Cyan 4
cyan-4 · #3BC9DB
HEX
#3BC9DB
RGB
rgb(59, 201, 219)
CMYK
cmyk(73%, 8%, 0%, 14%)
HSL
hsl(187, 69%, 55%)
LAB
lab(74.7, -31.0, -19.7)
What is Cyan 4?
Cyan 4 is the cyan-4 reference in the Open Color. Its sRGB value is #3BC9DB (rgb 59, 201, 219). 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 4 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Cyan 4
An 11-step tonal scale derived from Cyan 4 (#3BC9DB). 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
#EFFBFC
#EFFBFC
100
#E0F6F9
#E0F6F9
200
#C0EEF3
#C0EEF3
300
#9DE4ED
#9DE4ED
400
#6CD7E4
#6CD7E4
500
#3BC9DB
#3BC9DB
600
#32ABBA
#32ABBA
700
#26838E
#26838E
800
#1B5A63
#1B5A63
900
#0F3237
#0F3237
950
#07181A
#07181A
Lighter tints (mixed with white)
15%
#78D2E1
30%
#9CDBE7
45%
#B7E3EC
60%
#CEEBF1
75%
#E2F3F7
Darker shades (mixed with black)
15%
#36BBCC
30%
#31ABBB
45%
#2B9AA8
60%
#248591
75%
#1B6B75
Color harmonies for Cyan 4
Classic color-theory harmonies derived from rotating the hue of Cyan 4. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#3BC9DB
#3BC9DB
#DB503D
#DB503D
Triadic
Three colors 120° apart
#3BC9DB
#3BC9DB
#DB3DC9
#DB3DC9
#C9DB3D
#C9DB3D
Analogous
Two neighbors ±30° on the wheel
#3DDB9F
#3DDB9F
#3BC9DB
#3BC9DB
#3D7ADB
#3D7ADB
Split-complementary
Base + two colors flanking its complement
#3BC9DB
#3BC9DB
#DB3D7A
#DB3D7A
#DB9F3D
#DB9F3D
Tetradic
Two complementary pairs
#3BC9DB
#3BC9DB
#503DDB
#503DDB
#DB503D
#DB503D
#C9DB3D
#C9DB3D
Square
Four colors evenly spaced 90° apart
#3BC9DB
#3BC9DB
#9F3DDB
#9F3DDB
#DB503D
#DB503D
#7ADB3D
#7ADB3D
Cyan 4 in every color space
Full conversion of Cyan 4 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
#3BC9DB
RGB
rgb(59, 201, 219)
CMYK
cmyk(73%, 8%, 0%, 14%)
HSL
hsl(187, 69%, 55%)
HSV
hsv(187, 73%, 86%)
HWB
hwb(187 23% 14%)
CIE Lab
lab(74.7 -31.0 -19.7)
OKLCH
oklch(77.0% 0.119 207.6)
XYZ (D65)
xyz(35.47, 47.81, 74.36)
Copy-ready code for Cyan 4
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: #3BC9DB;
background-color: #3BC9DB;CSS variable
:root {
--color-cyan-4: #3BC9DB;
}Tailwind config
// tailwind.config.js
colors: {
'cyan-4': '#3BC9DB',
}Sass
$color-cyan-4: #3BC9DB;Swift UIColor
UIColor(red: 0.231, green: 0.788, blue: 0.859, alpha: 1.0)Android XML
<color name="cyan-4">#3BC9DB</color>Closest match in every color system
The nearest Cyan 4 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 5018
#3F888F
Turquoise blue
RAL 7001
#8F999F
Silver grey
RAL 7038
#B5B8B1
Agate grey
RAL 7004
#9EA0A1
Signal grey
FAQ about Cyan 4
What is the HEX code for Cyan 4?
Cyan 4 (cyan-4) has the HEX code #3BC9DB. In RGB it is rgb(59, 201, 219), and in CMYK it is cmyk(73%, 8%, 0%, 14%).
What is the OKLCH value of Cyan 4?
Cyan 4 converts to oklch(0.770 0.119 207.6). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Cyan 4 accessible for body text?
Used as a background, Cyan 4 has a contrast ratio of 10.56:1 with black text and 1.99:1 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 4?
The closest Pantone reference to Cyan 4 by ΔE2000 perceptual distance is Pantone 3115 C (#00C1D5). 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 4?
The closest RAL Classic reference to Cyan 4 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 4?
The complementary color (180° opposite on the HSL color wheel) of Cyan 4 is #DB503D. 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.