Chronos Authenticator is described as 'Chronos is an open-source two-factor authentication (2FA) app designed to deliver robust security and reliable backup features. It supports both time-based (TOTP) and counter-based (HOTP) authentication methods' and is a Authenticator in the security & privacy category. There are more than 25 alternatives to Chronos Authenticator for a variety of platforms, including Android, iPhone, iPad, Android Tablet and Mac apps. The best Chronos Authenticator alternative is Aegis Authenticator, which is both free and Open Source. Other great apps like Chronos Authenticator are Proton Authenticator, Ente Auth, Bitwarden Authenticator and 2FA Authenticator (2FAS).