# 51连环 vs BookShelf Library Book Manager

The clearest difference is in-app purchases: 51连环 at none against BookShelf Library Book Manager's 3. 51连环 also leads on iOS requirement (8.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. BookShelf Library Book Manager sells 3 in-app purchases, starting at $2.99 per year. 51连环 asks for nothing beyond the download.

## The numbers

| Metric | 51连环 | BookShelf Library Book Manager |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Daily | — |
| Size | 30 MB | 21 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [上海曜宁信息科技有限公司](https://appshunter.io/developer/1271993596) | [磊 刘](https://appshunter.io/developer/1892400556) |

## What reviewers say

### 51连环

[App page](https://appshunter.io/ios/app/51/id6502535452)

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

**In-app purchases:** none


### BookShelf Library Book Manager

[App page](https://appshunter.io/ios/app/bookshelf-library-book-manager/id6796593219)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Shuge PRO — Yearly | $2.99 | per year |
| Shuge PRO — 1 Year | $3.99 | one-time |
| Shuge PRO — Lifetime | $4.99 | one-time |


## Frequently asked questions

### Is 51连环 free?

51连环 is free to download, with no in-app purchases.

### Is BookShelf Library Book Manager free?

BookShelf Library Book Manager is free to download, with in-app purchases available.

### Do 51连环 or BookShelf Library Book Manager have ads?

Neither 51连环 nor BookShelf Library Book Manager shows ads.

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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.*