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mqtt-spy vs MQTT CLI: catalog facts
mqtt-spy	MQTT CLI
Free Free and open source under the Eclipse Public License.	Free Free and open source under the Apache 2.0 licence, backed by HiveMQ.
Windows, Command line	Windows, Command line
Both a desktop interface and a headless daemon Focused on monitoring MQTT topic activity	Full MQTT 5.0 and 3.1.1 feature support Interactive shell with syntax highlighting and command history
No packaged releases on the GitHub repository Little recent development activity	Command line only, with no graphical interface Some commands only apply to HiveMQ brokers
Downloadable app	Downloadable app
Open source	Open source
License: EPL-1.0	License: Apache-2.0
No account 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.