Cyan1
cyan1 · #00FFFF
HEX
#00FFFF
RGB
rgb(0, 255, 255)
CMYK
cmyk(100%, 0%, 0%, 0%)
HSL
hsl(180, 100%, 50%)
LAB
lab(91.1, -48.1, -14.1)
What is Cyan1?
Cyan1 is the cyan1 reference in the X11 named colors. Its sRGB value is #00FFFF (rgb 0, 255, 255). 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 Cyan1 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Cyan1
An 11-step tonal scale derived from Cyan1 (#00FFFF). 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
#EBFFFF
#EBFFFF
100
#D6FFFF
#D6FFFF
200
#ADFFFF
#ADFFFF
300
#80FFFF
#80FFFF
400
#40FFFF
#40FFFF
500
#00FFFF
#00FFFF
600
#00D9D9
#00D9D9
700
#00A6A6
#00A6A6
800
#007373
#007373
900
#004040
#004040
950
#001F1F
#001F1F
Lighter tints (mixed with white)
15%
#6CFFFF
30%
#95FFFF
45%
#B3FFFF
60%
#CBFFFF
75%
#E1FFFF
Darker shades (mixed with black)
15%
#00EDED
30%
#00DADA
45%
#00C4C4
60%
#00AAAA
75%
#008989
Color harmonies for Cyan1
Classic color-theory harmonies derived from rotating the hue of Cyan1. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#00FFFF
#00FFFF
#FF0000
#FF0000
Triadic
Three colors 120° apart
#00FFFF
#00FFFF
#FF00FF
#FF00FF
#FFFF00
#FFFF00
Analogous
Two neighbors ±30° on the wheel
#00FF80
#00FF80
#00FFFF
#00FFFF
#007FFF
#007FFF
Split-complementary
Base + two colors flanking its complement
#00FFFF
#00FFFF
#FF0080
#FF0080
#FF8000
#FF8000
Tetradic
Two complementary pairs
#00FFFF
#00FFFF
#0000FF
#0000FF
#FF0000
#FF0000
#FFFF00
#FFFF00
Square
Four colors evenly spaced 90° apart
#00FFFF
#00FFFF
#7F00FF
#7F00FF
#FF0000
#FF0000
#80FF00
#80FF00
Cyan1 in every color space
Full conversion of Cyan1 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
#00FFFF
RGB
rgb(0, 255, 255)
CMYK
cmyk(100%, 0%, 0%, 0%)
HSL
hsl(180, 100%, 50%)
HSV
hsv(180, 100%, 100%)
HWB
hwb(180 0% 0%)
CIE Lab
lab(91.1 -48.1 -14.1)
OKLCH
oklch(90.5% 0.155 194.8)
XYZ (D65)
xyz(53.80, 78.73, 106.95)
Copy-ready code for Cyan1
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: #00FFFF;
background-color: #00FFFF;CSS variable
:root {
--color-cyan1: #00FFFF;
}Tailwind config
// tailwind.config.js
colors: {
'cyan1': '#00FFFF',
}Sass
$color-cyan1: #00FFFF;Swift UIColor
UIColor(red: 0.000, green: 1.000, blue: 1.000, alpha: 1.0)Android XML
<color name="cyan1">#00FFFF</color>Closest match in every color system
The nearest Cyan1 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 6027
#84C3BE
Light green
RAL 6019
#BDECB6
Pastel green
RAL 9002
#E7EBDA
Grey white
RAL 9003
#F4F4F4
Signal white
RAL 7035
#D7D7D7
Light grey
RAL 9018
#D7D7D7
Papyrus white
FAQ about Cyan1
What is the HEX code for Cyan1?
Cyan1 (cyan1) has the HEX code #00FFFF. In RGB it is rgb(0, 255, 255), and in CMYK it is cmyk(100%, 0%, 0%, 0%).
What is the OKLCH value of Cyan1?
Cyan1 converts to oklch(0.905 0.155 194.8). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Cyan1 accessible for body text?
Used as a background, Cyan1 has a contrast ratio of 16.75:1 with black text and 1.25:1 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 Cyan1?
The closest Pantone reference to Cyan1 by ΔE2000 perceptual distance is Pantone 304 C (#9CDBD9). Cross-system Pantone matching is approximate; for color-critical print work, verify with a physical Pantone guide.
What is the closest RAL color to Cyan1?
The closest RAL Classic reference to Cyan1 by ΔE2000 distance is RAL 6027 (Light green, #84C3BE). RAL is a German industrial coating standard commonly used for paint, powder coat, and architectural specification.
What is the complementary color of Cyan1?
The complementary color (180° opposite on the HSL color wheel) of Cyan1 is #FF0000. 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.