast-to-do-list/id1511398926) - [Book Tracker Reading Log - Hon](https://appshunter.io/ios/app/book-tracker-reading-log-hon/id1516860157) - [推しPay - 推し活・推し事をまとめて管理。推して何日も。](https://appshunter.io/ios/app/pay/id1523768983) - [TubeNote - Note watching video](https://appshunter.io/ios/app/tubenote-note-watching-video/id1535634801) - [シンプル頭痛記録アプリ。片頭痛（偏頭痛）低気圧も - ミグル](https://appshunter.io/ios/app/id1564686045) All apps by Ryunosuke Nagase: https://appshunter.io/developer/1506451599 --- *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 2026-08-28.*