#51B9F2#51B9F2

#51B9F2 is a light, vivid cyan. Relative luminance 0.429; OKLCH L 74.8% C 0.126 H 236.0°. Best body text is #000000 at 9.57:1 contrast (WCAG AA passes).

Color values

HEX#51B9F2
RGBrgb(81, 185, 242)
HSLhsl(201, 86%, 63%)
HSVhsv(201, 67%, 95%)
CMYKcmyk(66.5%, 23.6%, 0%, 5.1%)
CIE-LABlab(71.46, -12.66, -37.13)
CIE-LCHlch(71.46, 39.23, 251.17°)
OKLaboklab(74.82% -0.0704 -0.1043)
OKLCHoklch(74.82% 0.126 236)
XYZxyz(36.7631, 42.8541, 90.3214)
Luminance0.4286 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#51B9F2 #F28A51
analogous
#51F2DA #51B9F2 #5168F2
triadic
#51B9F2 #F251B9 #B9F251
tetradic
#51B9F2 #DA51F2 #F28A51 #68F251
square
#51B9F2 #DA51F2 #F28A51 #68F251
split-complementary
#51B9F2 #F25168 #F2DA51
monochromatic
#0E7EBB #18A2EE #51B9F2 #8AD0F6 #C3E7FB

Accessibility & contrast

On white

2.19
#51B9F2 on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

9.57
#51B9F2 on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B9F2
9.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##51B9F2#FFFFFF#000000##000000
##51B9F21.002.199.579.57
#FFFFFF2.191.0021.0021.00
#0000009.5721.001.001.00
##0000009.5721.001.001.00

Color blindness preview

Protanopia (red-blind)
#9EB8F5
Deuteranopia (green-blind)
#88A8F1
Tritanopia (blue-blind)
#00C8CC
Achromatopsia (no color)
#AFAFAF

Design tokens & code

CSS
--color: #51b9f2;
/* rgb */ color: rgb(81, 185, 242);
/* oklch */ color: oklch(74.8% 0.126 236.0);
Tailwind
colors: {
  custom: {
    50: '#92cef6',
    500: '#51b9f2',
    950: '#000000',
  },
}
SCSS
$custom: #51b9f2;
$custom-light: #92cef6;
$custom-dark: #000000;
JSON
{
  "hex": "#51b9f2",
  "rgb": {
    "r": 81,
    "g": 185,
    "b": 242
  },
  "hsl": {
    "h": 201.242,
    "s": 86.096,
    "l": 63.333
  },
  "oklch": {
    "l": 0.74824,
    "c": 0.12588,
    "h": 236
  },
  "luminance": 0.42858
}

Semantic roles & 50–950 ramp

primary
#51B9F2
secondary
#ECC7B3
accent
#5203E3
background
#F9FCFF
surface
#F2F9FE
border
#CCD2D6
text
#0E1317
muted
#7E8285

Preview Lab

Preview with #51B9F2

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

Preview Lab → · Contrast checker → · Palette generator →

#51B9F2 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva