# SSCI E vs Skybook E

The clearest difference is update cadence: SSCI E at every 9 days against Skybook E's every 30 months. SSCI E also leads on iOS requirement (7.0 vs 12.1). Skybook E's advantage is device support (3 vs 1). On price, ads and in-app purchases there is nothing between them.

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

SSCI E ships an update every 9 days, Skybook E every 30 months. The most recent releases landed on October 18, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | SSCI E | Skybook E |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 30 months |
| Size | 8 MB | 12 MB |
| Requires iOS | **7.0** | 12.1 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [The Institute for the Promotion of Teaching Science and Technology (IPST)](https://appshunter.io/developer/643591471) | [STAQ Technologies Co., Ltd.](https://appshunter.io/developer/506659247) |

## What reviewers say

### SSCI E

[App page](https://appshunter.io/ios/app/ssci-e-book/id1023332919)

**Features:** macOS Compatibility

**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 SSCI E free?

SSCI 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 SSCI E or Skybook E have ads?

Neither SSCI E nor Skybook E shows ads.

### Which is updated more often, SSCI E or Skybook E?

SSCI E ships an update every 9 days, and Skybook E every 30 months. Most recently, SSCI E was updated on October 18, 2026 and Skybook E on October 15, 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.*