This would have been super useful in my 20s, would have been great to save a couple years of anguish. The high interest cards really get you and it's hard to get out of the trap. If you're not doing all the math on which card to pay first, it's really easy to fall behind!
I saw you're using plaid for the bank data, how are you accessing the CC info (interest rates, fees) or do you have a database of the most popular ones? What's next on the roadmap, where do you see it expanding to?