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Bitwarden Authenticator vs Proton Authenticator: catalog facts
Bitwarden Authenticator	Proton Authenticator
Free Free to download and use.	Free Free and open source under the GPL, with no advertising. A Proton account is used for…
Android, iOS	Windows, Linux, Android, iOS
Standalone app, separate from the password vault Free to use	End-to-end encrypted sync between devices, which most free authenticators lack Apps for Android, iOS, Windows, Linux and macOS
Mobile only Few details published about import, export or backup on the product page	Sync requires a Proton account Keeping codes on the same desktop you log in from weakens second-factor separation
Downloadable app	Downloadable app
Closed source	Open source
License not stated	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 September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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