Freelancer builds business tools as single HTML files, no backend needed

A developer created a suite of freelance business tools—rate calculator, proposal generator, contract generator, and invoice tracker—each as a single HTML file. The tools use localStorage for state, client-side JS, and window.print() for PDF export, requiring no build step, server, or signup. The approach prioritizes privacy, zero maintenance, and longevity, though it lacks sync and collaboration features.