#66C4EF#66C4EF

#66C4EF is a light, moderate cyan. Relative luminance 0.485; OKLCH L 77.9% C 0.108 H 230.0°. Best body text is #000000 at 10.71:1 contrast (WCAG AA passes).

Color values

HEX	#66C4EF
RGB	rgb(102, 196, 239)
HSL	hsl(199, 81%, 67%)
HSV	hsv(199, 57%, 94%)
CMYK	cmyk(57.3%, 18%, 0%, 6.3%)
CIE-LAB	lab(75.16, -15.77, -29.73)
CIE-LCH	lch(75.16, 33.66, 242.05°)
OKLab	oklab(77.93% -0.0694 -0.0829)
OKLCH	oklch(77.93% 0.108 230)
XYZ	xyz(40.7934, 48.5328, 88.8626)
Luminance	0.4854 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66C4EF #EF9166

analogous

#66EFD6 #66C4EF #6680EF

triadic

#66C4EF #EF66C4 #C4EF66

tetradic

#66C4EF #D666EF #EF9166 #80EF66

square

#66C4EF #D666EF #EF9166 #80EF66

split-complementary

#66C4EF #EF6680 #EFD666

monochromatic

#158EC6 #2FAFE9 #66C4EF #9DD9F5 #D5EFFB

Accessibility & contrast

On white

1.96

#66C4EF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

10.71

#66C4EF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66C4EF

10.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66C4EF	#FFFFFF	#000000	##000000
##66C4EF	1.00	1.96	10.71	10.71
#FFFFFF	1.96	1.00	21.00	21.00
#000000	10.71	21.00	1.00	1.00
##000000	10.71	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#AEC1F1

Deuteranopia (green-blind)

#9BB3EE

Tritanopia (blue-blind)

#00D0D2

Achromatopsia (no color)

#B9B9B9

Design tokens & code

CSS

--color: #66c4ef;
/* rgb */ color: rgb(102, 196, 239);
/* oklch */ color: oklch(77.9% 0.108 230.0);

Tailwind

colors: {
  custom: {
    50: '#9cd5f4',
    500: '#66c4ef',
    950: '#000000',
  },
}

SCSS

$custom: #66c4ef;
$custom-light: #9cd5f4;
$custom-dark: #000000;

JSON

{
  "hex": "#66c4ef",
  "rgb": {
    "r": 102,
    "g": 196,
    "b": 239
  },
  "hsl": {
    "h": 198.832,
    "s": 81.065,
    "l": 66.863
  },
  "oklch": {
    "l": 0.77928,
    "c": 0.10812,
    "h": 230
  },
  "luminance": 0.48537
}

Semantic roles & 50–950 ramp

primary

#66C4EF

secondary

#EED0C2

accent

#4B08DD

background

#FAFDFE

surface

#F4FAFD

border

#CED3D5

text

#0F1417

muted

#7F8385

Preview Lab

Preview with #66C4EF

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

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