Cyan4
cyan4 · #008B8B
HEX
#008B8B
RGB
rgb(0, 139, 139)
CMYK
cmyk(100%, 0%, 0%, 45%)
HSL
hsl(180, 100%, 27%)
LAB
lab(52.2, -30.6, -9.0)
What is Cyan4?
Cyan4 is the cyan4 reference in the X11 named colors. Its sRGB value is #008B8B (rgb 0, 139, 139). It sits in the cyan 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 Cyan4 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Cyan4
An 11-step tonal scale derived from Cyan4 (#008B8B). 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
#EBF6F6
#EBF6F6
100
#D6ECEC
#D6ECEC
200
#ADDADA
#ADDADA
300
#80C5C5
#80C5C5
400
#40A8A8
#40A8A8
500
#008B8B
#008B8B
600
#007676
#007676
700
#005A5A
#005A5A
800
#003F3F
#003F3F
900
#002323
#002323
950
#001111
#001111
Lighter tints (mixed with white)
15%
#6CA4A4
30%
#95B8B8
45%
#B3CACA
60%
#CBDADA
75%
#E1E9E9
Darker shades (mixed with black)
15%
#008181
30%
#007676
45%
#006969
60%
#005A5A
75%
#004848
Color harmonies for Cyan4
Classic color-theory harmonies derived from rotating the hue of Cyan4. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#008B8B
#008B8B
#8A0000
#8A0000
Triadic
Three colors 120° apart
#008B8B
#008B8B
#8A008A
#8A008A
#8A8A00
#8A8A00
Analogous
Two neighbors ±30° on the wheel
#008A45
#008A45
#008B8B
#008B8B
#00458A
#00458A
Split-complementary
Base + two colors flanking its complement
#008B8B
#008B8B
#8A0045
#8A0045
#8A4500
#8A4500
Tetradic
Two complementary pairs
#008B8B
#008B8B
#00008A
#00008A
#8A0000
#8A0000
#8A8A00
#8A8A00
Square
Four colors evenly spaced 90° apart
#008B8B
#008B8B
#45008A
#45008A
#8A0000
#8A0000
#458A00
#458A00
Cyan4 in every color space
Full conversion of Cyan4 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
#008B8B
RGB
rgb(0, 139, 139)
CMYK
cmyk(100%, 0%, 0%, 45%)
HSL
hsl(180, 100%, 27%)
HSV
hsv(180, 100%, 55%)
HWB
hwb(180 0% 45%)
CIE Lab
lab(52.2 -30.6 -9.0)
OKLCH
oklch(57.7% 0.098 194.8)
XYZ (D65)
xyz(13.89, 20.33, 27.61)
Copy-ready code for Cyan4
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: #008B8B;
background-color: #008B8B;CSS variable
:root {
--color-cyan4: #008B8B;
}Tailwind config
// tailwind.config.js
colors: {
'cyan4': '#008B8B',
}Sass
$color-cyan4: #008B8B;Swift UIColor
UIColor(red: 0.000, green: 0.545, blue: 0.545, alpha: 1.0)Android XML
<color name="cyan4">#008B8B</color>Closest match in every color system
The nearest Cyan4 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 5018
#3F888F
Turquoise blue
RAL 5024
#5D9B9B
Pastel blue
RAL 5021
#256D7B
Water blue
RAL 6000
#316650
Patina green
RAL 6026
#015D52
Opal green
RAL 7000
#7E8B92
Squirrel grey
FAQ about Cyan4
What is the HEX code for Cyan4?
Cyan4 (cyan4) has the HEX code #008B8B. In RGB it is rgb(0, 139, 139), and in CMYK it is cmyk(100%, 0%, 0%, 45%).
What is the OKLCH value of Cyan4?
Cyan4 converts to oklch(0.577 0.098 194.8). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Cyan4 accessible for body text?
Used as a background, Cyan4 has a contrast ratio of 5.07:1 with black text and 4.15:1 with white text. WCAG 2.1 AA requires 4.5:1 for normal text. The current recommendation is to use black text and verify in real UI context.
What is the closest Pantone to Cyan4?
The closest Pantone reference to Cyan4 by ΔE2000 perceptual distance is Pantone 321 C (#008C95). Cross-system Pantone matching is approximate; for color-critical print work, verify with a physical Pantone guide.
What is the closest RAL color to Cyan4?
The closest RAL Classic reference to Cyan4 by ΔE2000 distance is RAL 5018 (Turquoise blue, #3F888F). RAL is a German industrial coating standard commonly used for paint, powder coat, and architectural specification.
What is the complementary color of Cyan4?
The complementary color (180° opposite on the HSL color wheel) of Cyan4 is #8A0000. 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.