# 防骚扰大师 vs USim OS

The clearest difference is price: USim OS at Free against 防骚扰大师's $0.99. USim OS also leads on update cadence (weekly vs every 5 weeks) and iOS requirement (13.0 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

USim OS is free to download; 防骚扰大师 costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

防骚扰大师 ships an update every 5 weeks, USim OS weekly. The most recent releases landed on September 8, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | 防骚扰大师 | USim OS |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Weekly** |
| Size | 4 MB | 77 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [合肥章玉智能科技有限公司](https://appshunter.io/developer/1189870243) | [Ruiyu Chen](https://appshunter.io/developer/1762343435) |

## What reviewers say

### 防骚扰大师

[App page](https://appshunter.io/ios/app/id6445937673)

**In-app purchases:** none


### USim OS

[App page](https://appshunter.io/ios/app/usim-os/id6740407423)

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

**In-app purchases:** none


## Frequently asked questions

### Is 防骚扰大师 free?

防骚扰大师 costs $0.99, with no in-app purchases.

### Is USim OS free?

USim OS is free to download, with no in-app purchases.

### Do 防骚扰大师 or USim OS have ads?

Neither 防骚扰大师 nor USim OS shows ads.

### Which is updated more often, 防骚扰大师 or USim OS?

防骚扰大师 ships an update every 5 weeks, and USim OS weekly. Most recently, 防骚扰大师 was updated on September 8, 2026 and USim OS on September 16, 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.*