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