Apps similar to Duo mobile include Aegis Authenticator, which is free and open source. Other options are Proton Authenticator, 2FA Authenticator (2FAS), Authy and Stratum. Authenticators like Duo mobile are a crowded field, with more than 50 alternatives for iPhone, Android, iPad, Mac and Linux.
Token2 mobile application can be used with Token2 service, or any other TOTP and Mobile-OTP compliant service with additional features such as possibility of PIN code protection for TOTP profiles and QR code based enrollment for Mobile-OTP profiles.
Switzerland
Unlimited two-factor codes for free, plus tap-to-approve push sign-ins and built-in passkeys — with end-to-end encrypted backup when you switch phones.
Australia
Rublon protects workforce access to networks, servers and applications via easy-to-use multi-factor authentication. Enable MFA for cloud apps, VPNs, servers, workstations, internal as well as on-premise apps. Comply with data protection regulations.
Poland
EU
Coffer is a self-hosted, multi-user authenticator vault. It generates TOTP codes in the browser and encrypts each user's vault before storing it on the server. It also supports QR imports, groups, backups, and 2fas transfers.
Türkiye
