Compare software

wscatWebSocket King
Free

Free and open source.

 Free

Free to use in the browser.

Command line Web
  • Interactive WebSocket sessions in the terminal
  • Can act as a client or a listening server
  • Nothing to install
  • Focused on WebSocket testing and debugging
  • Requires Node.js and npm
  • Plain text interface with no message history tools
  • WebSockets only, not a general HTTP client
  • Little public documentation about its features
Downloadable app Web application
Open source Closed source
License: MIT License not stated
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 1, 2026

Checked September 24, 2026

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