This is an MQTT client and test tool. MQTT is a machine-to-machine (M2M) messaging protocol commonly used for IoT applications. For more information on MQTT visit

MQTTool can connect to authenticated and unauthenticated MQTT brokers, subscribe to topics, and publish messages to topics.

I built this tool as i was doing my own MQTT investigations and I've posted it hoping others would find it useful too. I continue to use it on projects, and I'm continuing to look to improve this tool. If there are changes that would make this more useful, please send me feedback. Thanks!

What’s New

Version 2.6

MQTTool source has been released on GitHub.
See for more details.

This update includes some minor layout fixes.

Ratings and Reviews

4.7 out of 5
13 Ratings

13 Ratings

SoftJunkie ,

Does the job

I was looking for an iOS client to use for my Arduino experiments. I was able to interact with my Arduino device within 10 minutes of downloading this app. Very handy.

crash IOS9.1 ,

More function needed

Thanks for developing this app. Very handy. Is it possible add more function, such as sub multiple subjects and pub automatically

xstrex ,

Best MQTT tool available

Simple, reliable, easy to use, and most importantly, it just works!

One suggestion, add a topic collector, to dump all published topics on a broker, with the option to subscribe to a collected topic.


Brent Petit
18.7 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2019 Brent Petit


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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