# ATS MQTT Client vs SystemZen

The clearest difference is in-app purchases: ATS MQTT Client at none against SystemZen's 2. ATS MQTT Client also leads on ads (none vs shown) and iOS requirement (13.0 vs 17.0). SystemZen's advantage is update cadence (every 4 days vs every 7 months). On price and device support there is nothing between them.

Both are free to download. SystemZen sells 2 in-app purchases, starting at $9.99 per month. ATS MQTT Client asks for nothing beyond the download.

ATS MQTT Client ships an update every 7 months, SystemZen every 4 days. The most recent releases landed on September 25, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | ATS MQTT Client | SystemZen |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/ats-mqtt-client/id1485411018/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Every 4 days** |
| Monetization | Free | — |
| Size | 5 MB | 52 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [ATS sp.j.](https://appshunter.io/developer/1485411017) | [Fenul LLC](https://appshunter.io/developer/6776814911) |

## What reviewers say

### ATS MQTT Client

[App page](https://appshunter.io/ios/app/ats-mqtt-client/id1485411018)

Monitor and control devices connected to the mqtt.ats.pl service in real-time. Sign in with your account to access all your registered devices directly within the application.

**Highlights:** Real-time device monitoring, Device control, Integration with mqtt.ats.pl service, Account sign-in for device access, Supports iPhone, iPad, and iPod

**Features:** macOS Compatibility

**In-app purchases:** none


### SystemZen

[App page](https://appshunter.io/ios/app/systemzen-cleaner-and-storage/id6794717513)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SystemZen Pro Monthly | $9.99 | per month |
| SystemZen Pro Annual | $79.99 | per year |


## Frequently asked questions

### Is ATS MQTT Client free?

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

### Is SystemZen free?

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

### Do ATS MQTT Client or SystemZen have ads?

SystemZen shows ads; ATS MQTT Client does not.

### Which is updated more often, ATS MQTT Client or SystemZen?

ATS MQTT Client ships an update every 7 months, and SystemZen every 4 days. Most recently, ATS MQTT Client was updated on September 25, 2026 and SystemZen on October 29, 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.*