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socat vs Tailcat: catalog facts
socat	Tailcat
Free Free and open source under the GPL.	Free Free and open source under the BSD-3-Clause licence.
macOS, Linux, Command line	Windows, Command line
Connects almost any pair of endpoints, including TLS and serial devices Handles forking servers and complex options netcat cannot	No account, login or network setup needed Direct connections with relay fallback
The address syntax is dense and unforgiving The project site is served over plain HTTP only, so the repository is linked here instead	No access policy or identity controls like a full tailnet Command line only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: BSD-3-Clause
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

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