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Authme vs Proton Authenticator: catalog facts
Authme	Proton Authenticator
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL, with no advertising. A Proton account is used for…
Windows	Windows, Linux, Android, iOS
TOTP code generation on the desktop Imports Google Authenticator QR codes	End-to-end encrypted sync between devices, which most free authenticators lack Apps for Android, iOS, Windows, Linux and macOS
Keeping 2FA codes on the same computer as passwords reduces separation of factors	Sync requires a Proton account Keeping codes on the same desktop you log in from weakens second-factor separation
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 21, 2026

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