#66D5EF#66D5EF

#66D5EF is a light, moderate cyan. Relative luminance 0.566; OKLCH L 81.8% C 0.107 H 215.3°. Best body text is #000000 at 12.33:1 contrast (WCAG AA passes).

Color values

HEX	#66D5EF
RGB	rgb(102, 213, 239)
HSL	hsl(191, 81%, 67%)
HSV	hsv(191, 57%, 94%)
CMYK	cmyk(57.3%, 10.9%, 0%, 6.3%)
CIE-LAB	lab(79.98, -24.44, -22.37)
CIE-LCH	lch(79.98, 33.13, 222.47°)
OKLab	oklab(81.78% -0.0874 -0.062)
OKLCH	oklch(81.78% 0.107 215.3)
XYZ	xyz(44.8475, 56.6409, 90.2140)
Luminance	0.5665 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66D5EF #EF8066

analogous

#66EFC5 #66D5EF #6691EF

triadic

#66D5EF #EF66D5 #D5EF66

tetradic

#66D5EF #C566EF #EF8066 #91EF66

square

#66D5EF #C566EF #EF8066 #91EF66

split-complementary

#66D5EF #EF6691 #EFC566

monochromatic

#15A4C6 #2FC6E9 #66D5EF #9DE4F5 #D5F3FB

Accessibility & contrast

On white

1.70

#66D5EF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

12.33

#66D5EF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66D5EF

12.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66D5EF	#FFFFFF	#000000	##000000
##66D5EF	1.00	1.70	12.33	12.33
#FFFFFF	1.70	1.00	21.00	21.00
#000000	12.33	21.00	1.00	1.00
##000000	12.33	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#C3CFF1

Deuteranopia (green-blind)

#AEC0EF

Tritanopia (blue-blind)

#00DFDD

Achromatopsia (no color)

#C6C6C6

Design tokens & code

CSS

--color: #66d5ef;
/* rgb */ color: rgb(102, 213, 239);
/* oklch */ color: oklch(81.8% 0.107 215.3);

Tailwind

colors: {
  custom: {
    50: '#9de2f4',
    500: '#66d5ef',
    950: '#000000',
  },
}

SCSS

$custom: #66d5ef;
$custom-light: #9de2f4;
$custom-dark: #000000;

JSON

{
  "hex": "#66d5ef",
  "rgb": {
    "r": 102,
    "g": 213,
    "b": 239
  },
  "hsl": {
    "h": 191.387,
    "s": 81.065,
    "l": 66.863
  },
  "oklch": {
    "l": 0.81777,
    "c": 0.10722,
    "h": 215.3
  },
  "luminance": 0.56645
}

Semantic roles & 50–950 ramp

primary

#66D5EF

secondary

#C35136

accent

#3108DD

background

#FCFEFF

surface

#F6FCFE

border

#D0D5D6

text

#0F1517

muted

#808485

Preview Lab

Preview with #66D5EF

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

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