#51B5CC#51B5CC

#51B5CC is a light, moderate cyan. Relative luminance 0.392; OKLCH L 72.3% C 0.098 H 215.2°. Best body text is #000000 at 8.83:1 contrast (WCAG AA passes).

Color values

HEX	#51B5CC
RGB	rgb(81, 181, 204)
HSL	hsl(191, 55%, 56%)
HSV	hsv(191, 60%, 80%)
CMYK	cmyk(60.3%, 11.3%, 0%, 20%)
CIE-LAB	lab(68.86, -22.31, -20.39)
CIE-LCH	lch(68.86, 30.22, 222.42°)
OKLab	oklab(72.28% -0.0801 -0.0566)
OKLCH	oklch(72.28% 0.098 215.2)
XYZ	xyz(30.8119, 39.1536, 63.0486)
Luminance	0.3916 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B5CC #CC6851

analogous

#51CCA6 #51B5CC #5177CC

triadic

#51B5CC #CC51B5 #B5CC51

tetradic

#51B5CC #A651CC #CC6851 #77CC51

square

#51B5CC #A651CC #CC6851 #77CC51

split-complementary

#51B5CC #CC5177 #CCA651

monochromatic

#256D7E #3396AD #51B5CC #80C9DA #B0DDE8

Accessibility & contrast

On white

2.38

#51B5CC on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.83

#51B5CC on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B5CC

8.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B5CC	#FFFFFF	#000000	##000000
##51B5CC	1.00	2.38	8.83	8.83
#FFFFFF	2.38	1.00	21.00	21.00
#000000	8.83	21.00	1.00	1.00
##000000	8.83	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A5B0CD

Deuteranopia (green-blind)

#93A2CC

Tritanopia (blue-blind)

#00BEBC

Achromatopsia (no color)

#A8A8A8

Design tokens & code

CSS

--color: #51b5cc;
/* rgb */ color: rgb(81, 181, 204);
/* oklch */ color: oklch(72.3% 0.098 215.2);

Tailwind

colors: {
  custom: {
    50: '#8ecbdb',
    500: '#51b5cc',
    950: '#000000',
  },
}

SCSS

$custom: #51b5cc;
$custom-light: #8ecbdb;
$custom-dark: #000000;

JSON

{
  "hex": "#51b5cc",
  "rgb": {
    "r": 81,
    "g": 181,
    "b": 204
  },
  "hsl": {
    "h": 191.22,
    "s": 54.667,
    "l": 55.882
  },
  "oklch": {
    "l": 0.72278,
    "c": 0.09807,
    "h": 215.2
  },
  "luminance": 0.39157
}

Semantic roles & 50–950 ramp

primary

#51B5CC

secondary

#D6ACA3

accent

#664ADE

background

#F9FCFD

surface

#F2F8FB

border

#CCD1D4

text

#0D1315

muted

#7E8283

Preview Lab

Preview with #51B5CC

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

Preview Lab → · Contrast checker → · Palette generator →