# 上海北京广州成都沈阳空气质量 vs World Clock, Map

The clearest difference is ads: 上海北京广州成都沈阳空气质量 at none against World Clock, Map's shown. 上海北京广州成都沈阳空气质量 also leads on iOS requirement (7.0 vs 17.0). World Clock, Map's advantage is update cadence (every 4 days vs every 2 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.

上海北京广州成都沈阳空气质量 ships an update every 2 weeks, World Clock, Map every 4 days. Both last shipped on October 14, 2026.

## The numbers

| Metric | 上海北京广州成都沈阳空气质量 | World Clock, Map |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Size | 37 MB | 26 MB |
| Requires iOS | **7.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [懿俊 梁](https://appshunter.io/developer/530075375) | [Taisuke Hosokawa](https://appshunter.io/developer/1585548762) |

## What reviewers say

### 上海北京广州成都沈阳空气质量

[App page](https://appshunter.io/ios/app/id1185458811)

**Features:** macOS Compatibility

**In-app purchases:** none


### World Clock, Map

[App page](https://appshunter.io/ios/app/world-clock-map/id6738603107)

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

**In-app purchases:** none


## Frequently asked questions

### Is 上海北京广州成都沈阳空气质量 free?

上海北京广州成都沈阳空气质量 is free to download, with no in-app purchases.

### Is World Clock, Map free?

World Clock, Map is free to download, with no in-app purchases.

### Do 上海北京广州成都沈阳空气质量 or World Clock, Map have ads?

World Clock, Map shows ads; 上海北京广州成都沈阳空气质量 does not.

### Which is updated more often, 上海北京广州成都沈阳空气质量 or World Clock, Map?

上海北京广州成都沈阳空气质量 ships an update every 2 weeks, and World Clock, Map every 4 days. Most recently, 上海北京广州成都沈阳空气质量 was updated on October 14, 2026 and World Clock, Map on October 14, 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.*