Compare software

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