Authenticator: 2FA & Password is the best and free app for two-factor authentication (2FA) and password management, trusted by millions of people globally. Easy, safe, and fast! 2FA authentication is recommended by security experts as the most efficient way to add an extra layer of protection for your personal and work accounts by verifying one-time passwords (OTP), which are 6-digit codes for 2-step verification (2SV). 2FA codes generated by Authenticator: 2FA & Password are widely supported