#51D8FF#51D8FF

#51D8FF is a very light, vivid cyan. Relative luminance 0.581; OKLCH L 82.4% C 0.127 H 220.8°. Best body text is #000000 at 12.62:1 contrast (WCAG AA passes).

Color values

HEX	#51D8FF
RGB	rgb(81, 216, 255)
HSL	hsl(193, 100%, 66%)
HSV	hsv(193, 68%, 100%)
CMYK	cmyk(68.2%, 15.3%, 0%, 0%)
CIE-LAB	lab(80.78, -24.62, -29.70)
CIE-LCH	lch(80.78, 38.58, 230.35°)
OKLab	oklab(82.44% -0.0961 -0.0829)
OKLCH	oklch(82.44% 0.127 220.8)
XYZ	xyz(45.9918, 58.0759, 103.3742)
Luminance	0.5808 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51D8FF #FF7851

analogous

#51FFCF #51D8FF #5181FF

triadic

#51D8FF #FF51D8 #D8FF51

tetradic

#51D8FF #CF51FF #FF7851 #81FF51

square

#51D8FF #CF51FF #FF7851 #81FF51

split-complementary

#51D8FF #FF5181 #FFCF51

monochromatic

#00A6D6 #14CAFF #51D8FF #8EE6FF #CBF3FF

Accessibility & contrast

On white

1.66

#51D8FF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

12.62

#51D8FF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51D8FF

12.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51D8FF	#FFFFFF	#000000	##000000
##51D8FF	1.00	1.66	12.62	12.62
#FFFFFF	1.66	1.00	21.00	21.00
#000000	12.62	21.00	1.00	1.00
##000000	12.62	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#C1D3FF

Deuteranopia (green-blind)

#A8C1FF

Tritanopia (blue-blind)

#00E5E4

Achromatopsia (no color)

#C8C8C8

Design tokens & code

CSS

--color: #51d8ff;
/* rgb */ color: rgb(81, 216, 255);
/* oklch */ color: oklch(82.4% 0.127 220.8);

Tailwind

colors: {
  custom: {
    50: '#96e4ff',
    500: '#51d8ff',
    950: '#000000',
  },
}

SCSS

$custom: #51d8ff;
$custom-light: #96e4ff;
$custom-dark: #000000;

JSON

{
  "hex": "#51d8ff",
  "rgb": {
    "r": 81,
    "g": 216,
    "b": 255
  },
  "hsl": {
    "h": 193.448,
    "s": 100,
    "l": 65.882
  },
  "oklch": {
    "l": 0.82435,
    "c": 0.12691,
    "h": 220.8
  },
  "luminance": 0.58081
}

Semantic roles & 50–950 ramp

primary

#51D8FF

secondary

#D04B25

accent

#3300E6

background

#FCFEFF

surface

#F5FCFF

border

#CFD5D7

text

#0F1518

muted

#808486

Preview Lab

Preview with #51D8FF

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

Preview Lab → · Contrast checker → · Palette generator →