#51B3DD#51B3DD

#51B3DD is a light, moderate cyan. Relative luminance 0.392; OKLCH L 72.5% C 0.110 H 229.2°. Best body text is #000000 at 8.84:1 contrast (WCAG AA passes).

Color values

HEX	#51B3DD
RGB	rgb(81, 179, 221)
HSL	hsl(198, 67%, 59%)
HSV	hsv(198, 63%, 87%)
CMYK	cmyk(63.3%, 19%, 0%, 13.3%)
CIE-LAB	lab(68.90, -16.10, -29.65)
CIE-LCH	lch(68.90, 33.74, 241.50°)
OKLab	oklab(72.52% -0.0716 -0.0829)
OKLCH	oklch(72.52% 0.11 229.2)
XYZ	xyz(32.5595, 39.2066, 74.2443)
Luminance	0.3921 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B3DD #DD7B51

analogous

#51DDC1 #51B3DD #516DDD

triadic

#51B3DD #DD51B3 #B3DD51

tetradic

#51B3DD #C151DD #DD7B51 #6DDD51

square

#51B3DD #C151DD #DD7B51 #6DDD51

split-complementary

#51B3DD #DD516D #DDC151

monochromatic

#1D7296 #2799C9 #51B3DD #84C9E7 #B7E0F1

Accessibility & contrast

On white

2.38

#51B3DD on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.84

#51B3DD on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B3DD

8.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B3DD	#FFFFFF	#000000	##000000
##51B3DD	1.00	2.38	8.84	8.84
#FFFFFF	2.38	1.00	21.00	21.00
#000000	8.84	21.00	1.00	1.00
##000000	8.84	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9DB0DF

Deuteranopia (green-blind)

#8AA2DC

Tritanopia (blue-blind)

#00BFC1

Achromatopsia (no color)

#A8A8A8

Design tokens & code

CSS

--color: #51b3dd;
/* rgb */ color: rgb(81, 179, 221);
/* oklch */ color: oklch(72.5% 0.110 229.2);

Tailwind

colors: {
  custom: {
    50: '#8fc9e7',
    500: '#51b3dd',
    950: '#000000',
  },
}

SCSS

$custom: #51b3dd;
$custom-light: #8fc9e7;
$custom-dark: #000000;

JSON

{
  "hex": "#51b3dd",
  "rgb": {
    "r": 81,
    "g": 179,
    "b": 221
  },
  "hsl": {
    "h": 198,
    "s": 67.308,
    "l": 59.216
  },
  "oklch": {
    "l": 0.72515,
    "c": 0.10953,
    "h": 229.2
  },
  "luminance": 0.3921
}

Semantic roles & 50–950 ramp

primary

#51B3DD

secondary

#E0BAAA

accent

#713EEA

background

#F9FCFE

surface

#F2F8FC

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B3DD

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

Preview Lab → · Contrast checker → · Palette generator →