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Serpent vs RetroZilla: catalog facts
Serpent	RetroZilla
Free Free to download.	Free Free to download, with source code published on GitHub.
Windows	Windows
Runs on Windows XP and later Builds are GPG-signed for verification	Runs on Windows 95, 98, Me, NT 3.51 and NT 4.0 Improves web compatibility over the original Gecko 1.8.1 browsers
Unofficial builds with no upstream affiliation Distributed as archives in a bare file directory with no installer	Rendering is roughly at Firefox 2.0 level, so many modern sites will not work Does not target current versions of Windows
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	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 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.