Duo Security vs ExpeditedSSL: 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, ExpeditedSSL is detailed as "The Fastest, easiest way to add SSL to your Heroku + AWS Apps". Stop pouring through MAN pages and outdated blog posts that don't take into account new requirements. With our add-on, you can go from install to confirmed installation in as little as twenty minutes: using nothing but your browser.

Duo Security and ExpeditedSSL belong to "Security" category of the tech stack.