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wscatHoppscotch
Free

Free and open source.

 Freemium

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

Command line Windows, macOS, Linux, Web, Self-hosted, Browser extension
  • Interactive WebSocket sessions in the terminal
  • Can act as a client or a listening server
  • Opens in a browser tab with nothing to install
  • HTTP, GraphQL, WebSocket, Server-Sent Events, Socket.IO and MQTT
  • Requires Node.js and npm
  • Plain text interface with no message history tools
  • 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, Downloadable app, Self-hosted, Browser extension
Open source Open source
License: MIT License: MIT
No account needed No account needed
Not stated if it works offline Works offline

Checked October 1, 2026

Checked September 21, 2026

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