Duo Security vs Tinfoil Security: What are the differences?

Developers describe Duo Security as "Verifies the identity of your users with two-factor authentication". In order to trust that your users are who they say they are, we verify their identity with an easy-to-use two-factor authentication solution, while giving you the ability to enforce stronger user access policies. On the other hand, Tinfoil Security is detailed as "Routine scans of your website’s security health and vulnerabilities". Our automated scan checks for vulnerabilities in every nook and cranny of your website. Using the same techniques as malicious hackers, we systematically test all the access points, giving you step-by-step instructions on how to eliminate any threat.

Duo Security and Tinfoil Security can be primarily classified as "Security" tools.