I have read about this a little from the user POV, but I have not yet used Authy to build a service which provides 2FA, so I do not understand the details enoug

I have read about this a little from the user POV, but I have not yet used Authy to build a service which provides 2FA, so I do not understand the details enough to really talk intelligently about the differences. I do recall reading that Authy uses SHA256 and 7 digit codes instead of SHA1 and 6 digit codes like Google Authenticator (cannot find source). However, the Key URI Format documentation in the Google Authenticator project [1] does have optional support for SHA256 and configurable number of digits, so Google Authenticator could support that too if it wanted to. [1] https://github.com/google/google-authenticator/wiki/Key-Uri-Format https://github.com/google/google-authenticator/wiki/Key-Uri-...