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wormhole-william vs Tailcat: catalog facts
wormhole-william	Tailcat
Free Free and open source under the MIT licence.	Free Free and open source under the BSD-3-Clause licence.
Windows, Command line	Windows, Command line
End-to-end encrypted transfers paired by a short code Implements the magic wormhole protocol	No account, login or network setup needed Direct connections with relay fallback
Command-line only, no graphical interface Both sides must be online at the same time	No access policy or identity controls like a full tailnet Command line only
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: BSD-3-Clause
No account needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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