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MQTTX vs MQTT.fx: catalog facts
MQTTX	MQTT.fx
Free Free to download and use.	Paid Commercial licence with a free trial.
Windows, macOS, Linux, Web, Self-hosted, Command line	macOS
Desktop, CLI and web versions share one workflow Supports MQTT 5.0, 3.1.1 and 3.1	Tests broker connections without writing code Eclipse Sparkplug explorer and editor
Focused on MQTT only, not general HTTP APIs Some features steer toward the EMQX ecosystem	Paid after the trial Free open-source MQTT clients cover basic use
Downloadable app, Web application, Self-hosted	Downloadable app
Open source	Closed source
License not stated	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 September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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