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Proton Authenticator vs Authme: catalog facts
Proton Authenticator	Authme
Free Free and open source under the GPL, with no advertising. A Proton account is used for…	Free Free and open source under the GPL-3.0 licence.
Windows, Linux, Android, iOS	Windows
End-to-end encrypted sync between devices, which most free authenticators lack Apps for Android, iOS, Windows, Linux and macOS	TOTP code generation on the desktop Imports Google Authenticator QR codes
Sync requires a Proton account Keeping codes on the same desktop you log in from weakens second-factor separation	Keeping 2FA codes on the same computer as passwords reduces separation of factors
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
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.