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Proton Authenticator vs andcli: catalog facts
Proton Authenticator	andcli
Free Free and open source under the GPL, with no advertising. A Proton account is used for…	Free Free and open source under the MIT licence.
Windows, Linux, Android, iOS	Windows, Command line
End-to-end encrypted sync between devices, which most free authenticators lack Apps for Android, iOS, Windows, Linux and macOS	Shows 2FA codes directly in the terminal Actively maintained
Sync requires a Proton account Keeping codes on the same desktop you log in from weakens second-factor separation	Terminal only, with no graphical interface Small project with limited documentation
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT
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 September 21, 2026	Official website Full listing and sources Checked October 2, 2026

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