# VAA9 vs 燃气安全市民通

The clearest difference is update cadence: 燃气安全市民通 at every 2 weeks against VAA9's every 6 weeks. On price, ads, 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.

VAA9 ships an update every 6 weeks, 燃气安全市民通 every 2 weeks. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | VAA9 | 燃气安全市民通 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Size | 62 MB | 38 MB |
| Requires iOS | 12.2 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [国强 孙](https://appshunter.io/developer/1051177733) | [Hebei Keyi Wisdom Energy Development Co., Ltd.](https://appshunter.io/developer/1586933335) |

## What reviewers say

### VAA9

[App page](https://appshunter.io/ios/app/vaa9/id1228471182)

**Features:** macOS Compatibility

**In-app purchases:** none


### 燃气安全市民通

[App page](https://appshunter.io/ios/app/id6482993034)

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

**In-app purchases:** none


## Frequently asked questions

### Is VAA9 free?

VAA9 is free to download, with no in-app purchases.

### Is 燃气安全市民通 free?

燃气安全市民通 is free to download, with no in-app purchases.

### Do VAA9 or 燃气安全市民通 have ads?

Neither VAA9 nor 燃气安全市民通 shows ads.

### Which is updated more often, VAA9 or 燃气安全市民通?

VAA9 ships an update every 6 weeks, and 燃气安全市民通 every 2 weeks. Most recently, VAA9 was updated on November 2, 2026 and 燃气安全市民通 on November 4, 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.*