# TCP ModBus vs MQTT

The clearest difference is update cadence: TCP ModBus at every 4 days against MQTT's every 11 months. TCP ModBus also leads on iOS requirement (8.0 vs 15.0). 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.

TCP ModBus ships an update every 4 days, MQTT every 11 months. The most recent releases landed on September 27, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | TCP ModBus | MQTT |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 11 months |
| Size | 1 MB | 2 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ТПУ](https://appshunter.io/developer/1004522612) | [Marco Gasser](https://appshunter.io/developer/1625108046) |

## What reviewers say

### TCP ModBus

[App page](https://appshunter.io/ios/app/tcp-modbus/id1167945569)

**Features:** macOS Compatibility

**In-app purchases:** none


### MQTT

[App page](https://appshunter.io/ios/app/mqtt-client/id6443841176)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is TCP ModBus free?

TCP ModBus is free to download, with no in-app purchases.

### Is MQTT free?

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

### Do TCP ModBus or MQTT have ads?

Neither TCP ModBus nor MQTT shows ads.

### Which is updated more often, TCP ModBus or MQTT?

TCP ModBus ships an update every 4 days, and MQTT every 11 months. Most recently, TCP ModBus was updated on September 27, 2026 and MQTT on September 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.*