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

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