# CM IOT Config vs 空气MQTT

The clearest difference is ads: CM IOT Config at none against 空气MQTT's shown. 空气MQTT's advantage is iOS requirement (12.0 vs 16.0). 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.

## The numbers

| Metric | CM IOT Config | 空气MQTT |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | — |
| Size | 67 MB | 32 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siemens AG](https://appshunter.io/developer/394503271) | [远大洁净空气科技有限公司](https://appshunter.io/developer/1510525132) |

## What reviewers say

### CM IOT Config

[App page](https://appshunter.io/ios/app/cm-iot-config/id1578297088)

**In-app purchases:** none


### 空气MQTT

[App page](https://appshunter.io/ios/app/mqtt/id6499257886)

**In-app purchases:** none


## Frequently asked questions

### Is CM IOT Config free?

CM IOT Config is free to download, with no in-app purchases.

### Is 空气MQTT free?

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

### Do CM IOT Config or 空气MQTT have ads?

空气MQTT shows ads; CM IOT Config does not.

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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.*