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MQTT ExplorerMQTTy
Free

Free and open source under the MIT licence.

 Free

Free and open source under the GPL-3.0 license.

Windows, macOS, Linux Windows, Linux
  • Hierarchical topic tree with activity visualisation
  • Diff view and per-topic history
  • Publishes messages and subscribes to MQTT topics
  • Supports multiple connections in separate tabs
  • Current version is still labelled beta
  • Focused on inspection and debugging rather than broker administration
  • Requires access to an MQTT broker
Downloadable app Downloadable app
Open source Open source
License: MIT License: GPL-3.0
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked October 8, 2026

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