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websocat vs Packet Sender: catalog facts
websocat	Packet Sender
Free Free and open source.	Free Free and open source, with no ads or bundled software.
Command line	Windows, macOS, Linux, Command line
Quick interactive testing of WebSocket endpoints Works in pipes and shell scripts	Sends and receives TCP, UDP, SSL and DTLS Command-line tool for scripted tests
Command line only Advanced options take time to learn	Low-level tool that assumes some networking knowledge Panel generator is aimed at control systems, a niche use
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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