#51B8EB#51B8EB

#51B8EB is a light, moderate cyan. Relative luminance 0.420; OKLCH L 74.3% C 0.120 H 233.2°. Best body text is #000000 at 9.41:1 contrast (WCAG AA passes).

Color values

HEX	#51B8EB
RGB	rgb(81, 184, 235)
HSL	hsl(200, 79%, 62%)
HSV	hsv(200, 66%, 92%)
CMYK	cmyk(65.5%, 21.7%, 0%, 7.8%)
CIE-LAB	lab(70.89, -14.36, -34.22)
CIE-LCH	lch(70.89, 37.11, 247.24°)
OKLab	oklab(74.28% -0.0718 -0.096)
OKLCH	oklch(74.28% 0.12 233.2)
XYZ	xyz(35.5234, 42.0247, 84.8206)
Luminance	0.4203 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B8EB #EB8451

analogous

#51EBD1 #51B8EB #516BEB

triadic

#51B8EB #EB51B8 #B8EB51

tetradic

#51B8EB #D151EB #EB8451 #6BEB51

square

#51B8EB #D151EB #EB8451 #6BEB51

split-complementary

#51B8EB #EB516B #EBD151

monochromatic

#147BAE #1AA2E5 #51B8EB #88CEF1 #BFE5F8

Accessibility & contrast

On white

2.23

#51B8EB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.41

#51B8EB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B8EB

9.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B8EB	#FFFFFF	#000000	##000000
##51B8EB	1.00	2.23	9.41	9.41
#FFFFFF	2.23	1.00	21.00	21.00
#000000	9.41	21.00	1.00	1.00
##000000	9.41	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9FB6ED

Deuteranopia (green-blind)

#8AA7EA

Tritanopia (blue-blind)

#00C6C9

Achromatopsia (no color)

#ADADAD

Design tokens & code

CSS

--color: #51b8eb;
/* rgb */ color: rgb(81, 184, 235);
/* oklch */ color: oklch(74.3% 0.120 233.2);

Tailwind

colors: {
  custom: {
    50: '#91cdf1',
    500: '#51b8eb',
    950: '#000000',
  },
}

SCSS

$custom: #51b8eb;
$custom-light: #91cdf1;
$custom-dark: #000000;

JSON

{
  "hex": "#51b8eb",
  "rgb": {
    "r": 81,
    "g": 184,
    "b": 235
  },
  "hsl": {
    "h": 199.87,
    "s": 79.381,
    "l": 61.961
  },
  "oklch": {
    "l": 0.74279,
    "c": 0.11983,
    "h": 233.2
  },
  "luminance": 0.42028
}

Semantic roles & 50–950 ramp

primary

#51B8EB

secondary

#E8C2B0

accent

#4F0ADC

background

#F9FCFE

surface

#F2F9FD

border

#CCD2D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B8EB

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

Preview Lab → · Contrast checker → · Palette generator →