# 空气MQTT vs Queen Tech

The clearest difference is ads: Queen Tech at none against 空气MQTT's shown. 空气MQTT's advantage is iOS requirement (12.0 vs 15.6). 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 | 空气MQTT | Queen Tech |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | — | Every 7 months |
| Size | 32 MB | 204 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [远大洁净空气科技有限公司](https://appshunter.io/developer/1510525132) | [Shanghai Siseli New Energy Cooperative Enterprise](https://appshunter.io/developer/1673700559) |

## What reviewers say

### 空气MQTT

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

**In-app purchases:** none


### Queen Tech

[App page](https://appshunter.io/ios/app/queen-tech/id6749222638)

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

**In-app purchases:** none


## Frequently asked questions

### Is 空气MQTT free?

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

### Is Queen Tech free?

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

### Do 空气MQTT or Queen Tech have ads?

空气MQTT shows ads; Queen Tech 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.*