I built a tool that allows users to share their credit card referral links with others. Typically, users are rewarded with bonus points or miles for every new card holder that they refer. Sometimes, users can offer new applicants a better deal than what is offered publicly by the credit card company.
The app is a basic database that stores users reviews and links, and then sorts them. The most challenging aspect to building this on Bubble was configuring the filters on the homepage.
Link: http://www.cardcaddy.co