ExpeditedSSL vs Let's Encrypt: What are the differences?

Developers describe ExpeditedSSL 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 Stop pouring through MAN pages and outdated blog posts that don't take into account new requirements.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. On the other hand, Let's Encrypt is detailed as "A free, automated, and open Certificate Authority (CA)". Let’s Encrypt is a free, automated, and open certificate authority brought to you by the non-profit Internet Security Research Group (ISRG).

ExpeditedSSL and Let's Encrypt can be categorized as "Security" tools.

"It saved my ass" is the primary reason why developers consider ExpeditedSSL over the competitors, whereas "Open Source SSL" was stated as the key factor in picking Let's Encrypt.