# 数字图书馆 vs 屏卫PRO

The clearest difference is update cadence: 屏卫PRO at every 4 days against 数字图书馆's every 2 months. 数字图书馆's advantage is iOS requirement (9.0 vs 17.0). 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.

数字图书馆 ships an update every 2 months, 屏卫PRO every 4 days. The most recent releases landed on October 26, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | 数字图书馆 | 屏卫PRO |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Size | 66 MB | 10 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Beijing Huayue Jiacheng Technology Development Co., Ltd.](https://appshunter.io/developer/1478105989) | [Shenzhen Zhengyilong Technology Co.,Ltd](https://appshunter.io/developer/932771087) |

## What reviewers say

### 数字图书馆

[App page](https://appshunter.io/ios/app/id1308238231)

**In-app purchases:** none


### 屏卫PRO

[App page](https://appshunter.io/ios/app/pro/id6812643787)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 数字图书馆 free?

数字图书馆 is free to download, with no in-app purchases.

### Is 屏卫PRO free?

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

### Do 数字图书馆 or 屏卫PRO have ads?

Neither 数字图书馆 nor 屏卫PRO shows ads.

### Which is updated more often, 数字图书馆 or 屏卫PRO?

数字图书馆 ships an update every 2 months, and 屏卫PRO every 4 days. Most recently, 数字图书馆 was updated on October 26, 2026 and 屏卫PRO on October 29, 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.*