#51C9EE#51C9EE

#51C9EE is a light, moderate cyan. Relative luminance 0.497; OKLCH L 78.3% C 0.118 H 221.9°. Best body text is #000000 at 10.94:1 contrast (WCAG AA passes).

Color values

HEX#51C9EE
RGBrgb(81, 201, 238)
HSLhsl(194, 82%, 63%)
HSVhsv(194, 66%, 93%)
CMYKcmyk(66%, 15.5%, 0%, 6.7%)
CIE-LABlab(75.88, -22.26, -28.14)
CIE-LCHlch(75.88, 35.88, 231.66°)
OKLaboklab(78.3% -0.0877 -0.0785)
OKLCHoklch(78.3% 0.118 221.9)
XYZxyz(39.7063, 49.6913, 88.3711)
Luminance0.4970 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#51C9EE #EE7651
analogous
#51EEC4 #51C9EE #517BEE
triadic
#51C9EE #EE51C9 #C9EE51
tetradic
#51C9EE #C451EE #EE7651 #7BEE51
square
#51C9EE #C451EE #EE7651 #7BEE51
split-complementary
#51C9EE #EE517B #EEC451
monochromatic
#118DB3 #19B8E9 #51C9EE #89DAF3 #C1ECF9

Accessibility & contrast

On white

1.92
#51C9EE on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

10.94
#51C9EE on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51C9EE
10.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##51C9EE#FFFFFF#000000##000000
##51C9EE1.001.9210.9410.94
#FFFFFF1.921.0021.0021.00
#00000010.9421.001.001.00
##00000010.9421.001.001.00

Color blindness preview

Protanopia (red-blind)
#B3C4F0
Deuteranopia (green-blind)
#9DB4EE
Tritanopia (blue-blind)
#00D5D5
Achromatopsia (no color)
#BBBBBB

Design tokens & code

CSS
--color: #51c9ee;
/* rgb */ color: rgb(81, 201, 238);
/* oklch */ color: oklch(78.3% 0.118 221.9);
Tailwind
colors: {
  custom: {
    50: '#93d9f3',
    500: '#51c9ee',
    950: '#000000',
  },
}
SCSS
$custom: #51c9ee;
$custom-light: #93d9f3;
$custom-dark: #000000;
JSON
{
  "hex": "#51c9ee",
  "rgb": {
    "r": 81,
    "g": 201,
    "b": 238
  },
  "hsl": {
    "h": 194.14,
    "s": 82.199,
    "l": 62.549
  },
  "oklch": {
    "l": 0.78304,
    "c": 0.1177,
    "h": 221.9
  },
  "luminance": 0.49696
}

Semantic roles & 50–950 ramp

primary
#51C9EE
secondary
#EABEB1
accent
#3A07DF
background
#F9FDFE
surface
#F2FAFD
border
#CCD3D5
text
#0E1417
muted
#7E8385

Preview Lab

Preview with #51C9EE

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

Preview Lab → · Contrast checker → · Palette generator →

#51C9EE Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva