TCP ModBus vs MQTT
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
TCP ModBus
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TCP Modbus - the application created for testing and debugging of systems supporting TCP ModBus protocol. Simulation sensors, send control commands, read data registers, and others. - Operation as a server or a client; - supports two modes slave and master; - reading and writing data register; - storage of the last session of the data; - storage connection settings; - support decrypting of incoming message.
MQTT
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The app has a control range with the ability to control between zero and five lights and doors, depending on the use case. By means of a red-green indicator, the user is shown the connection status of the server. In the settings area of the app the server connection details can be entered. Depending on the use case, the controls for the lights or doors can be switched on and off. For the individual lights and doors, the corresponding theme as well as the message can be set. In addition, further settings for the transmission can be selected.
Screenshots
Verdict
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.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
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.
| Parameter | TCP ModBus | MQTT |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 days โ better | Every 11 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod โ better | iPhone, iPod |
| Requires iOS | 8.0 โ better | 15.0 |
| Further details โ not scored | ||
| Size | 1 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | ะขะะฃ | Marco Gasser |
In-app purchases
TCP ModBus
No in-app purchases
MQTT
No in-app purchases








