OTPClient is described as 'GTK+ application for securely managing TOTP & HOTP tokens. Content is encrypted on disk using AES256-GCM. Master password derived using PBKDF2 with 100k iterations & SHA512 as hash algorithm. Can import encrypted backups from andOTP & Authenticator+' and is a Authenticator in the security & privacy category. There are more than 25 alternatives to OTPClient for a variety of platforms, including Android, iPhone, Linux, Android Tablet and iPad apps. The best OTPClient alternative is Aegis Authenticator, which is both free and Open Source. Other great apps like OTPClient are Proton Authenticator, Bitwarden Authenticator, 2FA Authenticator (2FAS) and Authy.