# System 911 vs 全屏时钟

The clearest difference is ads: System 911 at none against 全屏时钟's shown. System 911 also leads on iOS requirement (9 vs 16). 全屏时钟's advantage is update cadence (daily vs every 6 weeks). On price, 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.

System 911 ships an update every 6 weeks, 全屏时钟 daily. Both last shipped on October 25, 2026.

## The numbers

| Metric | System 911 | 全屏时钟 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Daily** |
| Size | 29 MB | 15 MB |
| Requires iOS | **9** | 16 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [学新 黄](https://appshunter.io/developer/1450715299) | [子幸 聂](https://appshunter.io/developer/1881766687) |

## What reviewers say

### System 911

[App page](https://appshunter.io/ios/app/system-911/id1497419202)

**Features:** macOS Compatibility

**In-app purchases:** none


### 全屏时钟

[App page](https://appshunter.io/ios/app/id6760887937)

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

**In-app purchases:** none


## Frequently asked questions

### Is System 911 free?

System 911 is free to download, with no in-app purchases.

### Is 全屏时钟 free?

全屏时钟 is free to download, with no in-app purchases.

### Do System 911 or 全屏时钟 have ads?

全屏时钟 shows ads; System 911 does not.

### Which is updated more often, System 911 or 全屏时钟?

System 911 ships an update every 6 weeks, and 全屏时钟 daily. Most recently, System 911 was updated on October 25, 2026 and 全屏时钟 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.*