Roller scrubber
Drag the field or the roller to scrub. Physics-based detents mean a value always lands on a whole step.
Types like a human
10ft, 123", 5' 6", 1 1/2 in, 45cm, 96px. Stored canonically in millimetres, so switching units loses nothing.
Formulas, no eval()
(190*120)/144, 1m+500mm, 100 * length. A real parser with real precedence, live validity and syntax highlighting.
Touch-first
Pointer capture, 44px targets on coarse pointers, and a vertical drag scrubs instead of scrolling the page.
106 CSS variables
Every colour, size, weight and timing is a token. Restyle without fighting a single selector.
Two builds
A plain-CSS build that works anywhere, and a Tailwind build with no stylesheet. Same API.
Built for people who cut material
The audience is designers, carpenters and CAD operators — not programmers. A plausible-but-wrong number is far more dangerous than a visible error, because someone will trust a bad dimension and cut to it. So the formula engine rejects bitwise operators and ^ outright rather than returning a number nobody expects. Powers are pow(2,10), spelled out.
Provided as is, without warranty. Verify your own numbers — this is a UI input, not a certified measurement tool.