# Book vs CyberWolf Service

The clearest difference is update cadence: Book at every 3 days against CyberWolf Service's every 2 weeks. Book also leads on iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Book ships an update every 3 days, CyberWolf Service every 2 weeks. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Book | CyberWolf Service |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 2 weeks |
| Size | 38 MB | 140 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Marlenus, LLC](https://appshunter.io/developer/1780343114) | [Cyber Wolf Sites LLC](https://appshunter.io/developer/1875067397) |

## What reviewers say

### Book

[App page](https://appshunter.io/ios/app/book-me/id6738625204)

**Features:** macOS Compatibility

**In-app purchases:** none


### CyberWolf Service

[App page](https://appshunter.io/ios/app/cyberwolf-service/id6758789744)

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

**In-app purchases:** none


## Frequently asked questions

### Is Book free?

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

### Is CyberWolf Service free?

CyberWolf Service is free to download, with no in-app purchases.

### Do Book or CyberWolf Service have ads?

Neither Book nor CyberWolf Service shows ads.

### Which is updated more often, Book or CyberWolf Service?

Book ships an update every 3 days, and CyberWolf Service every 2 weeks. Most recently, Book was updated on October 30, 2026 and CyberWolf Service on October 31, 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.*