#51C3E9#51C3E9

#51C3E9 is a light, moderate cyan. Relative luminance 0.467; OKLCH L 76.7% C 0.115 H 223.5°. Best body text is #000000 at 10.33:1 contrast (WCAG AA passes).

Color values

HEX#51C3E9
RGBrgb(81, 195, 233)
HSLhsl(195, 78%, 62%)
HSVhsv(195, 65%, 91%)
CMYKcmyk(65.2%, 16.3%, 0%, 8.6%)
CIE-LABlab(73.97, -20.73, -28.38)
CIE-LCHlch(73.97, 35.14, 233.86°)
OKLaboklab(76.72% -0.0835 -0.0792)
OKLCHoklch(76.72% 0.115 223.5)
XYZxyz(37.6105, 46.6587, 84.0989)
Luminance0.4666 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#51C3E9 #E97751
analogous
#51E9C3 #51C3E9 #5177E9
triadic
#51C3E9 #E951C3 #C3E951
tetradic
#51C3E9 #C351E9 #E97751 #77E951
square
#51C3E9 #C351E9 #E97751 #77E951
split-complementary
#51C3E9 #E95177 #E9C351
monochromatic
#1685AA #1CAFE0 #51C3E9 #87D6F0 #BEE8F7

Accessibility & contrast

On white

2.03
#51C3E9 on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

10.33
#51C3E9 on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51C3E9
10.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##51C3E9#FFFFFF#000000##000000
##51C3E91.002.0310.3310.33
#FFFFFF2.031.0021.0021.00
#00000010.3321.001.001.00
##00000010.3321.001.001.00

Color blindness preview

Protanopia (red-blind)
#ADBFEB
Deuteranopia (green-blind)
#98AFE9
Tritanopia (blue-blind)
#00CFCF
Achromatopsia (no color)
#B6B6B6

Design tokens & code

CSS
--color: #51c3e9;
/* rgb */ color: rgb(81, 195, 233);
/* oklch */ color: oklch(76.7% 0.115 223.5);
Tailwind
colors: {
  custom: {
    50: '#92d5f0',
    500: '#51c3e9',
    950: '#000000',
  },
}
SCSS
$custom: #51c3e9;
$custom-light: #92d5f0;
$custom-dark: #000000;
JSON
{
  "hex": "#51c3e9",
  "rgb": {
    "r": 81,
    "g": 195,
    "b": 233
  },
  "hsl": {
    "h": 195,
    "s": 77.551,
    "l": 61.569
  },
  "oklch": {
    "l": 0.76715,
    "c": 0.11511,
    "h": 223.5
  },
  "luminance": 0.46663
}

Semantic roles & 50–950 ramp

primary
#51C3E9
secondary
#E7BDAF
accent
#3F0CDA
background
#F9FDFE
surface
#F2FAFD
border
#CCD3D5
text
#0E1416
muted
#7E8384

Preview Lab

Preview with #51C3E9

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

Preview Lab → · Contrast checker → · Palette generator →

#51C3E9 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva