# SimpleTestTracker vs MQTT Developer

The clearest difference is in-app purchases: MQTT Developer at none against SimpleTestTracker's 1. MQTT Developer also leads on iOS requirement (13.0 vs 17.4). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. SimpleTestTracker sells 1 one-off in-app purchase. MQTT Developer asks for nothing beyond the download.

SimpleTestTracker ships an update every 2 months, MQTT Developer every 3 months. The most recent releases landed on May 19, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | SimpleTestTracker | MQTT Developer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Size | 6 MB | 52 MB |
| Requires iOS | 17.4 | **13.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Matthias Santer](https://appshunter.io/developer/1538440760) | [Patrick West](https://appshunter.io/developer/1560984117) |

## What reviewers say

### SimpleTestTracker

[App page](https://appshunter.io/ios/app/simpletesttracker/id6446170999)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $12.99 | one-time |


### MQTT Developer

[App page](https://appshunter.io/ios/app/mqtt-developer/id6505110467)

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

**In-app purchases:** none


## Frequently asked questions

### Is SimpleTestTracker free?

SimpleTestTracker is free to download, with in-app purchases available.

### Is MQTT Developer free?

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

### Do SimpleTestTracker or MQTT Developer have ads?

Neither SimpleTestTracker nor MQTT Developer shows ads.

### Which is updated more often, SimpleTestTracker or MQTT Developer?

SimpleTestTracker ships an update every 2 months, and MQTT Developer every 3 months. Most recently, SimpleTestTracker was updated on May 19, 2026 and MQTT Developer on September 10, 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.*