Colori is a JavaScript (or PHP) module to manipulate colors: convert between CSS-supported formats (RGB, HSL, LAB, OKLAB, etc.), mix or unmix colors, calculate or improve their contrast, etc.
JavaScript must be enabled to use this demo website.
You can also use functions from colori.js (see documentation) in this input field, by applying them to the typed color value as if it were a JavaScript object. You can even chain them!