Difference between SFIN and Fiori for SFIN

Dear experts,

When I filtered Fiori apps for Simple Finance Add-on, I got 141 apps.

Just wondering the difference between Simple Finance and Fiori for Simple Finance.

As far as I know, both of their front-end technology is SAPUI5(Fiori style), so may I know any difference between them?Business logic or anything else?

Thanks a lot in advance!

Chloe Yan