#51B8DF#51B8DF

#51B8DF is a light, moderate cyan. Relative luminance 0.414; OKLCH L 73.8% C 0.110 H 226.2°. Best body text is #000000 at 9.27:1 contrast (WCAG AA passes).

Color values

HEX	#51B8DF
RGB	rgb(81, 184, 223)
HSL	hsl(196, 69%, 60%)
HSV	hsv(196, 64%, 87%)
CMYK	cmyk(63.7%, 17.5%, 0%, 12.5%)
CIE-LAB	lab(70.42, -18.11, -28.40)
CIE-LCH	lch(70.42, 33.68, 237.48°)
OKLab	oklab(73.76% -0.076 -0.0793)
OKLCH	oklch(73.76% 0.11 226.2)
XYZ	xyz(33.8478, 41.3545, 75.9961)
Luminance	0.4136 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B8DF #DF7851

analogous

#51DFBF #51B8DF #5171DF

triadic

#51B8DF #DF51B8 #B8DF51

tetradic

#51B8DF #BF51DF #DF7851 #71DF51

square

#51B8DF #BF51DF #DF7851 #71DF51

split-complementary

#51B8DF #DF5171 #DFBF51

monochromatic

#1C7799 #269FCD #51B8DF #85CDE9 #B8E2F2

Accessibility & contrast

On white

2.26

#51B8DF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.27

#51B8DF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B8DF

9.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B8DF	#FFFFFF	#000000	##000000
##51B8DF	1.00	2.26	9.27	9.27
#FFFFFF	2.26	1.00	21.00	21.00
#000000	9.27	21.00	1.00	1.00
##000000	9.27	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A3B5E1

Deuteranopia (green-blind)

#8FA6DF

Tritanopia (blue-blind)

#00C3C5

Achromatopsia (no color)

#ACACAC

Design tokens & code

CSS

--color: #51b8df;
/* rgb */ color: rgb(81, 184, 223);
/* oklch */ color: oklch(73.8% 0.110 226.2);

Tailwind

colors: {
  custom: {
    50: '#90cde9',
    500: '#51b8df',
    950: '#000000',
  },
}

SCSS

$custom: #51b8df;
$custom-light: #90cde9;
$custom-dark: #000000;

JSON

{
  "hex": "#51b8df",
  "rgb": {
    "r": 81,
    "g": 184,
    "b": 223
  },
  "hsl": {
    "h": 196.479,
    "s": 68.932,
    "l": 59.608
  },
  "oklch": {
    "l": 0.73755,
    "c": 0.10985,
    "h": 226.2
  },
  "luminance": 0.41358
}

Semantic roles & 50–950 ramp

primary

#51B8DF

secondary

#E1B9AA

accent

#6C3CEC

background

#F9FCFE

surface

#F2F9FC

border

#CCD2D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B8DF

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

Preview Lab → · Contrast checker → · Palette generator →