Cyan 3
cyan-3 · #66D9E8
HEX
#66D9E8
RGB
rgb(102, 217, 232)
CMYK
cmyk(56%, 6%, 0%, 9%)
HSL
hsl(187, 74%, 65%)
LAB
lab(80.9, -28.4, -17.3)
What is Cyan 3?
Cyan 3 is the cyan-3 reference in the Open Color. Its sRGB value is #66D9E8 (rgb 102, 217, 232). It sits in the cyan family. 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. See disclaimer for accuracy and trademark notes.
Accessibility
WCAG 2.1 contrast checks for Cyan 3 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Cyan 3
An 11-step tonal scale derived from Cyan 3 (#66D9E8). 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
#F3FCFD
#F3FCFD
100
#E7F9FB
#E7F9FB
200
#CEF3F8
#CEF3F8
300
#B3ECF4
#B3ECF4
400
#8CE3EE
#8CE3EE
500
#66D9E8
#66D9E8
600
#57B8C5
#57B8C5
700
#428D97
#428D97
800
#2E6268
#2E6268
900
#1A363A
#1A363A
950
#0C1A1C
#0C1A1C
Lighter tints (mixed with white)
15%
#8CDFEC
30%
#A8E5EF
45%
#BFEBF3
60%
#D3F1F6
75%
#E5F6FA
Darker shades (mixed with black)
15%
#5ECAD8
30%
#56B9C6
45%
#4CA6B2
60%
#41909A
75%
#33747C
Color harmonies for Cyan 3
Classic color-theory harmonies derived from rotating the hue of Cyan 3. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#66D9E8
#66D9E8
#E87364
#E87364
Triadic
Three colors 120° apart
#66D9E8
#66D9E8
#E864D8
#E864D8
#D8E864
#D8E864
Analogous
Two neighbors ±30° on the wheel
#64E8B5
#64E8B5
#66D9E8
#66D9E8
#6496E8
#6496E8
Split-complementary
Base + two colors flanking its complement
#66D9E8
#66D9E8
#E86496
#E86496
#E8B564
#E8B564
Tetradic
Two complementary pairs
#66D9E8
#66D9E8
#7364E8
#7364E8
#E87364
#E87364
#D8E864
#D8E864
Square
Four colors evenly spaced 90° apart
#66D9E8
#66D9E8
#B564E8
#B564E8
#E87364
#E87364
#96E864
#96E864
Cyan 3 in every color space
Full conversion of Cyan 3 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
#66D9E8
RGB
rgb(102, 217, 232)
CMYK
cmyk(56%, 6%, 0%, 9%)
HSL
hsl(187, 74%, 65%)
HSV
hsv(187, 56%, 91%)
HWB
hwb(187 40% 9%)
CIE Lab
lab(80.9 -28.4 -17.3)
OKLCH
oklch(82.4% 0.106 206.8)
XYZ (D65)
xyz(44.85, 58.27, 85.21)
Copy-ready code for Cyan 3
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: #66D9E8;
background-color: #66D9E8;CSS variable
:root {
--color-cyan-3: #66D9E8;
}Tailwind config
// tailwind.config.js
colors: {
'cyan-3': '#66D9E8',
}Sass
$color-cyan-3: #66D9E8;Swift UIColor
UIColor(red: 0.400, green: 0.851, blue: 0.910, alpha: 1.0)Android XML
<color name="cyan-3">#66D9E8</color>Closest match in every color system
The nearest Cyan 3 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 Open Color
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 5024
#5D9B9B
Pastel blue
RAL 7038
#B5B8B1
Agate grey
RAL 7035
#D7D7D7
Light grey
RAL 9018
#D7D7D7
Papyrus white
RAL 7001
#8F999F
Silver grey
FAQ about Cyan 3
What is the HEX code for Cyan 3?
Cyan 3 (cyan-3) has the HEX code #66D9E8. In RGB it is rgb(102, 217, 232), and in CMYK it is cmyk(56%, 6%, 0%, 9%).
What is the OKLCH value of Cyan 3?
Cyan 3 converts to oklch(0.824 0.106 206.8). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Cyan 3 accessible for body text?
Used as a background, Cyan 3 has a contrast ratio of 12.66:1 with black text and 1.66:1 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 Cyan 3?
The closest Pantone reference to Cyan 3 by ΔE2000 perceptual distance is Pantone 305 C (#59CBE8). Cross-system Pantone matching is approximate; for color-critical print work, verify with a physical Pantone guide.
What is the closest RAL color to Cyan 3?
The closest RAL Classic reference to Cyan 3 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 Cyan 3?
The complementary color (180° opposite on the HSL color wheel) of Cyan 3 is #E87364. Use it for high-contrast accents, error states, or call-to-action pairings.
Data provenance & source
Open Color (Yeun)
Open Color, an open-source color palette by Heeyeun designed for UI designers and developers. 13 hues across 10 shades. Use as a designer-friendly palette alternative to Tailwind. Values are intentionally chosen for UI legibility and accessibility.
- Source type
- derived
- Confidence
- high
- License
- MIT
- Last reviewed
- 2026-05-24
Workflow tags
Open Color values are tuned for digital UI. For print, treat as a starting point and proof against the substrate.