Red3
red3 · #CD0000
HEX
#CD0000
RGB
rgb(205, 0, 0)
CMYK
cmyk(0%, 100%, 100%, 20%)
HSL
hsl(0, 100%, 40%)
LAB
lab(42.7, 67.9, 57.0)
What is Red3?
Red3 is the red3 reference in the X11 named colors. Its sRGB value is #CD0000 (rgb 205, 0, 0). It sits in the red family. Historical X Window System color names — the numbered 1-4 lightness variants of the classic xorg-server rgb.txt palette. See disclaimer for accuracy and trademark notes.
Accessibility
WCAG 2.1 contrast checks for Red3 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Red3
An 11-step tonal scale derived from Red3 (#CD0000). Click any swatch to copy its HEX. Use these as a starting point for design tokens, hover states, and disabled states in a design system.
50
#FBEBEB
#FBEBEB
100
#F7D6D6
#F7D6D6
200
#EFADAD
#EFADAD
300
#E68080
#E68080
400
#DA4040
#DA4040
500
#CD0000
#CD0000
600
#AE0000
#AE0000
700
#850000
#850000
800
#5C0000
#5C0000
900
#330000
#330000
950
#190000
#190000
Lighter tints (mixed with white)
15%
#D66C6C
30%
#DE9595
45%
#E5B3B3
60%
#EDCBCB
75%
#F4E1E1
Darker shades (mixed with black)
15%
#BF0000
30%
#AF0000
45%
#9D0000
60%
#870000
75%
#6D0000
Color harmonies for Red3
Classic color-theory harmonies derived from rotating the hue of Red3. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#CD0000
#CD0000
#00CCCC
#00CCCC
Triadic
Three colors 120° apart
#CD0000
#CD0000
#00CC00
#00CC00
#0000CC
#0000CC
Analogous
Two neighbors ±30° on the wheel
#CC0066
#CC0066
#CD0000
#CD0000
#CC6600
#CC6600
Split-complementary
Base + two colors flanking its complement
#CD0000
#CD0000
#00CC66
#00CC66
#0066CC
#0066CC
Tetradic
Two complementary pairs
#CD0000
#CD0000
#CCCC00
#CCCC00
#00CCCC
#00CCCC
#0000CC
#0000CC
Square
Four colors evenly spaced 90° apart
#CD0000
#CD0000
#66CC00
#66CC00
#00CCCC
#00CCCC
#6600CC
#6600CC
Red3 in every color space
Full conversion of Red3 across the color spaces designers and developers actually use — including OKLCH (the perceptually-uniform space that powers Tailwind v4 and CSS Color Module Level 4) and HWB.
HEX
#CD0000
RGB
rgb(205, 0, 0)
CMYK
cmyk(0%, 100%, 100%, 20%)
HSL
hsl(0, 100%, 40%)
HSV
hsv(0, 100%, 80%)
HWB
hwb(0 0% 20%)
CIE Lab
lab(42.7 67.9 57.0)
OKLCH
oklch(53.3% 0.219 29.2)
XYZ (D65)
xyz(25.18, 12.98, 1.18)
Copy-ready code for Red3
Drop-in snippets for CSS, Tailwind, Sass, iOS Swift, and Android XML. Click the copy button on any snippet to put it on your clipboard.
CSS
color: #CD0000;
background-color: #CD0000;CSS variable
:root {
--color-red3: #CD0000;
}Tailwind config
// tailwind.config.js
colors: {
'red3': '#CD0000',
}Sass
$color-red3: #CD0000;Swift UIColor
UIColor(red: 0.804, green: 0.000, blue: 0.000, alpha: 1.0)Android XML
<color name="red3">#CD0000</color>Closest match in every color system
The nearest Red3 equivalent in every other color system on this site, ranked by ΔE2000 perceptual distance. Useful when translating between design-system, web-standard, and industrial color references.
Closest in X11 named colors
Top 6 ΔE2000-closest entries within the same collection.
Closest Pantone matches
Top 6 ΔE2000-closest Pantone references. Cross-system matching is approximate — see disclaimer.
Closest RAL Classic matches
Top 6 ΔE2000-closest RAL Classic references for industrial coating cross-reference.
RAL 3020
#CC0605
Traffic red
RAL 2002
#CB2821
Vermilion
RAL 2001
#C93C20
Red orange
RAL 3000
#AF2B1E
Flame red
RAL 3016
#B32821
Coral red
RAL 3018
#D53032
Strawberry red
FAQ about Red3
What is the HEX code for Red3?
Red3 (red3) has the HEX code #CD0000. In RGB it is rgb(205, 0, 0), and in CMYK it is cmyk(0%, 100%, 100%, 20%).
What is the OKLCH value of Red3?
Red3 converts to oklch(0.533 0.219 29.2). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Red3 accessible for body text?
Used as a background, Red3 has a contrast ratio of 3.60:1 with black text and 5.84:1 with white text. WCAG 2.1 AA requires 4.5:1 for normal text. The current recommendation is to use white text and verify in real UI context.
What is the closest Pantone to Red3?
The closest Pantone reference to Red3 by ΔE2000 perceptual distance is Pantone 485 C (#DA291C). Cross-system Pantone matching is approximate; for color-critical print work, verify with a physical Pantone guide.
What is the closest RAL color to Red3?
The closest RAL Classic reference to Red3 by ΔE2000 distance is RAL 3020 (Traffic red, #CC0605). RAL is a German industrial coating standard commonly used for paint, powder coat, and architectural specification.
What is the complementary color of Red3?
The complementary color (180° opposite on the HSL color wheel) of Red3 is #00CCCC. Use it for high-contrast accents, error states, or call-to-action pairings.
Data provenance & source
X11 named colors (xorg rgb.txt)
The historical X11 color name list shipped in the xorg-server rgb.txt file. Roughly 550 entries covering classic computing color names like 'PapayaWhip', 'MediumAquamarine', and 'DarkSlateGray'. Many CSS named colors originate here. Use as a reference for legacy and creative color names. Most modern CSS implementations accept these names directly.
- Source type
- derived
- Confidence
- high
- License
- MIT/X11 license (X Consortium)
- Last reviewed
- 2026-05-24
Workflow tags
X11 colors are sRGB digital values from a 1980s color system. For print, convert to a process-appropriate color and proof against substrate.