andOTP is described as 'It implements Time-based One-time Passwords (TOTP) and HMAC-Based One-Time Passwords (HOTP). Simply scan the QR code and login with the generated 6-digit code' and is a popular Authenticator in the security & privacy category. There are more than 50 alternatives to andOTP for a variety of platforms, including Android, iPhone, iPad, Mac and Android Tablet apps. The best andOTP alternative is Aegis Authenticator, which is both free and Open Source. Other great apps like andOTP are Ente Auth, Authy, 2FA Authenticator (2FAS) and Google Authenticator.
Same basic purpose, but offers more features.