Comparison with other libraries?

[richardonrails]

Just curious if there are any substantial differences between these libraries? You mention the first one but wasn't sure about the latter two.
https://github.com/wmlele/devise-otp
https://github.com/tinfoil/devise-two-factor
https://github.com/Houdini/two_factor_authentication

Two of these are mentioned on https://github.com/plataformatec/devise/wiki/Extensions

[williamatodd]

@richardonrails the original problem I faced was an absence of a 2FA extension that could work with both ActiveRecord and Mongoid. I already had SymmetricEncryption on board two applications to meet other requirements and it was somewhat trivial to extend this hodgepodge. Other extensions weren't storing the otp secrets and recovery codes in an encrypted form and that didn't pass the smell test.