#66C4EB#66C4EB

#66C4EB is a light, moderate cyan. Relative luminance 0.483; OKLCH L 77.8% C 0.105 H 227.5°. Best body text is #000000 at 10.66:1 contrast (WCAG AA passes).

Color values

HEX	#66C4EB
RGB	rgb(102, 196, 235)
HSL	hsl(198, 77%, 66%)
HSV	hsv(198, 57%, 92%)
CMYK	cmyk(56.6%, 16.6%, 0%, 7.8%)
CIE-LAB	lab(75.01, -16.95, -27.80)
CIE-LCH	lch(75.01, 32.56, 238.63°)
OKLab	oklab(77.76% -0.0709 -0.0774)
OKLCH	oklch(77.76% 0.105 227.5)
XYZ	xyz(40.2091, 48.2990, 85.7848)
Luminance	0.4830 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66C4EB #EB8D66

analogous

#66EBCF #66C4EB #6681EB

triadic

#66C4EB #EB66C4 #C4EB66

tetradic

#66C4EB #CF66EB #EB8D66 #81EB66

square

#66C4EB #CF66EB #EB8D66 #81EB66

split-complementary

#66C4EB #EB6681 #EBCF66

monochromatic

#198DBE #30AFE4 #66C4EB #9CD9F2 #D2EEF9

Accessibility & contrast

On white

1.97

#66C4EB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

10.66

#66C4EB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66C4EB

10.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66C4EB	#FFFFFF	#000000	##000000
##66C4EB	1.00	1.97	10.66	10.66
#FFFFFF	1.97	1.00	21.00	21.00
#000000	10.66	21.00	1.00	1.00
##000000	10.66	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#AFC1ED

Deuteranopia (green-blind)

#9CB2EB

Tritanopia (blue-blind)

#00CFD1

Achromatopsia (no color)

#B9B9B9

Design tokens & code

CSS

--color: #66c4eb;
/* rgb */ color: rgb(102, 196, 235);
/* oklch */ color: oklch(77.8% 0.105 227.5);

Tailwind

colors: {
  custom: {
    50: '#9cd6f1',
    500: '#66c4eb',
    950: '#000000',
  },
}

SCSS

$custom: #66c4eb;
$custom-light: #9cd6f1;
$custom-dark: #000000;

JSON

{
  "hex": "#66c4eb",
  "rgb": {
    "r": 102,
    "g": 196,
    "b": 235
  },
  "hsl": {
    "h": 197.594,
    "s": 76.879,
    "l": 66.078
  },
  "oklch": {
    "l": 0.77763,
    "c": 0.10494,
    "h": 227.5
  },
  "luminance": 0.48303
}

Semantic roles & 50–950 ramp

primary

#66C4EB

secondary

#ECCDC1

accent

#480CD9

background

#FAFDFE

surface

#F4FAFD

border

#CED3D5

text

#0F1416

muted

#7F8384

Preview Lab

Preview with #66C4EB

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →