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MQTT.fx vs MQTT CLI: catalog facts
MQTT.fx	MQTT CLI
Paid Commercial licence with a free trial.	Free Free and open source under the Apache 2.0 licence, backed by HiveMQ.
macOS	Windows, Command line
Tests broker connections without writing code Eclipse Sparkplug explorer and editor	Full MQTT 5.0 and 3.1.1 feature support Interactive shell with syntax highlighting and command history
Paid after the trial Free open-source MQTT clients cover basic use	Command line only, with no graphical interface Some commands only apply to HiveMQ brokers
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
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.