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.
Duo Mobile works with Duo Security's two-factor authentication service to make logins more secure. The application generates passcodes for login and can receive push notifications for easy, one-tap authentication.
Duo mobile is the most popular commercial alternative to Proton Authenticator.
FreeOTP+ is a fork of FreeOTP with an updated user interface and with backup/restore functionality (to external files or via built-in Android backup/restore).
2FAuth is a web based self-hosted alternative to One Time Passcode (OTP) generators like Google Authenticator, designed for both mobile and desktop.
2fast (acronym for two factor authenticator supporting TOTP) is the first free, open source, two factor authenticator for Windows and Android with the ability to store the sensitive data encrypted at a place of your choice instead of a 3rd party cloud location.
Secure your Zoho Account with easy-to-use, multi-factor authentication. Because hackers won't give you a second chance.
LastPass Authenticator offers a unique one-tap password verification experience that no other authenticator app delivers.
GTK+ application for securely managing TOTP & HOTP tokens. Content is encrypted on disk using AES256-GCM. Master password derived using PBKDF2 with 100k iterations & SHA512 as hash algorithm. Can import encrypted backups from andOTP & Authenticator+.
Daito is a web-based 2FA authenticator for TOTP tokens. It enables you to share 2FA tokens with others to simply protecting shared accounts. No phone needed.
Two-factor authentication app for Yandex accounts and also other QR-code based temporary codes for two-factor authentication
Etopa is a two-factor-authentication app, which runs as a web server and can be accessed using a web browser or using an Android app. You can use the Etopa.de instance or host your own.
Sentinel is an elegant OTP Authenticator app for both iOS and MacOS. It relies only on the Apple's iCloud Keychain to share data across devices.
The app for calculating one-time-passwords on iPhone and iPad. OTP Auth can be used with any service that uses one time passwords. This includes services like Dropbox and GMail with two-step-verfification enabled. OTP Auth is QR code enabled.
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