30+ calculators covering finance, health, math, and more. Dark theme, real-time results, mobile-friendly.
Tech stack: Next.js 16, TypeScript, Tailwind v4. All computation is client-side — no backend, no tracking. SSR for SEO, ~350KB total page weight, CLS 0.
Blog posts embed working calculators via MDX, which was fun to build.
No revenue yet, just a side project. Curious what tools you'd find useful.