MiiBook Journal vs Plan Universe
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MiiBook Journal
This personal diary app offers a clean and engaging interface for easy daily journaling. It allows for quick entries, calendar reflections, and automatic monthly summaries, with a strong emphasis on user privacy as all data is stored locally.
- Instant entry upon opening
- Calendar reflections
- AI monthly summaries
- Reminder notifications
- Dark mode compatible
- Home Widget
- Local data storage
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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
Plan Universe
Visualize your goals and tasks as interactive mind maps. Generate plans using AI, organize with drag-and-drop functionality, and stay on track with a dedicated 'Today' view. Your data remains private, stored on your device and synced via iCloud.
- Goal-based mind map generation
- Drag-and-drop branch organization
- AI-assisted plan breakdown
- On-device data processing
- Integrated 'Today' task view
- iCloud synchronization
- Attachment support (photos, PDFs)
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Most planning apps hand you a list. Plan Universe hands you a map. Describe a goal in your own words and watch it become a mind map of sections and tasks — drafted entirely on your device. PLAN ON A CANVAS, NOT IN A LIST • Every plan opens as a mind map. Goals branch into sections, sections into tasks, nested as deep as the work actually goes. • Drag a branch and its whole subtree follows, so rearranging a plan feels like moving furniture rather than editing rows. • Tap any node to edit it right where it sits. The map stays put around you. LET APPLE INTELLIGENCE DO THE BREAKDOWN • Say what you want to achieve and get back a structured plan, ready to edit. • Attach photos or PDFs when the context matters — a syllabus, a brief, a photo of a whiteboard. • It all runs on device. Your plans are never sent to us, and never used to train anything. STAY ON TOP OF WHAT'S DUE • The Today tab gathers every task from every plan, in deadline order. • Reminders arrive the morning a task is due, so nothing slips quietly. • Jump from any task straight to its place on the map, with the plan open around it. KEEP IT ALL, KEEP IT PRIVATE • Plans sync through your own iCloud account, so a new iPhone picks up exactly where the last one left off. • Your data lives on your device and in your private iCloud. We have no access to it. Plan generation requires an iPhone with Apple Intelligence enabled. Everything else works on any supported iPhone. PLAN UNIVERSE PRO The free version includes 2 plans. Pro removes the limit, monthly or yearly. Subscriptions renew automatically until canceled; manage them anytime in Settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://mustafanatur.github.io/plan-universe-privacy/ Start with one goal. See where it branches.
Screenshots
Verdict
The clearest difference is ads: Plan Universe at none against MiiBook Journal's shown. Plan Universe also leads on update cadence (every 4 days vs monthly) and rating (5.0 vs 4.8). MiiBook Journal's advantage is ratings volume (5 vs 1) and iOS requirement (15.0 vs 27.1). On price, in-app purchases, monetization model and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. MiiBook Journal sells 3 in-app purchases, starting at $1.99 per month and Plan Universe sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
Plan Universe holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: MiiBook Journal has 5 ratings behind it against 1, so its average is the more settled of the two.
MiiBook Journal ships an update monthly, Plan Universe every 4 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.
| Parameter | MiiBook Journal | Plan Universe |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (5 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 62.5% of reviews | — |
| Number of ratings | 5 — better | 1 |
| Update frequency | Monthly | Every 4 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 27.1 |
| Further details — not scored | ||
| Size | 139 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Ryunosuke Nagase | Mustafa Natur |
Customer experience
MiiBook Journal
Plan Universe
In-app purchases
MiiBook Journal
- PREMIUM - MONTHLY$1.991 Month
- PREMIUM - ANNUAL14 Days trial$22.991 Year
- PREMIUM - LIFETIME$49.99
Plan Universe
- Pro Monthly$2.991 Month
- Pro Yearly$19.991 Year









