#51B8CD#51B8CD

#51B8CD is a light, moderate cyan. Relative luminance 0.404; OKLCH L 73.0% C 0.099 H 213.2°. Best body text is #000000 at 9.09:1 contrast (WCAG AA passes).

Color values

HEX	#51B8CD
RGB	rgb(81, 184, 205)
HSL	hsl(190, 55%, 56%)
HSV	hsv(190, 60%, 80%)
CMYK	cmyk(60.5%, 10.2%, 0%, 19.6%)
CIE-LAB	lab(69.78, -23.54, -19.54)
CIE-LCH	lch(69.78, 30.60, 219.70°)
OKLab	oklab(73.02% -0.0829 -0.0542)
OKLCH	oklch(73.02% 0.099 213.2)
XYZ	xyz(31.5488, 40.4349, 63.8878)
Luminance	0.4044 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B8CD #CD6651

analogous

#51CDA4 #51B8CD #517ACD

triadic

#51B8CD #CD51B8 #B8CD51

tetradic

#51B8CD #A451CD #CD6651 #7ACD51

square

#51B8CD #A451CD #CD6651 #7ACD51

split-complementary

#51B8CD #CD517A #CDA451

monochromatic

#25707F #329AAF #51B8CD #81CBDB #B0DFE8

Accessibility & contrast

On white

2.31

#51B8CD on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.09

#51B8CD on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B8CD

9.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B8CD	#FFFFFF	#000000	##000000
##51B8CD	1.00	2.31	9.09	9.09
#FFFFFF	2.31	1.00	21.00	21.00
#000000	9.09	21.00	1.00	1.00
##000000	9.09	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A8B2CE

Deuteranopia (green-blind)

#96A5CD

Tritanopia (blue-blind)

#00C0BE

Achromatopsia (no color)

#AAAAAA

Design tokens & code

CSS

--color: #51b8cd;
/* rgb */ color: rgb(81, 184, 205);
/* oklch */ color: oklch(73.0% 0.099 213.2);

Tailwind

colors: {
  custom: {
    50: '#8ecddc',
    500: '#51b8cd',
    950: '#000000',
  },
}

SCSS

$custom: #51b8cd;
$custom-light: #8ecddc;
$custom-dark: #000000;

JSON

{
  "hex": "#51b8cd",
  "rgb": {
    "r": 81,
    "g": 184,
    "b": 205
  },
  "hsl": {
    "h": 190.161,
    "s": 55.357,
    "l": 56.078
  },
  "oklch": {
    "l": 0.73025,
    "c": 0.09904,
    "h": 213.2
  },
  "luminance": 0.40438
}

Semantic roles & 50–950 ramp

primary

#51B8CD

secondary

#D7ACA3

accent

#6249DF

background

#F9FCFD

surface

#F2F9FB

border

#CCD2D4

text

#0D1315

muted

#7E8283

Preview Lab

Preview with #51B8CD

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

Preview Lab → · Contrast checker → · Palette generator →