#51B4DF#51B4DF

#51B4DF is a light, moderate cyan. Relative luminance 0.397; OKLCH L 72.8% C 0.111 H 229.6°. Best body text is #000000 at 8.94:1 contrast (WCAG AA passes).

Color values

HEX#51B4DF
RGBrgb(81, 180, 223)
HSLhsl(198, 69%, 60%)
HSVhsv(198, 64%, 87%)
CMYKcmyk(63.7%, 19.3%, 0%, 12.5%)
CIE-LABlab(69.27, -16.01, -30.18)
CIE-LCHlch(69.27, 34.17, 242.06°)
OKLaboklab(72.83% -0.0719 -0.0844)
OKLCHoklch(72.83% 0.111 229.6)
XYZxyz(33.0286, 39.7161, 75.7231)
Luminance0.3972 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#51B4DF #DF7C51
analogous
#51DFC3 #51B4DF #516DDF
triadic
#51B4DF #DF51B4 #B4DF51
tetradic
#51B4DF #C351DF #DF7C51 #6DDF51
square
#51B4DF #C351DF #DF7C51 #6DDF51
split-complementary
#51B4DF #DF516D #DFC351
monochromatic
#1C7399 #269ACD #51B4DF #85CAE9 #B8E1F2

Accessibility & contrast

On white

2.35
#51B4DF on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

8.94
#51B4DF on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B4DF
8.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##51B4DF#FFFFFF#000000##000000
##51B4DF1.002.358.948.94
#FFFFFF2.351.0021.0021.00
#0000008.9421.001.001.00
##0000008.9421.001.001.00

Color blindness preview

Protanopia (red-blind)
#9EB1E1
Deuteranopia (green-blind)
#8AA3DE
Tritanopia (blue-blind)
#00C0C2
Achromatopsia (no color)
#A9A9A9

Design tokens & code

CSS
--color: #51b4df;
/* rgb */ color: rgb(81, 180, 223);
/* oklch */ color: oklch(72.8% 0.111 229.6);
Tailwind
colors: {
  custom: {
    50: '#90cae9',
    500: '#51b4df',
    950: '#000000',
  },
}
SCSS
$custom: #51b4df;
$custom-light: #90cae9;
$custom-dark: #000000;
JSON
{
  "hex": "#51b4df",
  "rgb": {
    "r": 81,
    "g": 180,
    "b": 223
  },
  "hsl": {
    "h": 198.169,
    "s": 68.932,
    "l": 59.608
  },
  "oklch": {
    "l": 0.72832,
    "c": 0.11088,
    "h": 229.6
  },
  "luminance": 0.3972
}

Semantic roles & 50–950 ramp

primary
#51B4DF
secondary
#E1BBAA
accent
#713CEC
background
#F9FCFE
surface
#F2F8FC
border
#CCD1D5
text
#0E1316
muted
#7E8284

Preview Lab

Preview with #51B4DF

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

Preview Lab → · Contrast checker → · Palette generator →

#51B4DF Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva