HiMemo2 vs Mugen AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HiMemo2
Organize information with a simple, hierarchical structure. Easily add, edit, and view data in a tree format, and export it to other apps. Syncs across Apple devices and is accessible on Apple Watch.
- Hierarchical data entry and management
- Cross-device sync (iPhone, iPad, Mac)
- Apple Watch browsing
- Enhanced search functionality
- Simple and intuitive UI
- Plain text and HTML export
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An enhanced version of HiMemo, an easy and convenient hierarchical memo app, is now available! For example, there is a surprising amount of information that has a hierarchical structure, such as information linked to regions and organizational charts. Normally, such information is recorded in bulleted list format in the memo app, but adding or editing information is surprisingly troublesome. Inadvertently, problems such as breaking the hierarchical relationship will occur. With HiMemo2, information can be recorded hierarchically with a simple operation like bulleted list format, and it is easy to add or modify. It is also possible to display a tree that gives a bird's-eye view of the whole, and to export information to other apps and SNS in plain text format or HTML format. Features of HiMemo2. - You can easily enter and manage data with a hierarchical structure. - Share data between multiple iPhones, iPads, Macs (sync with the same Apple ID). - You can browse the data on your Apple Watch. The following functions have been enhanced and improved from HiMemo. - Data is synchronized with HiMemo. - Linked with Apple Watch. You can browse the data on your Apple Watch. - The search function has been enhanced, and you can now search across memos. - The UI is simpler and easier to understand. Data will be inherited from HiMemo, so if you are using iOS 15 or later, we recommend migrating to HiMemo2.
Mugen AI
This AI assistant app makes advanced artificial intelligence accessible to everyone with a simple, intuitive interface. It offers over 10 practical AI functions, including translation, summarization, and idea generation, requiring no prior technical knowledge.
- Intuitive AI interface
- Translation in multiple languages
- Text summarization
- Grammar and style correction
- Idea generation
- Question answering
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AI power, made simple for everyone. With Mugen AI, advanced AI is easy to use—no specialist knowledge required. Mugen AI is an assistant app designed so anyone can experience the value of AI in a simple form. You don’t need to study prompts. Choose options and tap a button, and AI starts working for you right away. It includes more than 10 practical AI tools—translation, summarization, proofreading, Q&A, style conversion, idea generation, and more—so it can support your words and thinking like a helpful assistant by your side. For example: * Translation: Freely combine languages, from English and Japanese to French, Dutch, German, Tagalog, and more. * Summarization: Long text becomes clear and compact as AI captures the essentials. * Proofreading: Polish your writing from many angles with an AI eye for expression. * Style conversion: Change the tone of the same content to match the impression you want. * Idea generator: Break through creative blocks with fresh inspiration for planning and brainstorming. These are only a start. Mugen AI brings together practical know-how so more people can discover what AI can do. Download Mugen AI and try a simpler way to use AI in everyday life.
Screenshots
Verdict
The clearest difference is ads: HiMemo2 at none against Mugen AI's shown. HiMemo2 also leads on monetization model (free vs ad-supported) and device support (4 vs 2). Mugen AI's advantage is iOS requirement (18.0 vs 26.0). On price, review sentiment, update cadence and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
HiMemo2 ships an update monthly, Mugen AI every 3 weeks. The most recent releases landed on October 15, 2026 and October 12, 2026 respectively.
| Parameter | HiMemo2 | Mugen AI |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Update frequency | Monthly | Every 3 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, Mac, Apple Watch — better | iPhone, iPad |
| Requires iOS | 26.0 | 18.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Hiroyuki Kawai | Koichiro Kamada |
Customer experience
HiMemo2
Mugen AI
In-app purchases
HiMemo2
No in-app purchases
Mugen AI
No in-app purchases









