# 39Tools vs MQTT Checker

The clearest difference is update cadence: MQTT Checker at monthly against 39Tools's every 9 months. 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.

39Tools ships an update every 9 months, MQTT Checker monthly. The most recent releases landed on October 27, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | 39Tools | MQTT Checker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Monthly** |
| Size | 112 MB | 38 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [策 王](https://appshunter.io/developer/1681706231) | [DreamNexus](https://appshunter.io/developer/1602135238) |

## What reviewers say

### 39Tools

[App page](https://appshunter.io/ios/app/39tools/id6447797534)

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

**In-app purchases:** none


### MQTT Checker

[App page](https://appshunter.io/ios/app/mqtt-checker-mqtt-connection/id6450397057)

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

**In-app purchases:** none


## Frequently asked questions

### Is 39Tools free?

39Tools is free to download, with no in-app purchases.

### Is MQTT Checker free?

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

### Do 39Tools or MQTT Checker have ads?

Neither 39Tools nor MQTT Checker shows ads.

### Which is updated more often, 39Tools or MQTT Checker?

39Tools ships an update every 9 months, and MQTT Checker monthly. Most recently, 39Tools was updated on October 27, 2026 and MQTT Checker on October 12, 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.*