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Proton Authenticator vs 2FAuth: catalog facts
Proton Authenticator	2FAuth
Free Free and open source under the GPL, with no advertising. A Proton account is used for…	Free Free and open source under the AGPL-3.0 licence.
Windows, Linux, Android, iOS	Web, Self-hosted
End-to-end encrypted sync between devices, which most free authenticators lack Apps for Android, iOS, Windows, Linux and macOS	Codes available from any device with a browser Easy backup and restore of a standalone database
Sync requires a Proton account Keeping codes on the same desktop you log in from weakens second-factor separation	Requires running your own server Fully localised only in English and French
Downloadable app	Self-hosted
Open source	Open source
License: GPL-3.0	License: AGPL-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.