# AI文書スタイル変換 vs Mugen AI

The clearest difference is in-app purchases: Mugen AI at none against AI文書スタイル変換's 2. Mugen AI also leads on update cadence (every 3 weeks vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. AI文書スタイル変換 sells 2 one-off in-app purchases. Mugen AI asks for nothing beyond the download.

AI文書スタイル変換 ships an update every 4 months, Mugen AI every 3 weeks. The most recent releases landed on October 24, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | AI文書スタイル変換 | Mugen AI |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | — | Ad-supported |
| Size | 10 MB | 10 MB |
| Requires iOS | 18 | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 9+ | 4+ |
| Developer | [Osawa Shunsuke](https://appshunter.io/developer/477431394) | [Koichiro Kamada](https://appshunter.io/developer/476534292) |

## What reviewers say

### AI文書スタイル変換

[App page](https://appshunter.io/ios/app/ai/id6446862035)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 開発を支援する | $1.99 | one-time |
| Pro版 | $4.99 | one-time |


### Mugen AI

[App page](https://appshunter.io/ios/app/mugen-ai/id6740717908)

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.

**Highlights:** Intuitive AI interface, Translation in multiple languages, Text summarization, Grammar and style correction, Idea generation, Question answering

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is AI文書スタイル変換 free?

AI文書スタイル変換 is free to download, with in-app purchases available.

### Is Mugen AI free?

Mugen AI is free to download, with no in-app purchases.

### Do AI文書スタイル変換 or Mugen AI have ads?

Both AI文書スタイル変換 and Mugen AI show ads.

### Which is updated more often, AI文書スタイル変換 or Mugen AI?

AI文書スタイル変換 ships an update every 4 months, and Mugen AI every 3 weeks. Most recently, AI文書スタイル変換 was updated on October 24, 2026 and Mugen AI on November 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*