#51B8EA#51B8EA

#51B8EA is a light, moderate cyan. Relative luminance 0.420; OKLCH L 74.2% C 0.119 H 232.7°. Best body text is #000000 at 9.39:1 contrast (WCAG AA passes).

Color values

HEX	#51B8EA
RGB	rgb(81, 184, 234)
HSL	hsl(200, 78%, 62%)
HSV	hsv(200, 65%, 92%)
CMYK	cmyk(65.4%, 21.4%, 0%, 8.2%)
CIE-LAB	lab(70.85, -14.67, -33.74)
CIE-LCH	lch(70.85, 36.79, 246.49°)
OKLab	oklab(74.23% -0.0721 -0.0946)
OKLCH	oklch(74.23% 0.119 232.7)
XYZ	xyz(35.3793, 41.9671, 84.0619)
Luminance	0.4197 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B8EA #EA8351

analogous

#51EAD0 #51B8EA #516CEA

triadic

#51B8EA #EA51B8 #B8EA51

tetradic

#51B8EA #D051EA #EA8351 #6CEA51

square

#51B8EA #D051EA #EA8351 #6CEA51

split-complementary

#51B8EA #EA516C #EAD051

monochromatic

#157AAC #1BA1E2 #51B8EA #88CEF1 #BEE5F7

Accessibility & contrast

On white

2.24

#51B8EA on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.39

#51B8EA on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B8EA

9.39:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B8EA	#FFFFFF	#000000	##000000
##51B8EA	1.00	2.24	9.39	9.39
#FFFFFF	2.24	1.00	21.00	21.00
#000000	9.39	21.00	1.00	1.00
##000000	9.39	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9FB6EC

Deuteranopia (green-blind)

#8AA7E9

Tritanopia (blue-blind)

#00C5C9

Achromatopsia (no color)

#ADADAD

Design tokens & code

CSS

--color: #51b8ea;
/* rgb */ color: rgb(81, 184, 234);
/* oklch */ color: oklch(74.2% 0.119 232.7);

Tailwind

colors: {
  custom: {
    50: '#91cdf1',
    500: '#51b8ea',
    950: '#000000',
  },
}

SCSS

$custom: #51b8ea;
$custom-light: #91cdf1;
$custom-dark: #000000;

JSON

{
  "hex": "#51b8ea",
  "rgb": {
    "r": 81,
    "g": 184,
    "b": 234
  },
  "hsl": {
    "h": 199.608,
    "s": 78.462,
    "l": 61.765
  },
  "oklch": {
    "l": 0.74234,
    "c": 0.11893,
    "h": 232.7
  },
  "luminance": 0.41971
}

Semantic roles & 50–950 ramp

primary

#51B8EA

secondary

#E8C2AF

accent

#4F0BDB

background

#F9FCFE

surface

#F2F9FD

border

#CCD2D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B8EA

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

Preview Lab → · Contrast checker → · Palette generator →