Real Price: See what things really cost, before you pay

I made Real Price to help with something small but genuinely annoying: nobody remembers all 50 states' sales tax rates. You see a price, but you don't actually know what you're paying until checkout. Real Price tells you the real total upfront — tax, tip, and any extra fees — before you even get to the register. Just pick your state and it's already filled in. It also helps you save money: a "Worth It?" calculator shows what small recurring costs (a subscription, a daily coffee) really add up to per year — and what that money could grow into if invested instead. Plus an optional expense tracker that flags subscriptions you might've forgotten about. This is my first shipped project — no login, no ads, everything stays on your device. Built off real feedback from an earlier Reddit post. Would love to know what's actually useful here and what's not.