percentagecalculator.net gets millions of visitors a month on a site that hasn't changed since 2007. I wanted to see if a well-built static site could chip away at that traffic. Here's what I built and what I learned about competing with high-DA incumbents using pure on-page SEO.
The tool: https://easypercentage.org — 8 calculators, pure JS, zero backend, Cloudflare Pages.
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