Proton has launched a new open-source Authenticator app designed to boost privacy while enabling easy two-factor authentication across services.
The Proton Authenticator supports both TOTP and secure push-based authentication. Unlike many competitors, it stores secrets locally and uses end-to-end encryption.
According to Proton, the app is available on iOS and Android, and integrates with Proton Pass to simplify account protection using secure keys.
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In a statement, Proton emphasized that no data is stored on its servers and the app’s source code is fully auditable via GitHub.
“Users shouldn’t have to trade convenience for security,” Proton stated, noting the app’s design prioritizes transparency, privacy, and cross-device backup.
Additionally, Proton Authenticator allows encrypted cloud backup of accounts, letting users restore credentials across devices without risking sensitive token leaks.
The app also includes automatic screenshot blocking and a secure onboarding process to limit exposure during setup and token retrieval phases.
Push authentication is available for Proton accounts, allowing users to approve logins with a single tap, reducing reliance on insecure SMS codes.
Proton CEO Andy Yen said the move aligns with Proton’s mission to offer private, secure tools that remain independent of big tech ecosystems.
By releasing the app under an open-source license, Proton aims to set a new baseline for what users should expect in privacy-first tools.
