#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
RGBrgb(81, 184, 205)
HSLhsl(190, 55%, 56%)
HSVhsv(190, 60%, 80%)
CMYKcmyk(60.5%, 10.2%, 0%, 19.6%)
CIE-LABlab(69.78, -23.54, -19.54)
CIE-LCHlch(69.78, 30.60, 219.70°)
OKLaboklab(73.02% -0.0829 -0.0542)
OKLCHoklch(73.02% 0.099 213.2)
XYZxyz(31.5488, 40.4349, 63.8878)
Luminance0.4044 (WCAG relative)
Temperaturecool
Familycyan

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
##51B8CD1.002.319.099.09
#FFFFFF2.311.0021.0021.00
#0000009.0921.001.001.00
##0000009.0921.001.001.00

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 →

#51B8CD Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva