Color Lab — Free & Private

Convert colors and check contrast, pull palettes from photos, simulate color blindness and generate color scales and gradients.

Runs 100% in your browser: your files and data never leave your device. No signup, no ads.

Tools in Color Lab

Color Harmony Game & Quiz: Interactive color theory quiz and harmony trainer to master complementary, triadic, and analogous color schemes.
Color Converter & Contrast: Convert HEX, RGB, HSL with WCAG 2.2 AA accessibility contrast ratio verification.
Color Palette Extractor: Extract dominant color palettes and CSS variables from any uploaded photo.
Color Blindness Simulator: Preview how an image looks under protanopia, deuteranopia, and tritanopia.
Design System Color Scale Generator: Generate 10-step design-system color scales (50-950) with CSS variables, Tailwind, and contrast ratings
CSS Gradient Studio: Design linear, radial, and conic CSS gradients with multi-stop color controls and copy-ready syntax.
Image Color Picker & Eyedropper: Upload an image and sample colors pixel-by-pixel with an interactive magnifying loupe, palette history, and color format exports.