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MQTTX vs mqtt-spy: catalog facts
MQTTX	mqtt-spy
Free Free to download and use.	Free Free and open source under the Eclipse Public License.
Windows, macOS, Linux, Web, Self-hosted, Command line	Windows, Command line
Desktop, CLI and web versions share one workflow Supports MQTT 5.0, 3.1.1 and 3.1	Both a desktop interface and a headless daemon Focused on monitoring MQTT topic activity
Focused on MQTT only, not general HTTP APIs Some features steer toward the EMQX ecosystem	No packaged releases on the GitHub repository Little recent development activity
Downloadable app, Web application, Self-hosted	Downloadable app
Open source	Open source
License not stated	License: EPL-1.0
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 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.