FourZero Colour Lab

FourZero's colour toolkit for designers and developers.

FourZero Colour Lab is a practical colour toolkit for designers, developers and digital creators. Capture colours directly from webpages, inspect colour values, create colour palettes and convert colours into formats ready for your design and development workflow. FEATURES • Eyedropper — Pick a colour directly from the current webpage with a live magnifier and colour information. • Colour Converter — Convert between HEX, RGB and HSL, identify HTML/CSS colour names, and find approximate Pantone and RAL Classic matches. • Palette Generator — Create colour harmonies including analogous, monochromatic, complementary, split complementary, triadic, tetradic, square, compound and shade palettes. • Colour History — Keep recently selected colours available for quick reuse. • Favourites — Save frequently used colours locally for easy access. • Developer Exports — Copy colours as CSS variables, SCSS, Tailwind configuration or JSON. • REM ↔ PX Converter — Quickly convert responsive typography values between REM and pixels using your preferred root font size. PRIVACY FourZero Colour Lab is designed to work locally in your browser. Selected colours, favourites and colour history are stored locally using Chrome storage. The extension does not require an account and does not transmit your colour data to FourZero servers. The webpage colour picker is activated by the user and temporarily captures the visible page to determine the colour beneath the cursor. This information is processed locally by the extension and is not uploaded to FourZero. Pantone and RAL matches are approximate RGB-distance matches and should be verified against official physical colour references for production use. FourZero Colour Lab is developed by FourZero.