I used Lovable to make a webapp that tells you whether to pay down debt (student loan, credit card debt) or invest in stocks or 401K or REITs. I had an Excel model for this and uploaded this to Lovable and spent some time iterating on the UI.
Do test it out, I'd love to get any feedback.
Show HN: Paydown calculator, Should you pay down debt or invest in the markets?
data-to-display-whiz.lovable.app