#51BDE4#51BDE4

#51BDE4 is a light, moderate cyan. Relative luminance 0.437; OKLCH L 75.1% C 0.113 H 225.2°. Best body text is #000000 at 9.75:1 contrast (WCAG AA passes).

Color values

HEX#51BDE4
RGBrgb(81, 189, 228)
HSLhsl(196, 73%, 61%)
HSVhsv(196, 64%, 89%)
CMYKcmyk(64.5%, 17.1%, 0%, 10.6%)
CIE-LABlab(72.06, -19.17, -28.61)
CIE-LCHlch(72.06, 34.44, 236.18°)
OKLaboklab(75.12% -0.0793 -0.0799)
OKLCHoklch(75.12% 0.113 225.2)
XYZxyz(35.5889, 43.7422, 79.9512)
Luminance0.4375 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#51BDE4 #E47851
analogous
#51E4C1 #51BDE4 #5174E4
triadic
#51BDE4 #E451BD #BDE451
tetradic
#51BDE4 #C151E4 #E47851 #74E451
square
#51BDE4 #C151E4 #E47851 #74E451
split-complementary
#51BDE4 #E45174 #E4C151
monochromatic
#197DA2 #21A6D7 #51BDE4 #86D1EC #BBE5F4

Accessibility & contrast

On white

2.15
#51BDE4 on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

9.75
#51BDE4 on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BDE4
9.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##51BDE4#FFFFFF#000000##000000
##51BDE41.002.159.759.75
#FFFFFF2.151.0021.0021.00
#0000009.7521.001.001.00
##0000009.7521.001.001.00

Color blindness preview

Protanopia (red-blind)
#A8B9E6
Deuteranopia (green-blind)
#93AAE4
Tritanopia (blue-blind)
#00C9CA
Achromatopsia (no color)
#B1B1B1

Design tokens & code

CSS
--color: #51bde4;
/* rgb */ color: rgb(81, 189, 228);
/* oklch */ color: oklch(75.1% 0.113 225.2);
Tailwind
colors: {
  custom: {
    50: '#91d1ec',
    500: '#51bde4',
    950: '#000000',
  },
}
SCSS
$custom: #51bde4;
$custom-light: #91d1ec;
$custom-dark: #000000;
JSON
{
  "hex": "#51bde4",
  "rgb": {
    "r": 81,
    "g": 189,
    "b": 228
  },
  "hsl": {
    "h": 195.918,
    "s": 73.134,
    "l": 60.588
  },
  "oklch": {
    "l": 0.75122,
    "c": 0.11256,
    "h": 225.2
  },
  "luminance": 0.43746
}

Semantic roles & 50–950 ramp

primary
#51BDE4
secondary
#E4BBAC
accent
#4510D5
background
#F9FCFE
surface
#F2F9FD
border
#CCD2D5
text
#0E1416
muted
#7E8284

Preview Lab

Preview with #51BDE4

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

Preview Lab → · Contrast checker → · Palette generator →

#51BDE4 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva