#51C5EB#51C5EB

#51C5EB is a light, moderate cyan. Relative luminance 0.477; OKLCH L 77.3% C 0.116 H 223.1°. Best body text is #000000 at 10.54:1 contrast (WCAG AA passes).

Color values

HEX	#51C5EB
RGB	rgb(81, 197, 235)
HSL	hsl(195, 79%, 62%)
HSV	hsv(195, 66%, 92%)
CMYK	cmyk(65.5%, 16.2%, 0%, 7.8%)
CIE-LAB	lab(74.62, -21.14, -28.46)
CIE-LCH	lch(74.62, 35.45, 233.40°)
OKLab	oklab(77.26% -0.0848 -0.0794)
OKLCH	oklch(77.26% 0.116 223.1)
XYZ	xyz(38.3489, 47.6758, 85.7625)
Luminance	0.4768 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51C5EB #EB7751

analogous

#51EBC4 #51C5EB #5178EB

triadic

#51C5EB #EB51C5 #C5EB51

tetradic

#51C5EB #C451EB #EB7751 #78EB51

square

#51C5EB #C451EB #EB7751 #78EB51

split-complementary

#51C5EB #EB5178 #EBC451

monochromatic

#1488AE #1AB3E5 #51C5EB #88D7F1 #BFEAF8

Accessibility & contrast

On white

1.99

#51C5EB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

10.54

#51C5EB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51C5EB

10.54:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51C5EB	#FFFFFF	#000000	##000000
##51C5EB	1.00	1.99	10.54	10.54
#FFFFFF	1.99	1.00	21.00	21.00
#000000	10.54	21.00	1.00	1.00
##000000	10.54	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#AFC1ED

Deuteranopia (green-blind)

#9AB1EB

Tritanopia (blue-blind)

#00D1D1

Achromatopsia (no color)

#B8B8B8

Design tokens & code

CSS

--color: #51c5eb;
/* rgb */ color: rgb(81, 197, 235);
/* oklch */ color: oklch(77.3% 0.116 223.1);

Tailwind

colors: {
  custom: {
    50: '#92d6f1',
    500: '#51c5eb',
    950: '#000000',
  },
}

SCSS

$custom: #51c5eb;
$custom-light: #92d6f1;
$custom-dark: #000000;

JSON

{
  "hex": "#51c5eb",
  "rgb": {
    "r": 81,
    "g": 197,
    "b": 235
  },
  "hsl": {
    "h": 194.805,
    "s": 79.381,
    "l": 61.961
  },
  "oklch": {
    "l": 0.77259,
    "c": 0.11619,
    "h": 223.1
  },
  "luminance": 0.4768
}

Semantic roles & 50–950 ramp

primary

#51C5EB

secondary

#E8BEB0

accent

#3E0ADC

background

#F9FDFE

surface

#F2FAFD

border

#CCD3D5

text

#0E1416

muted

#7E8384

Preview Lab

Preview with #51C5EB

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

Preview Lab → · Contrast checker → · Palette generator →