I've been building Practical Web Tools over the past year – a collection of free calculators and utilities that run entirely in your browser with no signups, no accounts, and no data sent to servers.
The idea came from frustration with the state of online tools. Most calculator sites are SEO farms with one useful tool buried under ads, or they want your email before you can do basic math. I wanted something I'd actually use myself.
Everything runs client-side in JavaScript. No backend processing, no tracking, no reason to collect your data in the first place.
Categories include financial calculators, math tools, unit converters, health/fitness, sports betting odds, and a bunch of niche stuff I added because someone asked.
Tech stack is intentionally boring: static HTML/JS, hosted on Cloudflare Pages. Monetization is just ads, kept minimal enough that I'd tolerate them myself.
Would appreciate any feedback. Particularly interested in:
Tools you'd want that don't exist or are paywalled elsewhere
cobrapi•1h ago
The idea came from frustration with the state of online tools. Most calculator sites are SEO farms with one useful tool buried under ads, or they want your email before you can do basic math. I wanted something I'd actually use myself.
Everything runs client-side in JavaScript. No backend processing, no tracking, no reason to collect your data in the first place.
Categories include financial calculators, math tools, unit converters, health/fitness, sports betting odds, and a bunch of niche stuff I added because someone asked.
Tech stack is intentionally boring: static HTML/JS, hosted on Cloudflare Pages. Monetization is just ads, kept minimal enough that I'd tolerate them myself.
Would appreciate any feedback. Particularly interested in:
Tools you'd want that don't exist or are paywalled elsewhere
Performance issues (some calculators got complex) Anything broken