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Proton Authenticator vs Authenticator: catalog facts
Proton Authenticator	Authenticator
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 or later.
Windows, Linux, Android, iOS	Linux
End-to-end encrypted sync between devices, which most free authenticators lack Apps for Android, iOS, Windows, Linux and macOS	Supports both TOTP and HOTP codes Fits in with the GNOME desktop
Sync requires a Proton account Keeping codes on the same desktop you log in from weakens second-factor separation	Built for Linux desktops only Codes live on the desktop rather than on a phone you carry
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-or-later
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 September 24, 2026

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