I built free loan payoff calculators to help people save on interest

I recently shipped a side project: PayoffCalculators.org — a set of free online loan payoff calculators. Why I built this Most mortgage calculators only show you the monthly payment. They don't answer the real question: how much can I save by paying extra? I wanted a simple tool where you plug in your loan details, add an extra monthly payment, and instantly see: How many months you cut off your loan How much interest you save A full amortization schedule What's included Mortgage Payoff Calculator Auto Loan Payoff Calculator Loan Payoff Calculator RV Loan Calculator Motorcycle Loan Calculator Construction Loan Calculator Tech stack Next.js + Tailwind CSS, deployed on Cloudflare Workers. The calculation formulas are open source: loan-payoff-formulas . No signup, no ads, no tracking. Just math. Would love any feedback!