# 修猫补光灯 vs PDF File Protector

The clearest difference is price: 修猫补光灯 at Free against PDF File Protector's $19.99. 修猫补光灯 also leads on in-app purchases (none vs 1) and update cadence (daily vs every 2 months). PDF File Protector's advantage is ads (none vs shown). On device support there is nothing between them.

修猫补光灯 is free to download; PDF File Protector costs $19.99 up front. PDF File Protector sells 1 one-off in-app purchase. 修猫补光灯 asks for nothing beyond the download.

修猫补光灯 ships an update daily, PDF File Protector every 2 months. The most recent releases landed on October 13, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 修猫补光灯 | PDF File Protector |
| --- | --- | --- |
| Price | **Free** | $19.99 |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Daily** | Every 2 months |
| Size | 14 MB | 7 MB |
| Requires iOS | **12.0** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [宗仁 李](https://appshunter.io/developer/924915319) | [乐祥 胡](https://appshunter.io/developer/1572365721) |

## What reviewers say

### 修猫补光灯

[App page](https://appshunter.io/ios/app/id6738048086)

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

**In-app purchases:** none


### PDF File Protector

[App page](https://appshunter.io/ios/app/pdf-file-protector/id6738285744)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| pdf签名内购 | $9.99 | one-time |


## Frequently asked questions

### Is 修猫补光灯 free?

修猫补光灯 is free to download, with no in-app purchases.

### Is PDF File Protector free?

PDF File Protector costs $19.99, and also offers in-app purchases.

### Do 修猫补光灯 or PDF File Protector have ads?

修猫补光灯 shows ads; PDF File Protector does not.

### Which is updated more often, 修猫补光灯 or PDF File Protector?

修猫补光灯 ships an update daily, and PDF File Protector every 2 months. Most recently, 修猫补光灯 was updated on October 13, 2026 and PDF File Protector on October 24, 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.*