Compare software

websocatWebSocket King
Free

Free and open source.

 Free

Free to use in the browser.

Command line Web
  • Quick interactive testing of WebSocket endpoints
  • Works in pipes and shell scripts
  • Nothing to install
  • Focused on WebSocket testing and debugging
  • Command line only
  • Advanced options take time to learn
  • WebSockets only, not a general HTTP client
  • Little public documentation about its features
Downloadable app Web application
Open source Closed source
License not stated 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 September 23, 2026

Checked September 24, 2026

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