# The 1 Book E vs Skybook E

The clearest difference is update cadence: The 1 Book E at every 5 months against Skybook E's every 30 months. The 1 Book E also leads on iOS requirement (10.0 vs 12.1). 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.

The 1 Book E ships an update every 5 months, Skybook E every 30 months. The most recent releases landed on September 27, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | The 1 Book E | Skybook E |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 30 months |
| Size | 128 MB | 12 MB |
| Requires iOS | **10.0** | 12.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +9 | 17+ |
| Developer | [MEB Corporation Public Company Limited](https://appshunter.io/developer/436964329) | [STAQ Technologies Co., Ltd.](https://appshunter.io/developer/506659247) |

## What reviewers say

### The 1 Book E

[App page](https://appshunter.io/ios/app/the-1-book-e-library/id1063235151)

**Features:** Vision Pro support

**In-app purchases:** none


### Skybook E

[App page](https://appshunter.io/ios/app/skybook-e-library/id1599065699)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is The 1 Book E free?

The 1 Book E is free to download, with no in-app purchases.

### Is Skybook E free?

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

### Do The 1 Book E or Skybook E have ads?

Neither The 1 Book E nor Skybook E shows ads.

### Which is updated more often, The 1 Book E or Skybook E?

The 1 Book E ships an update every 5 months, and Skybook E every 30 months. Most recently, The 1 Book E was updated on September 27, 2026 and Skybook E on September 30, 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.*