#51B9EA#51B9EA

#51B9EA is a light, moderate cyan. Relative luminance 0.424; OKLCH L 74.5% C 0.119 H 231.9°. Best body text is #000000 at 9.48:1 contrast (WCAG AA passes).

Color values

HEX	#51B9EA
RGB	rgb(81, 185, 234)
HSL	hsl(199, 78%, 62%)
HSV	hsv(199, 65%, 92%)
CMYK	cmyk(65.4%, 20.9%, 0%, 8.2%)
CIE-LAB	lab(71.13, -15.20, -33.29)
CIE-LCH	lch(71.13, 36.60, 245.45°)
OKLab	oklab(74.46% -0.0731 -0.0933)
OKLCH	oklch(74.46% 0.119 231.9)
XYZ	xyz(35.5877, 42.3840, 84.1314)
Luminance	0.4239 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B9EA #EA8251

analogous

#51EACF #51B9EA #516DEA

triadic

#51B9EA #EA51B9 #B9EA51

tetradic

#51B9EA #CF51EA #EA8251 #6DEA51

square

#51B9EA #CF51EA #EA8251 #6DEA51

split-complementary

#51B9EA #EA516D #EACF51

monochromatic

#157BAC #1BA3E2 #51B9EA #88CFF1 #BEE5F7

Accessibility & contrast

On white

2.22

#51B9EA on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.48

#51B9EA on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B9EA

9.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B9EA	#FFFFFF	#000000	##000000
##51B9EA	1.00	2.22	9.48	9.48
#FFFFFF	2.22	1.00	21.00	21.00
#000000	9.48	21.00	1.00	1.00
##000000	9.48	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A1B7EC

Deuteranopia (green-blind)

#8BA7E9

Tritanopia (blue-blind)

#00C6C9

Achromatopsia (no color)

#AEAEAE

Design tokens & code

CSS

--color: #51b9ea;
/* rgb */ color: rgb(81, 185, 234);
/* oklch */ color: oklch(74.5% 0.119 231.9);

Tailwind

colors: {
  custom: {
    50: '#91cef1',
    500: '#51b9ea',
    950: '#000000',
  },
}

SCSS

$custom: #51b9ea;
$custom-light: #91cef1;
$custom-dark: #000000;

JSON

{
  "hex": "#51b9ea",
  "rgb": {
    "r": 81,
    "g": 185,
    "b": 234
  },
  "hsl": {
    "h": 199.216,
    "s": 78.462,
    "l": 61.765
  },
  "oklch": {
    "l": 0.74463,
    "c": 0.11854,
    "h": 231.9
  },
  "luminance": 0.42388
}

Semantic roles & 50–950 ramp

primary

#51B9EA

secondary

#E8C1AF

accent

#4D0BDB

background

#F9FCFE

surface

#F2F9FD

border

#CCD2D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B9EA

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

Preview Lab → · Contrast checker → · Palette generator →