#51A9CD#51A9CD

#51A9CD is a light, moderate cyan. Relative luminance 0.345; OKLCH L 69.5% C 0.099 H 227.6°. Best body text is #000000 at 7.91:1 contrast (WCAG AA passes).

Color values

HEX#51A9CD
RGBrgb(81, 169, 205)
HSLhsl(197, 55%, 56%)
HSVhsv(197, 60%, 80%)
CMYKcmyk(60.5%, 17.6%, 0%, 19.6%)
CIE-LABlab(65.38, -15.74, -26.26)
CIE-LCHlch(65.38, 30.62, 239.06°)
OKLaboklab(69.51% -0.0669 -0.0732)
OKLCHoklch(69.51% 0.099 227.6)
XYZxyz(28.5965, 34.5302, 62.9037)
Luminance0.3453 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#51A9CD #CD7551
analogous
#51CDB3 #51A9CD #516BCD
triadic
#51A9CD #CD51A9 #A9CD51
tetradic
#51A9CD #B351CD #CD7551 #6BCD51
square
#51A9CD #B351CD #CD7551 #6BCD51
split-complementary
#51A9CD #CD516B #CDB351
monochromatic
#25657F #328AAF #51A9CD #81C0DB #B0D8E8

Accessibility & contrast

On white

2.66
#51A9CD on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

7.91
#51A9CD on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51A9CD
7.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##51A9CD#FFFFFF#000000##000000
##51A9CD1.002.667.917.91
#FFFFFF2.661.0021.0021.00
#0000007.9121.001.001.00
##0000007.9121.001.001.00

Color blindness preview

Protanopia (red-blind)
#96A6CF
Deuteranopia (green-blind)
#8499CD
Tritanopia (blue-blind)
#00B3B5
Achromatopsia (no color)
#9F9F9F

Design tokens & code

CSS
--color: #51a9cd;
/* rgb */ color: rgb(81, 169, 205);
/* oklch */ color: oklch(69.5% 0.099 227.6);
Tailwind
colors: {
  custom: {
    50: '#8dc2dc',
    500: '#51a9cd',
    950: '#000000',
  },
}
SCSS
$custom: #51a9cd;
$custom-light: #8dc2dc;
$custom-dark: #000000;
JSON
{
  "hex": "#51a9cd",
  "rgb": {
    "r": 81,
    "g": 169,
    "b": 205
  },
  "hsl": {
    "h": 197.419,
    "s": 55.357,
    "l": 56.078
  },
  "oklch": {
    "l": 0.69505,
    "c": 0.09917,
    "h": 227.6
  },
  "luminance": 0.34533
}

Semantic roles & 50–950 ramp

primary
#51A9CD
secondary
#D7B2A3
accent
#7549DF
background
#F9FBFD
surface
#F1F7FB
border
#CBD0D4
text
#0D1215
muted
#7E8183

Preview Lab

Preview with #51A9CD

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

Preview Lab → · Contrast checker → · Palette generator →

#51A9CD Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva