I Built 31 Free Financial Calculators with Embeddable Widgets — Here's How

I recently built FinCruncher — a collection of 31 free financial calculators. No accounts, no tracking, no ads. Just calculators. I wanted to share the technical approach, especially the embeddable widget system that lets anyone add these calculators to their own site with a single line of HTML. The Stack Next.js with static export ( output: 'export' ) Tailwind CSS for styling jsPDF for client-side PDF generation Cloudflare Workers for IP-based geolocation Hosted on a Linode VPS behind Cloudflare CDN Everything runs client-side. Your financial data never leaves your browser. The Calculators 31 calculators covering mortgage, compound interest, credit card payoff, retirement savings, debt payoff, ROI, income tax, car insurance, and more. Three of them (mortgage, income tax, car insurance) have state-specific versions for all 50 US states + DC — that's 153 additional pages with localized data. Each calculator includes: Interactive visualizations (charts, amortization tables) PDF download