I built four boring finance calculators - here is what the numbers say

<h1> I built four boring finance calculators 鈥?and the numbers explain why tool sites make money </h1> <p>Most "make money online" advice points at SaaS. But a lot of quiet revenue on the web comes from single-purpose calculators with no login, no signup, and no backend.</p> <p>I built four to test the idea:</p> <ul> <li>mortgage calculator (principal, interest, taxes, insurance, PMI, extra paymen

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