#51B4CF#51B4CF

#51B4CF is a light, moderate cyan. Relative luminance 0.389; OKLCH L 72.2% C 0.100 H 218.6°. Best body text is #000000 at 8.78:1 contrast (WCAG AA passes).

Color values

HEX	#51B4CF
RGB	rgb(81, 180, 207)
HSL	hsl(193, 57%, 56%)
HSV	hsv(193, 61%, 81%)
CMYK	cmyk(60.9%, 13%, 0%, 18.8%)
CIE-LAB	lab(68.67, -20.90, -22.32)
CIE-LCH	lch(68.67, 30.58, 226.88°)
OKLab	oklab(72.16% -0.0778 -0.062)
OKLCH	oklch(72.16% 0.1 218.6)
XYZ	xyz(30.9726, 38.8937, 64.8944)
Luminance	0.3890 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B4CF #CF6C51

analogous

#51CFAB #51B4CF #5175CF

triadic

#51B4CF #CF51B4 #B4CF51

tetradic

#51B4CF #AB51CF #CF6C51 #75CF51

square

#51B4CF #AB51CF #CF6C51 #75CF51

split-complementary

#51B4CF #CF5175 #CFAB51

monochromatic

#246E82 #3196B2 #51B4CF #81C9DC #B1DDE9

Accessibility & contrast

On white

2.39

#51B4CF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.78

#51B4CF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B4CF

8.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B4CF	#FFFFFF	#000000	##000000
##51B4CF	1.00	2.39	8.78	8.78
#FFFFFF	2.39	1.00	21.00	21.00
#000000	8.78	21.00	1.00	1.00
##000000	8.78	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A3AFD0

Deuteranopia (green-blind)

#90A2CF

Tritanopia (blue-blind)

#00BDBC

Achromatopsia (no color)

#A7A7A7

Design tokens & code

CSS

--color: #51b4cf;
/* rgb */ color: rgb(81, 180, 207);
/* oklch */ color: oklch(72.2% 0.100 218.6);

Tailwind

colors: {
  custom: {
    50: '#8ecadd',
    500: '#51b4cf',
    950: '#000000',
  },
}

SCSS

$custom: #51b4cf;
$custom-light: #8ecadd;
$custom-dark: #000000;

JSON

{
  "hex": "#51b4cf",
  "rgb": {
    "r": 81,
    "g": 180,
    "b": 207
  },
  "hsl": {
    "h": 192.857,
    "s": 56.757,
    "l": 56.471
  },
  "oklch": {
    "l": 0.72162,
    "c": 0.09955,
    "h": 218.6
  },
  "luminance": 0.38897
}

Semantic roles & 50–950 ramp

primary

#51B4CF

secondary

#D8AFA4

accent

#6848E0

background

#F9FCFD

surface

#F2F8FB

border

#CCD1D4

text

#0D1315

muted

#7E8283

Preview Lab

Preview with #51B4CF

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

Preview Lab → · Contrast checker → · Palette generator →