#66C9FB#66C9FB

#66C9FB is a light, moderate cyan. Relative luminance 0.516; OKLCH L 79.6% C 0.117 H 232.9°. Best body text is #000000 at 11.31:1 contrast (WCAG AA passes).

Color values

HEX	#66C9FB
RGB	rgb(102, 201, 251)
HSL	hsl(200, 95%, 69%)
HSV	hsv(200, 59%, 98%)
CMYK	cmyk(59.4%, 19.9%, 0%, 1.6%)
CIE-LAB	lab(77.02, -14.81, -33.31)
CIE-LCH	lch(77.02, 36.46, 246.03°)
OKLab	oklab(79.55% -0.0705 -0.0931)
OKLCH	oklch(79.55% 0.117 232.9)
XYZ	xyz(43.7720, 51.5589, 98.8932)
Luminance	0.5156 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66C9FB #FB9866

analogous

#66FBE2 #66C9FB #667FFB

triadic

#66C9FB #FB66C9 #C9FB66

tetradic

#66C9FB #E266FB #FB9866 #7FFB66

square

#66C9FB #E266FB #FB9866 #7FFB66

split-complementary

#66C9FB #FB667F #FBE266

monochromatic

#0697E1 #2AB4F9 #66C9FB #A2DEFD #DDF3FE

Accessibility & contrast

On white

1.86

#66C9FB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

11.31

#66C9FB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #66C9FB

11.31:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66C9FB	#FFFFFF	#000000	##000000
##66C9FB	1.00	1.86	11.31	11.31
#FFFFFF	1.86	1.00	21.00	21.00
#000000	11.31	21.00	1.00	1.00
##000000	11.31	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#B1C7FD

Deuteranopia (green-blind)

#9CB7FA

Tritanopia (blue-blind)

#00D6DA

Achromatopsia (no color)

#BEBEBE

Design tokens & code

CSS

--color: #66c9fb;
/* rgb */ color: rgb(102, 201, 251);
/* oklch */ color: oklch(79.6% 0.117 232.9);

Tailwind

colors: {
  custom: {
    50: '#9dd9fc',
    500: '#66c9fb',
    950: '#000000',
  },
}

SCSS

$custom: #66c9fb;
$custom-light: #9dd9fc;
$custom-dark: #000000;

JSON

{
  "hex": "#66c9fb",
  "rgb": {
    "r": 102,
    "g": 201,
    "b": 251
  },
  "hsl": {
    "h": 200.134,
    "s": 94.904,
    "l": 69.216
  },
  "oklch": {
    "l": 0.79554,
    "c": 0.1168,
    "h": 232.9
  },
  "luminance": 0.51563
}

Semantic roles & 50–950 ramp

primary

#66C9FB

secondary

#D56730

accent

#4D00E6

background

#FCFEFF

surface

#F6FBFF

border

#D0D4D7

text

#0F1417

muted

#808385

Preview Lab

Preview with #66C9FB

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

Preview Lab → · Contrast checker → · Palette generator →