OTP Auth is described as 'Generates time- and counter-based one-time passwords, supports QR code imports, includes Notification Center widget, ad-free, and enables encrypted iCloud sync' and is a Authenticator in the security & privacy category. There are more than 50 alternatives to OTP Auth for a variety of platforms, including iPhone, Android, iPad, Android Tablet and Mac apps. The best OTP Auth alternative is Aegis Authenticator, which is both free and Open Source. Other great apps like OTP Auth are Proton Authenticator, Ente Auth, Bitwarden Authenticator and 2FA Authenticator (2FAS).