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MQTT.fx vs MQTT Explorer: catalog facts
MQTT.fx	MQTT Explorer
Paid Commercial licence with a free trial.	Free Free and open source under the MIT licence.
macOS	Windows, macOS, Linux
Tests broker connections without writing code Eclipse Sparkplug explorer and editor	Hierarchical topic tree with activity visualisation Diff view and per-topic history
Paid after the trial Free open-source MQTT clients cover basic use	Current version is still labelled beta Focused on inspection and debugging rather than broker administration
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
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 2, 2026

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