#51B1DC#51B1DC

#51B1DC is a light, moderate cyan. Relative luminance 0.384; OKLCH L 72.0% C 0.109 H 230.3°. Best body text is #000000 at 8.67:1 contrast (WCAG AA passes).

Color values

HEX#51B1DC
RGBrgb(81, 177, 220)
HSLhsl(199, 67%, 59%)
HSVhsv(199, 63%, 86%)
CMYKcmyk(63.2%, 19.5%, 0%, 13.7%)
CIE-LABlab(68.28, -15.35, -30.06)
CIE-LCHlch(68.28, 33.75, 242.95°)
OKLaboklab(72.01% -0.0699 -0.0841)
OKLCHoklch(72.01% 0.109 230.3)
XYZxyz(32.0287, 38.3576, 73.4121)
Luminance0.3836 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#51B1DC #DC7C51
analogous
#51DCC2 #51B1DC #516CDC
triadic
#51B1DC #DC51B1 #B1DC51
tetradic
#51B1DC #C251DC #DC7C51 #6CDC51
square
#51B1DC #C251DC #DC7C51 #6CDC51
split-complementary
#51B1DC #DC516C #DCC251
monochromatic
#1E7095 #2896C8 #51B1DC #84C8E6 #B7DFF0

Accessibility & contrast

On white

2.42
#51B1DC on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

8.67
#51B1DC on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B1DC
8.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##51B1DC#FFFFFF#000000##000000
##51B1DC1.002.428.678.67
#FFFFFF2.421.0021.0021.00
#0000008.6721.001.001.00
##0000008.6721.001.001.00

Color blindness preview

Protanopia (red-blind)
#9BAFDE
Deuteranopia (green-blind)
#88A0DB
Tritanopia (blue-blind)
#00BDBF
Achromatopsia (no color)
#A6A6A6

Design tokens & code

CSS
--color: #51b1dc;
/* rgb */ color: rgb(81, 177, 220);
/* oklch */ color: oklch(72.0% 0.109 230.3);
Tailwind
colors: {
  custom: {
    50: '#8fc8e7',
    500: '#51b1dc',
    950: '#000000',
  },
}
SCSS
$custom: #51b1dc;
$custom-light: #8fc8e7;
$custom-dark: #000000;
JSON
{
  "hex": "#51b1dc",
  "rgb": {
    "r": 81,
    "g": 177,
    "b": 220
  },
  "hsl": {
    "h": 198.561,
    "s": 66.507,
    "l": 59.02
  },
  "oklch": {
    "l": 0.7201,
    "c": 0.10931,
    "h": 230.3
  },
  "luminance": 0.38361
}

Semantic roles & 50–950 ramp

primary
#51B1DC
secondary
#E0BAA9
accent
#733EE9
background
#F9FCFE
surface
#F2F8FC
border
#CCD1D5
text
#0E1316
muted
#7E8284

Preview Lab

Preview with #51B1DC

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

Preview Lab → · Contrast checker → · Palette generator →

#51B1DC Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva