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mqtt-spy vs MQTT Explorer: catalog facts
mqtt-spy	MQTT Explorer
Free Free and open source under the Eclipse Public License.	Free Free and open source under the MIT licence.
Windows, Command line	Windows, macOS, Linux
Both a desktop interface and a headless daemon Focused on monitoring MQTT topic activity	Hierarchical topic tree with activity visualisation Diff view and per-topic history
No packaged releases on the GitHub repository Little recent development activity	Current version is still labelled beta Focused on inspection and debugging rather than broker administration
Downloadable app	Downloadable app
Open source	Open source
License: EPL-1.0	License: MIT
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.