X11 named colors — 308 colors
Historical X Window System color names — the numbered 1-4 lightness variants of the classic xorg-server rgb.txt palette.
X11 named colors are the legacy color keywords from the X Window System's `rgb.txt` file, in continuous use since the 1980s. This page lists 308 numbered variants (e.g. snow1 through snow4, tomato1 through tomato4) that aren't part of the CSS Named Colors specification — providing finer lightness control for designers and developers working with classic Unix or scientific computing palettes.
Every entry links to a full per-color page with HEX, RGB, OKLCH, accessibility ratios, color harmonies, the closest Pantone and RAL matches, and copy-ready CSS, Tailwind, Sass, Swift, and Android snippets. Note: most modern browsers accept these names directly in CSS.
Sourced from X11 named colors (xorg rgb.txt) under the MIT/X11 license (X Consortium) license. Use as a reference for legacy and creative color names. Most modern CSS implementations accept these names directly.
Source: X11 named colors (xorg rgb.txt) · License: MIT/X11 license (X Consortium)
X.Org Foundation / X Consortium — MIT/X11 License
Upstream: https://cgit.freedesktop.org/xorg/app/rgb/tree/rgb.txt
blue (32)
brown (8)
cyan (37)
green (34)
neutral (18)
orange (37)
pink (37)
purple (16)
red (44)
yellow (45)
FAQ — X11 named colors
How many colors are in X11 named colors?
X11 named colors contains 308 distinct colors on PantoneTools, organized by hue family. Each color has its own page with HEX, RGB, OKLCH, accessibility, and cross-system matches.
Is X11 named colors free to use commercially?
Yes. X11 named colors is published under the MIT/X11 license (X Consortium). X.Org Foundation / X Consortium — MIT/X11 License You can use these color values freely in commercial and personal work; refer to the upstream source for any attribution requirements.
What is the closest Pantone equivalent for colors in X11 named colors?
Every color page on this site computes the closest Pantone reference using the CIEDE2000 perceptual color-distance formula. Cross-system Pantone matching is approximate — verify color-critical print work with a physical Pantone guide.
Does X11 named colors include OKLCH values?
Every color page on PantoneTools shows both the original HEX value and its OKLCH equivalent. OKLCH is the perceptually-uniform color space that powers Tailwind v4 and CSS Color Module Level 4.
Where can I download X11 named colors as a file?
The upstream source (X11 named colors (xorg rgb.txt)) is available at https://cgit.freedesktop.org/xorg/app/rgb/tree/rgb.txt. PantoneTools provides per-color pages with copy-ready CSS, Tailwind, Sass, Swift, and Android XML snippets; downloadable bundle exports are on the roadmap.