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MQTTXHoppscotch
Free

Free to download and use.

 Freemium

Free and open source under the MIT licence, including self-hosting. A paid cloud plan…

Windows, macOS, Linux, Web, Self-hosted, Command line Windows, macOS, Linux, Web, Self-hosted, Browser extension
  • Desktop, CLI and web versions share one workflow
  • Supports MQTT 5.0, 3.1.1 and 3.1
  • Opens in a browser tab with nothing to install
  • HTTP, GraphQL, WebSocket, Server-Sent Events, Socket.IO and MQTT
  • Focused on MQTT only, not general HTTP APIs
  • Some features steer toward the EMQX ecosystem
  • The browser version needs an extension or the desktop app to reach local services
  • Team collaboration features are the paid part
Downloadable app, Web application, Self-hosted Web application, Downloadable app, Self-hosted, Browser extension
Open source Open source
License not stated License: MIT
No account needed No account needed
Not stated if it works offline Works offline

Checked September 24, 2026

Checked September 21, 2026

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