Click anywhere on the image to sample. Use the magnifier for pixel-accurate work, then copy any swatch.

One colour in, every notation out - HEX, RGB, HSL and CMYK - with WCAG contrast ratios and shades.

Generative particle flow fields that stream around the cursor like a living system.

Symmetrical mandala patterns from your own seed, drawn live on canvas.

Wider QR options: custom colours, logo-ready export, batch from a list.

Work out the real file size of an audio file at any bitrate, sample rate or channel count.

Continuous-compounding interest and the e-folding half-life that goes with it.

Drag out a grid definition and get the CSS with media queries attached.

See how much mobile data streaming, gaming and video actually costs you per month.