From one HTML file to first sale. PRO integration, postMessage, localStorage, Gumroad API — all the gotchas.
I built 24 browser-based tools. Here is the complete technical guide for building your own and selling PRO licenses on Gumroad.
Architecture: One HTML File + GitHub Pages + Gumroad
No frameworks, no backend, no monthly costs. One HTML file on GitHub Pages. Gumroad handles payments.
The PRO Flow
User hits free limit → PRO modal
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