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Proton Authenticator vs Pocket2FA: catalog facts
Proton Authenticator	Pocket2FA
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	Android
End-to-end encrypted sync between devices, which most free authenticators lack Apps for Android, iOS, Windows, Linux and macOS	Generates TOTP and Steam codes locally Works offline after syncing
Sync requires a Proton account Keeping codes on the same desktop you log in from weakens second-factor separation	Needs a 2FAuth server to sync with Small project with no GitHub releases
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: AGPL-3.0
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 October 2, 2026

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