TOTP is more widespread and reliable – this is an algorithm in which time is used as one of the parameters for one-time passwords generation.
Google Authenticator app supports both Time-based One-Time Password (TOTP) and HMAC-based one-time password (HOTP) OTP generation algorithms, which allows using it with more resources. Besides, it should be noted that the software works on almost all versions of Android and takes no more than 2 MB, which is significant for owners of phones with a small amount of RAM. Google Authenticator has decisive, easy to use, clear UI (user interface) that even a child would find informative. It’s free, handy, and offered on many websites by default.
Google two-factor authentication app is probably the most popular and best known among 2FA evangelists. Test free 2FA authenticator with cloud backup Protectimus SMART OTP
