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Flauth vs 2FAS: catalog facts
Flauth	2FAS
Free Free and open source under the MIT licence.	Free Free and open source. Some components are source-available.
Windows, macOS, Linux, Android, Command line	Android, iOS, Browser extension
Same authenticator on Android and all three desktop systems Command-line tool for reading codes in a terminal	Browser extension approves codes on the phone instead of typing them Encrypted backups to your own iCloud or Google Drive account
Small, young project with a single main developer No iOS app listed among the downloads	Mobile-first; there is no standalone desktop app Push approval needs the browser extension installed on each machine
Downloadable app	Downloadable app, Browser extension
Open source	Open source
License: MIT	License not stated
No account needed	Not stated if an account is needed
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.