#66B5EA#66B5EA

#66B5EA is a light, moderate cyan. Relative luminance 0.418; OKLCH L 74.4% C 0.110 H 239.8°. Best body text is #000000 at 9.36:1 contrast (WCAG AA passes).

Color values

HEX	#66B5EA
RGB	rgb(102, 181, 234)
HSL	hsl(204, 76%, 66%)
HSV	hsv(204, 56%, 92%)
CMYK	cmyk(56.4%, 22.6%, 0%, 8.2%)
CIE-LAB	lab(70.74, -9.29, -33.85)
CIE-LCH	lch(70.74, 35.10, 254.65°)
OKLab	oklab(74.36% -0.055 -0.0947)
OKLCH	oklch(74.36% 0.11 239.8)
XYZ	xyz(36.8491, 41.8097, 83.9541)
Luminance	0.4181 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66B5EA #EA9B66

analogous

#66EADD #66B5EA #6673EA

triadic

#66B5EA #EA66B5 #B5EA66

tetradic

#66B5EA #DD66EA #EA9B66 #73EA66

square

#66B5EA #DD66EA #EA9B66 #73EA66

split-complementary

#66B5EA #EA6673 #EADD66

monochromatic

#1A7BBC #309BE3 #66B5EA #9CCFF1 #D2E9F9

Accessibility & contrast

On white

2.24

#66B5EA on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.36

#66B5EA on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66B5EA

9.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66B5EA	#FFFFFF	#000000	##000000
##66B5EA	1.00	2.24	9.36	9.36
#FFFFFF	2.24	1.00	21.00	21.00
#000000	9.36	21.00	1.00	1.00
##000000	9.36	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9DB5EC

Deuteranopia (green-blind)

#8BA7E9

Tritanopia (blue-blind)

#00C2C7

Achromatopsia (no color)

#ADADAD

Design tokens & code

CSS

--color: #66b5ea;
/* rgb */ color: rgb(102, 181, 234);
/* oklch */ color: oklch(74.4% 0.110 239.8);

Tailwind

colors: {
  custom: {
    50: '#9bcbf1',
    500: '#66b5ea',
    950: '#000000',
  },
}

SCSS

$custom: #66b5ea;
$custom-light: #9bcbf1;
$custom-dark: #000000;

JSON

{
  "hex": "#66b5ea",
  "rgb": {
    "r": 102,
    "g": 181,
    "b": 234
  },
  "hsl": {
    "h": 204.091,
    "s": 75.862,
    "l": 65.882
  },
  "oklch": {
    "l": 0.74355,
    "c": 0.10951,
    "h": 239.8
  },
  "luminance": 0.41813
}

Semantic roles & 50–950 ramp

primary

#66B5EA

secondary

#ECD2C0

accent

#5F0DD8

background

#FAFCFE

surface

#F3F8FD

border

#CDD1D5

text

#0F1316

muted

#7F8284

Preview Lab

Preview with #66B5EA

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

Preview Lab → · Contrast checker → · Palette generator →