Aegis Authenticator is described as 'Free, secure and open source app to manage your 2-step verification tokens for your online services' and is a very popular Authenticator in the security & privacy category. There are more than 50 alternatives to Aegis Authenticator for a variety of platforms, including iPhone, Android, iPad, Android Tablet and Mac apps. The best Aegis Authenticator alternative is Ente Auth, which is both free and Open Source. Other great apps like Aegis Authenticator are Proton Authenticator, Bitwarden Authenticator, Authy and 2FA Authenticator (2FAS).