#66C9FF#66C9FF

#66C9FF is a light, vivid cyan. Relative luminance 0.518; OKLCH L 79.7% C 0.120 H 234.9°. Best body text is #000000 at 11.36:1 contrast (WCAG AA passes).

Color values

HEX	#66C9FF
RGB	rgb(102, 201, 255)
HSL	hsl(201, 100%, 70%)
HSV	hsv(201, 60%, 100%)
CMYK	cmyk(60%, 21.2%, 0%, 0%)
CIE-LAB	lab(77.17, -13.61, -35.22)
CIE-LCH	lch(77.17, 37.75, 248.87°)
OKLab	oklab(79.73% -0.0692 -0.0985)
OKLCH	oklch(79.73% 0.12 234.9)
XYZ	xyz(44.4092, 51.8137, 102.2490)
Luminance	0.5182 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66C9FF #FF9C66

analogous

#66FFE8 #66C9FF #667DFF

triadic

#66C9FF #FF66C9 #C9FF66

tetradic

#66C9FF #E866FF #FF9C66 #7DFF66

square

#66C9FF #E866FF #FF9C66 #7DFF66

split-complementary

#66C9FF #FF667D #FFE866

monochromatic

#0098EB #29B3FF #66C9FF #A3DFFF #E0F4FF

Accessibility & contrast

On white

1.85

#66C9FF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

11.36

#66C9FF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66C9FF

11.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66C9FF	#FFFFFF	#000000	##000000
##66C9FF	1.00	1.85	11.36	11.36
#FFFFFF	1.85	1.00	21.00	21.00
#000000	11.36	21.00	1.00	1.00
##000000	11.36	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#AFC7FF

Deuteranopia (green-blind)

#9AB8FE

Tritanopia (blue-blind)

#00D7DB

Achromatopsia (no color)

#BFBFBF

Design tokens & code

CSS

--color: #66c9ff;
/* rgb */ color: rgb(102, 201, 255);
/* oklch */ color: oklch(79.7% 0.120 234.9);

Tailwind

colors: {
  custom: {
    50: '#9ed9ff',
    500: '#66c9ff',
    950: '#000000',
  },
}

SCSS

$custom: #66c9ff;
$custom-light: #9ed9ff;
$custom-dark: #000000;

JSON

{
  "hex": "#66c9ff",
  "rgb": {
    "r": 102,
    "g": 201,
    "b": 255
  },
  "hsl": {
    "h": 201.176,
    "s": 100,
    "l": 70
  },
  "oklch": {
    "l": 0.79726,
    "c": 0.12041,
    "h": 234.9
  },
  "luminance": 0.51818
}

Semantic roles & 50–950 ramp

primary

#66C9FF

secondary

#DA6B2F

accent

#5100E6

background

#FCFEFF

surface

#F6FBFF

border

#D0D4D7

text

#101418

muted

#808386

Preview Lab

Preview with #66C9FF

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

Preview Lab → · Contrast checker → · Palette generator →