Proton Authenticator is described as 'Protect your accounts with Proton Authenticator, a private and secure cross-device two-factor authentication (2FA) that works offline. Created by Proton, the creators of Proton Mail, Proton VPN, Proton Drive, and Proton Pass' and is a popular Authenticator in the security & privacy category. There are more than 50 alternatives to Proton Authenticator for a variety of platforms, including Android, iPhone, iPad, Android Tablet and Windows apps. The best Proton Authenticator alternative is Bitwarden, which is both free and Open Source. Other great apps like Proton Authenticator are KeePassXC, KeePass, Aegis Authenticator and Ente Auth.
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