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Proton Authenticator vs Zoho OneAuth: catalog facts
Proton Authenticator	Zoho OneAuth
Free Free and open source under the GPL, with no advertising. A Proton account is used for…	Free Free authenticator app.
Windows, Linux, Android, iOS	Windows, Android, iOS
End-to-end encrypted sync between devices, which most free authenticators lack Apps for Android, iOS, Windows, Linux and macOS	Time-based one-time codes for third-party accounts Passwordless and QR code sign-in for Zoho accounts
Sync requires a Proton account Keeping codes on the same desktop you log in from weakens second-factor separation	Many features apply only to Zoho accounts Closed 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	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.