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Serpent vs Basilisk: catalog facts
Serpent	Basilisk
Free Free to download.	Free The open-source application is available without a license fee.
Windows	Windows, macOS, Linux
Runs on Windows XP and later Builds are GPG-signed for verification	Runs classic XUL extensions that no current browser supports Independent of Chromium and of current Firefox
Unofficial builds with no upstream affiliation Distributed as archives in a bare file directory with no installer	Small development team, so security fixes and web compatibility lag Many modern sites do not work correctly
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MPL-2.0
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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