#66B4EB#66B4EB

#66B4EB is a light, moderate cyan. Relative luminance 0.415; OKLCH L 74.2% C 0.111 H 241.2°. Best body text is #000000 at 9.29:1 contrast (WCAG AA passes).

Color values

HEX	#66B4EB
RGB	rgb(102, 180, 235)
HSL	hsl(205, 77%, 66%)
HSV	hsv(205, 57%, 92%)
CMYK	cmyk(56.6%, 23.4%, 0%, 7.8%)
CIE-LAB	lab(70.50, -8.45, -34.76)
CIE-LCH	lch(70.50, 35.77, 256.34°)
OKLab	oklab(74.18% -0.0536 -0.0973)
OKLCH	oklch(74.18% 0.111 241.2)
XYZ	xyz(36.7906, 41.4622, 84.6453)
Luminance	0.4147 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66B4EB #EB9D66

analogous

#66EBDF #66B4EB #6671EB

triadic

#66B4EB #EB66B4 #B4EB66

tetradic

#66B4EB #DF66EB #EB9D66 #71EB66

square

#66B4EB #DF66EB #EB9D66 #71EB66

split-complementary

#66B4EB #EB6671 #EBDF66

monochromatic

#197ABE #3099E4 #66B4EB #9CCFF2 #D2E9F9

Accessibility & contrast

On white

2.26

#66B4EB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.29

#66B4EB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66B4EB

9.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66B4EB	#FFFFFF	#000000	##000000
##66B4EB	1.00	2.26	9.29	9.29
#FFFFFF	2.26	1.00	21.00	21.00
#000000	9.29	21.00	1.00	1.00
##000000	9.29	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9CB4EE

Deuteranopia (green-blind)

#8AA6EA

Tritanopia (blue-blind)

#00C2C7

Achromatopsia (no color)

#ACACAC

Design tokens & code

CSS

--color: #66b4eb;
/* rgb */ color: rgb(102, 180, 235);
/* oklch */ color: oklch(74.2% 0.111 241.2);

Tailwind

colors: {
  custom: {
    50: '#9bcaf1',
    500: '#66b4eb',
    950: '#000000',
  },
}

SCSS

$custom: #66b4eb;
$custom-light: #9bcaf1;
$custom-dark: #000000;

JSON

{
  "hex": "#66b4eb",
  "rgb": {
    "r": 102,
    "g": 180,
    "b": 235
  },
  "hsl": {
    "h": 204.812,
    "s": 76.879,
    "l": 66.078
  },
  "oklch": {
    "l": 0.74177,
    "c": 0.11111,
    "h": 241.2
  },
  "luminance": 0.41465
}

Semantic roles & 50–950 ramp

primary

#66B4EB

secondary

#ECD3C1

accent

#610CD9

background

#FAFCFE

surface

#F3F8FD

border

#CDD1D5

text

#0F1316

muted

#7F8284

Preview Lab

Preview with #66B4EB

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

Preview Lab → · Contrast checker → · Palette generator →