Weird web tools that do one job well.
A curated list — every tool here was tried by a real human before being posted. Sites with obtrusive ads, or without at least a free demo, get rejected.
- ✓ Curated by hand, not scraped
- ✓ Tried by a real human first
- ✓ No obtrusive ads
- ✓ Free demo at minimum
2 tools matching “calculator”
Plan a campervan or RV electrical system: battery capacity, solar panel sizing, and safe wire gauges, calculated in the browser. Works offline as a PWA. Free, no ads.
A graphing calculator that makes equations feel tactile: type a function, drag the sliders, watch the curves move. Free, fast, and the standard in classrooms for good reason.