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WebSocket King vs wscat: catalog facts
WebSocket King	wscat
Free Free to use in the browser.	Free Free and open source.
Web	Command line
Nothing to install Focused on WebSocket testing and debugging	Interactive WebSocket sessions in the terminal Can act as a client or a listening server
WebSockets only, not a general HTTP client Little public documentation about its features	Requires Node.js and npm Plain text interface with no message history tools
Web application	Downloadable app
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	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 1, 2026

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