HexaCalc

HexaCalc is a free color toolkit that lives in your browser. Start with any color in hex, rgb(), hsl(), oklch() or a CSS name and you get every other format, the closest named color and a contrast score for white and black text. From there, the palette generator lets you lock the colors you like and shuffle the rest, the color wheel shows complementary, triadic and analogous schemes, and the image picker pulls colors from a photo, your camera or anything on your screen. There are also gradient and shade generators, a WCAG contrast checker, a color blind test and simulator, and converters for hex, RGB, HSL and CMYK. No account, no install.