Open Color Collections
Reference collections from open-licensed color systems. Each color has HEX, RGB, CMYK, HSL, Lab, accessibility ratios, palette suggestions, and ΔE2000-based matches against Pantone and RAL. See the disclaimer for notes on values and trademarks.
Tailwind CSS palette
The default color palette shipped with Tailwind CSS v3 by Tailwind Labs. 22 color families across 11 lightness steps (50 to 950).
242 colors · ΔE2000 cross-system matching · Browse Tailwind CSS palette
CSS Named Colors
The 147 named colors defined by the W3C CSS Color Module Level 4 specification — usable directly in CSS as keywords like 'crimson' or 'rebeccapurple'.
141 colors · ΔE2000 cross-system matching · Browse CSS Named Colors
Open Color
Open Color, an open-source color palette by Heeyeun designed for UI work. 13 hues across 10 shades (0 to 9) tuned for screen legibility and accessibility.
130 colors · ΔE2000 cross-system matching · Browse Open Color
X11 named colors
Historical X Window System color names — the numbered 1-4 lightness variants of the classic xorg-server rgb.txt palette.
308 colors · ΔE2000 cross-system matching · Browse X11 named colors