#51B5CD#51B5CD

#51B5CD is a light, moderate cyan. Relative luminance 0.392; OKLCH L 72.3% C 0.099 H 216.0°. Best body text is #000000 at 8.84:1 contrast (WCAG AA passes).

Color values

HEX	#51B5CD
RGB	rgb(81, 181, 205)
HSL	hsl(192, 55%, 56%)
HSV	hsv(192, 60%, 80%)
CMYK	cmyk(60.5%, 11.7%, 0%, 19.6%)
CIE-LAB	lab(68.90, -22.01, -20.88)
CIE-LCH	lch(68.90, 30.34, 223.49°)
OKLab	oklab(72.32% -0.0797 -0.058)
OKLCH	oklch(72.32% 0.099 216)
XYZ	xyz(30.9322, 39.2017, 63.6823)
Luminance	0.3921 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B5CD #CD6951

analogous

#51CDA7 #51B5CD #5177CD

triadic

#51B5CD #CD51B5 #B5CD51

tetradic

#51B5CD #A751CD #CD6951 #77CD51

square

#51B5CD #A751CD #CD6951 #77CD51

split-complementary

#51B5CD #CD5177 #CDA751

monochromatic

#256E7F #3297AF #51B5CD #81C9DB #B0DDE8

Accessibility & contrast

On white

2.38

#51B5CD on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.84

#51B5CD on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B5CD

8.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B5CD	#FFFFFF	#000000	##000000
##51B5CD	1.00	2.38	8.84	8.84
#FFFFFF	2.38	1.00	21.00	21.00
#000000	8.84	21.00	1.00	1.00
##000000	8.84	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A5B0CE

Deuteranopia (green-blind)

#92A2CD

Tritanopia (blue-blind)

#00BEBC

Achromatopsia (no color)

#A8A8A8

Design tokens & code

CSS

--color: #51b5cd;
/* rgb */ color: rgb(81, 181, 205);
/* oklch */ color: oklch(72.3% 0.099 216.0);

Tailwind

colors: {
  custom: {
    50: '#8ecbdc',
    500: '#51b5cd',
    950: '#000000',
  },
}

SCSS

$custom: #51b5cd;
$custom-light: #8ecbdc;
$custom-dark: #000000;

JSON

{
  "hex": "#51b5cd",
  "rgb": {
    "r": 81,
    "g": 181,
    "b": 205
  },
  "hsl": {
    "h": 191.613,
    "s": 55.357,
    "l": 56.078
  },
  "oklch": {
    "l": 0.72318,
    "c": 0.09856,
    "h": 216
  },
  "luminance": 0.39205
}

Semantic roles & 50–950 ramp

primary

#51B5CD

secondary

#D7ADA3

accent

#6649DF

background

#F9FCFD

surface

#F2F8FB

border

#CCD1D4

text

#0D1315

muted

#7E8283

Preview Lab

Preview with #51B5CD

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

Preview Lab → · Contrast checker → · Palette generator →