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mqtt-spyMQTTX
Free

Free and open source under the Eclipse Public License.

 Free

Free to download and use.

Windows, Command line Windows, macOS, Linux, Web, Self-hosted, Command line
  • Both a desktop interface and a headless daemon
  • Focused on monitoring MQTT topic activity
  • Desktop, CLI and web versions share one workflow
  • Supports MQTT 5.0, 3.1.1 and 3.1
  • No packaged releases on the GitHub repository
  • Little recent development activity
  • Focused on MQTT only, not general HTTP APIs
  • Some features steer toward the EMQX ecosystem
Downloadable app Downloadable app, Web application, Self-hosted
Open source Open source
License: EPL-1.0 License not stated
No account needed No account needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked September 24, 2026

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