#66C5EF#66C5EF

#66C5EF is a light, moderate cyan. Relative luminance 0.490; OKLCH L 78.2% C 0.108 H 229.2°. Best body text is #000000 at 10.80:1 contrast (WCAG AA passes).

Color values

HEX	#66C5EF
RGB	rgb(102, 197, 239)
HSL	hsl(198, 81%, 67%)
HSV	hsv(198, 57%, 94%)
CMYK	cmyk(57.3%, 17.6%, 0%, 6.3%)
CIE-LAB	lab(75.44, -16.30, -29.30)
CIE-LCH	lch(75.44, 33.52, 240.92°)
OKLab	oklab(78.15% -0.0705 -0.0816)
OKLCH	oklch(78.15% 0.108 229.2)
XYZ	xyz(41.0197, 48.9854, 88.9380)
Luminance	0.4899 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66C5EF #EF9066

analogous

#66EFD4 #66C5EF #6681EF

triadic

#66C5EF #EF66C5 #C5EF66

tetradic

#66C5EF #D466EF #EF9066 #81EF66

square

#66C5EF #D466EF #EF9066 #81EF66

split-complementary

#66C5EF #EF6681 #EFD466

monochromatic

#1590C6 #2FB0E9 #66C5EF #9DDAF5 #D5EFFB

Accessibility & contrast

On white

1.94

#66C5EF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

10.80

#66C5EF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66C5EF

10.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66C5EF	#FFFFFF	#000000	##000000
##66C5EF	1.00	1.94	10.80	10.80
#FFFFFF	1.94	1.00	21.00	21.00
#000000	10.80	21.00	1.00	1.00
##000000	10.80	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#AFC2F1

Deuteranopia (green-blind)

#9CB4EE

Tritanopia (blue-blind)

#00D1D3

Achromatopsia (no color)

#BABABA

Design tokens & code

CSS

--color: #66c5ef;
/* rgb */ color: rgb(102, 197, 239);
/* oklch */ color: oklch(78.2% 0.108 229.2);

Tailwind

colors: {
  custom: {
    50: '#9cd6f4',
    500: '#66c5ef',
    950: '#000000',
  },
}

SCSS

$custom: #66c5ef;
$custom-light: #9cd6f4;
$custom-dark: #000000;

JSON

{
  "hex": "#66c5ef",
  "rgb": {
    "r": 102,
    "g": 197,
    "b": 239
  },
  "hsl": {
    "h": 198.394,
    "s": 81.065,
    "l": 66.863
  },
  "oklch": {
    "l": 0.78153,
    "c": 0.10788,
    "h": 229.2
  },
  "luminance": 0.48989
}

Semantic roles & 50–950 ramp

primary

#66C5EF

secondary

#EED0C2

accent

#4908DD

background

#FAFDFE

surface

#F4FAFD

border

#CED3D5

text

#0F1417

muted

#7F8385

Preview Lab

Preview with #66C5EF

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

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