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Proton Authenticator vs KeeTrayTOTP: catalog facts
Proton Authenticator	KeeTrayTOTP
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 licence.
Windows, Linux, Android, iOS	Windows
End-to-end encrypted sync between devices, which most free authenticators lack Apps for Android, iOS, Windows, Linux and macOS	Generates TOTP codes inside KeePass 2 Supports Steam's code format as well as standard RFC 6238 codes
Sync requires a Proton account Keeping codes on the same desktop you log in from weakens second-factor separation	Requires KeePass 2; it is not a standalone app Keeping 2FA secrets with passwords weakens the separation of factors
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	No account 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.