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WebSocket KingHoppscotch
Free

Free to use in the browser.

 Freemium

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

Web Windows, macOS, Linux, Web, Self-hosted, Browser extension
  • Nothing to install
  • Focused on WebSocket testing and debugging
  • Opens in a browser tab with nothing to install
  • HTTP, GraphQL, WebSocket, Server-Sent Events, Socket.IO and MQTT
  • WebSockets only, not a general HTTP client
  • Little public documentation about its features
  • The browser version needs an extension or the desktop app to reach local services
  • Team collaboration features are the paid part
Web application Web application, Downloadable app, Self-hosted, Browser extension
Closed source Open source
License not stated License: MIT
Not stated if an account is 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.