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MQTT.fx vs MQTT5 Explorer: catalog facts
MQTT.fx	MQTT5 Explorer
Paid Commercial licence with a free trial.	Free Free and open source under the GPL-3.0 licence.
macOS	Linux
Tests broker connections without writing code Eclipse Sparkplug explorer and editor	Aims to support all MQTT 5 features Works with any MQTT broker
Paid after the trial Free open-source MQTT clients cover basic use	Small project with a limited community Release activity is not clear from the repository page
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-only
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.