#51C9F2#51C9F2

#51C9F2 is a light, vivid cyan. Relative luminance 0.499; OKLCH L 78.5% C 0.120 H 224.3°. Best body text is #000000 at 10.99:1 contrast (WCAG AA passes).

Color values

HEX#51C9F2
RGBrgb(81, 201, 242)
HSLhsl(195, 86%, 63%)
HSVhsv(195, 67%, 95%)
CMYKcmyk(66.5%, 16.9%, 0%, 5.1%)
CIE-LABlab(76.03, -21.03, -30.07)
CIE-LCHlch(76.03, 36.70, 235.03°)
OKLaboklab(78.47% -0.0862 -0.084)
OKLCHoklch(78.47% 0.12 224.3)
XYZxyz(40.3005, 49.9290, 91.5005)
Luminance0.4993 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#51C9F2 #F27A51
analogous
#51F2CB #51C9F2 #5178F2
triadic
#51C9F2 #F251C9 #C9F251
tetradic
#51C9F2 #CB51F2 #F27A51 #78F251
square
#51C9F2 #CB51F2 #F27A51 #78F251
split-complementary
#51C9F2 #F25178 #F2CB51
monochromatic
#0E8FBB #18B7EE #51C9F2 #8ADBF6 #C3ECFB

Accessibility & contrast

On white

1.91
#51C9F2 on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

10.99
#51C9F2 on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51C9F2
10.99:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##51C9F2#FFFFFF#000000##000000
##51C9F21.001.9110.9910.99
#FFFFFF1.911.0021.0021.00
#00000010.9921.001.001.00
##00000010.9921.001.001.00

Color blindness preview

Protanopia (red-blind)
#B2C5F4
Deuteranopia (green-blind)
#9CB4F2
Tritanopia (blue-blind)
#00D5D6
Achromatopsia (no color)
#BBBBBB

Design tokens & code

CSS
--color: #51c9f2;
/* rgb */ color: rgb(81, 201, 242);
/* oklch */ color: oklch(78.5% 0.120 224.3);
Tailwind
colors: {
  custom: {
    50: '#93d9f6',
    500: '#51c9f2',
    950: '#000000',
  },
}
SCSS
$custom: #51c9f2;
$custom-light: #93d9f6;
$custom-dark: #000000;
JSON
{
  "hex": "#51c9f2",
  "rgb": {
    "r": 81,
    "g": 201,
    "b": 242
  },
  "hsl": {
    "h": 195.28,
    "s": 86.096,
    "l": 63.333
  },
  "oklch": {
    "l": 0.78469,
    "c": 0.12037,
    "h": 224.3
  },
  "luminance": 0.49933
}

Semantic roles & 50–950 ramp

primary
#51C9F2
secondary
#ECC1B3
accent
#3C03E3
background
#F9FDFF
surface
#F2FAFE
border
#CCD3D6
text
#0E1417
muted
#7E8385

Preview Lab

Preview with #51C9F2

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

Preview Lab → · Contrast checker → · Palette generator →

#51C9F2 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva