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Proton Authenticator vs Google Authenticator: catalog facts
Proton Authenticator	Google Authenticator
Free Free and open source under the GPL, with no advertising. A Proton account is used for…	Free Free to download and use.
Windows, Linux, Android, iOS	Android, iOS
End-to-end encrypted sync between devices, which most free authenticators lack Apps for Android, iOS, Windows, Linux and macOS	Generates codes without a network connection Optional sync of codes across devices via a Google Account
Sync requires a Proton account Keeping codes on the same desktop you log in from weakens second-factor separation	Cloud sync ties your codes to a Google Account Not open source
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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