The service's signature feature (aside from real financial functionality on a mobile app) is up-front and clear disclosure regarding how much a purchase will end up costing you. Affirm gives you a flat percentage interest rate ranging from 10 to 30 percent depending on what you're buying. Lines of credit are extended for each individual purchase, tied to a one-time-use credit card number and three-digit pin that disappear after, and the repayment is dealt with in the app.
Essentially, Affirm is betting that customers will feel better paying off each purchase instead of hacking away at a collective balance. The company aims to be a more honest lender instead of setting up credit lines for customers who cannot afford them. Affirm evaluates each loan based on user credit and perceived ability to pay it back. To apply, users need to provide proof of identity and the apps can be downloaded for iOS here and Android here.