#51B7E4#51B7E4

#51B7E4 is a light, moderate cyan. Relative luminance 0.412; OKLCH L 73.7% C 0.114 H 230.1°. Best body text is #000000 at 9.24:1 contrast (WCAG AA passes).

Color values

HEX#51B7E4
RGBrgb(81, 183, 228)
HSLhsl(198, 73%, 61%)
HSVhsv(198, 64%, 89%)
CMYKcmyk(64.5%, 19.7%, 0%, 10.6%)
CIE-LABlab(70.33, -16.03, -31.28)
CIE-LCHlch(70.33, 35.15, 242.87°)
OKLaboklab(73.74% -0.0732 -0.0875)
OKLCHoklch(73.74% 0.114 230.1)
XYZxyz(34.3249, 41.2141, 79.5299)
Luminance0.4122 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#51B7E4 #E47E51
analogous
#51E4C7 #51B7E4 #516EE4
triadic
#51B7E4 #E451B7 #B7E451
tetradic
#51B7E4 #C751E4 #E47E51 #6EE451
square
#51B7E4 #C751E4 #E47E51 #6EE451
split-complementary
#51B7E4 #E4516E #E4C751
monochromatic
#1978A2 #219FD7 #51B7E4 #86CDEC #BBE3F4

Accessibility & contrast

On white

2.27
#51B7E4 on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

9.24
#51B7E4 on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B7E4
9.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##51B7E4#FFFFFF#000000##000000
##51B7E41.002.279.249.24
#FFFFFF2.271.0021.0021.00
#0000009.2421.001.001.00
##0000009.2421.001.001.00

Color blindness preview

Protanopia (red-blind)
#A0B4E6
Deuteranopia (green-blind)
#8CA5E3
Tritanopia (blue-blind)
#00C3C6
Achromatopsia (no color)
#ACACAC

Design tokens & code

CSS
--color: #51b7e4;
/* rgb */ color: rgb(81, 183, 228);
/* oklch */ color: oklch(73.7% 0.114 230.1);
Tailwind
colors: {
  custom: {
    50: '#90ccec',
    500: '#51b7e4',
    950: '#000000',
  },
}
SCSS
$custom: #51b7e4;
$custom-light: #90ccec;
$custom-dark: #000000;
JSON
{
  "hex": "#51b7e4",
  "rgb": {
    "r": 81,
    "g": 183,
    "b": 228
  },
  "hsl": {
    "h": 198.367,
    "s": 73.134,
    "l": 60.588
  },
  "oklch": {
    "l": 0.7374,
    "c": 0.1141,
    "h": 230.1
  },
  "luminance": 0.41218
}

Semantic roles & 50–950 ramp

primary
#51B7E4
secondary
#E4BEAC
accent
#4D10D5
background
#F9FCFE
surface
#F2F8FD
border
#CCD1D5
text
#0E1316
muted
#7E8284

Preview Lab

Preview with #51B7E4

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

Preview Lab → · Contrast checker → · Palette generator →

#51B7E4 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva