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r3dfox vs Serpent: catalog facts
r3dfox	Serpent
Free Free and open source, based on Firefox's Mozilla Public License code.	Free Free to download.
Windows	Windows
Runs a current Firefox engine on Windows Vista and 7 Follows recent Firefox releases	Runs on Windows XP and later Builds are GPG-signed for verification
Small community project dependent on a few maintainers Windows only	Unofficial builds with no upstream affiliation Distributed as archives in a bare file directory with no installer
Downloadable app	Downloadable app
Open source	Closed source
License: MPL-2.0	License not stated
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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