I just learned of this tool and downloaded for my iMac. Connected easily to a mosquitto broker on my RaspberryPi running rtl_433 software defined radio collecting input from a bunch of weather sensors around the house. The tool immediately parsed out all of the devices making it easy to see which message was from which device in real time. I plan to use this for several projects.

This app saved me hours of debugging on a new IoT device I was creating. All relevent MQTT parameters are displayed and the "diff" feature that compares the previous payload message with the current message is very useful. Hats off to developer Thomas Nordquist! What a great tool!!! If you are using MQTT clients and a broker and your desktop is a Mac, then this app is for you.

This is the best of the MQTT tools that I've found as far as functionality, but a few suggestions would get it to 5 stars:1) Could benefit from a few UI tweaks - for example, a) why is the "Advanced" tab a separate area - it should just be on the main screen. b) moving the graphs around should be drag/drop2) When the graphs are running it uses lots of GPU power. I have an external GPU (AMD Radeon RX580) and with 11 graphs running I'm consuming > 20% of the GPU capacity3) You should be able to save different "views" which would be combinations of graphs (maybe even in tabbed pages?)4) You should be able to make some simple transformations on the data (maybe adding two streams or dividing one stream by another) for display or export.

The swiss army knife for MQTT users. It is such an incredible time saver by allowing you to focus on the topics you care about while giving you a bird’s eye view of the broker at the same time. Not just that, but it’s also available on Mac, Windows, Ubuntu, Debian… Not to mention FREE! Can’t thank you enough, Thomas. You’re AWESOME!