OKLCH

OKLCH Color Picker is a free tool from Evil Martians, by Andrey Sitnik and Roman Shamin, for picking and converting colours in the OKLCH space that modern CSS supports. Separate graphs for lightness, chroma, hue and alpha show where a colour sits, toggles reveal P3 and Rec2020 gamuts and a 3D view, and any hex, RGB or HSL value converts on paste. Reach for it when moving a palette from hex or HSL into OKLCH and checking which colours fall outside the sRGB gamut.