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MQTT ExplorerMQTTX
Free

Free and open source under the MIT licence.

 Free

Free to download and use.

Windows, macOS, Linux Windows, macOS, Linux, Web, Self-hosted, Command line
  • Hierarchical topic tree with activity visualisation
  • Diff view and per-topic history
  • Desktop, CLI and web versions share one workflow
  • Supports MQTT 5.0, 3.1.1 and 3.1
  • Current version is still labelled beta
  • Focused on inspection and debugging rather than broker administration
  • 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: MIT 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.