# 文件预览助手 vs 无痕应用锁

The clearest difference is in-app purchases: 文件预览助手 at none against 无痕应用锁's 5. 文件预览助手 also leads on update cadence (every 2 weeks vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 无痕应用锁 sells 4 one-off in-app purchases. 文件预览助手 asks for nothing beyond the download.

文件预览助手 ships an update every 2 weeks, 无痕应用锁 every 3 weeks. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 文件预览助手 | 无痕应用锁 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Size | 56 MB | 34 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [北京创效未来](https://appshunter.io/developer/1714229626) | [宝顺 田](https://appshunter.io/developer/1883078582) |

## What reviewers say

### 文件预览助手

[App page](https://appshunter.io/ios/app/120-plus/id6761652430)

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

**In-app purchases:** none


### 无痕应用锁

[App page](https://appshunter.io/ios/app/id6772986354)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 一杯咖啡 | $0.99 | one-time |
| 两杯咖啡 | $1.99 | one-time |
| 简单午餐 | $2.99 | one-time |
| 丰盛晚餐 | $3.99 | one-time |


## Frequently asked questions

### Is 文件预览助手 free?

文件预览助手 is free to download, with no in-app purchases.

### Is 无痕应用锁 free?

无痕应用锁 is free to download, with in-app purchases available.

### Do 文件预览助手 or 无痕应用锁 have ads?

Neither 文件预览助手 nor 无痕应用锁 shows ads.

### Which is updated more often, 文件预览助手 or 无痕应用锁?

文件预览助手 ships an update every 2 weeks, and 无痕应用锁 every 3 weeks. Most recently, 文件预览助手 was updated on October 28, 2026 and 无痕应用锁 on October 25, 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.*