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MQTT Explorer vs MQTT.fx: catalog facts
MQTT Explorer	MQTT.fx
Free Free and open source under the MIT licence.	Paid Commercial licence with a free trial.
Windows, macOS, Linux	macOS
Hierarchical topic tree with activity visualisation Diff view and per-topic history	Tests broker connections without writing code Eclipse Sparkplug explorer and editor
Current version is still labelled beta Focused on inspection and debugging rather than broker administration	Paid after the trial Free open-source MQTT clients cover basic use
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account needed	Not stated if an account is 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.