# 帝國圖書館 vs ムー

The clearest difference is in-app purchases: 帝國圖書館 at none against ムー's 3. 帝國圖書館 also leads on update cadence (every 7 months vs every 40 months). ムー's advantage is iOS requirement (9.0 vs 12.0). On price, ads and device support there is nothing between them.

Both are free to download. ムー sells 3 in-app purchases, starting at $6.99 per month. 帝國圖書館 asks for nothing beyond the download.

帝國圖書館 ships an update every 7 months, ムー every 40 months. The most recent releases landed on October 24, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | 帝國圖書館 | ムー |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 72.2% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 40 months |
| Size | 11 MB | 21 MB |
| Requires iOS | 12.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Shin-ichi Nishimura](https://appshunter.io/developer/404706178) | [Gakken CO.,LTD](https://appshunter.io/developer/294791161) |

## What reviewers say

### 帝國圖書館

[App page](https://appshunter.io/ios/app/id963604056)

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

**In-app purchases:** none


### ムー

[App page](https://appshunter.io/ios/app/id1004467935)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| mu | $6.99 | per month |
| mu | $17.49 | per 3 months |
| mu | $33.99 | per 6 months |


## Frequently asked questions

### Is 帝國圖書館 free?

帝國圖書館 is free to download, with no in-app purchases.

### Is ムー free?

ムー is free to download, with in-app purchases available.

### Do 帝國圖書館 or ムー have ads?

Neither 帝國圖書館 nor ムー shows ads.

### Which is updated more often, 帝國圖書館 or ムー?

帝國圖書館 ships an update every 7 months, and ムー every 40 months. Most recently, 帝國圖書館 was updated on October 24, 2026 and ムー on November 1, 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.*