#51B5DD#51B5DD

#51B5DD is a light, moderate cyan. Relative luminance 0.400; OKLCH L 73.0% C 0.109 H 227.5°. Best body text is #000000 at 9.00:1 contrast (WCAG AA passes).

Color values

HEX	#51B5DD
RGB	rgb(81, 181, 221)
HSL	hsl(197, 67%, 59%)
HSV	hsv(197, 63%, 87%)
CMYK	cmyk(63.3%, 18.1%, 0%, 13.3%)
CIE-LAB	lab(69.48, -17.16, -28.76)
CIE-LCH	lch(69.48, 33.49, 239.19°)
OKLab	oklab(72.98% -0.0736 -0.0803)
OKLCH	oklch(72.98% 0.109 227.5)
XYZ	xyz(32.9632, 40.0141, 74.3789)
Luminance	0.4002 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B5DD #DD7951

analogous

#51DDBF #51B5DD #516FDD

triadic

#51B5DD #DD51B5 #B5DD51

tetradic

#51B5DD #BF51DD #DD7951 #6FDD51

square

#51B5DD #BF51DD #DD7951 #6FDD51

split-complementary

#51B5DD #DD516F #DDBF51

monochromatic

#1D7496 #279BC9 #51B5DD #84CBE7 #B7E1F1

Accessibility & contrast

On white

2.33

#51B5DD on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.00

#51B5DD on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B5DD

9.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B5DD	#FFFFFF	#000000	##000000
##51B5DD	1.00	2.33	9.00	9.00
#FFFFFF	2.33	1.00	21.00	21.00
#000000	9.00	21.00	1.00	1.00
##000000	9.00	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A0B2DF

Deuteranopia (green-blind)

#8CA3DD

Tritanopia (blue-blind)

#00C1C2

Achromatopsia (no color)

#AAAAAA

Design tokens & code

CSS

--color: #51b5dd;
/* rgb */ color: rgb(81, 181, 221);
/* oklch */ color: oklch(73.0% 0.109 227.5);

Tailwind

colors: {
  custom: {
    50: '#8fcbe7',
    500: '#51b5dd',
    950: '#000000',
  },
}

SCSS

$custom: #51b5dd;
$custom-light: #8fcbe7;
$custom-dark: #000000;

JSON

{
  "hex": "#51b5dd",
  "rgb": {
    "r": 81,
    "g": 181,
    "b": 221
  },
  "hsl": {
    "h": 197.143,
    "s": 67.308,
    "l": 59.216
  },
  "oklch": {
    "l": 0.72976,
    "c": 0.10899,
    "h": 227.5
  },
  "luminance": 0.40018
}

Semantic roles & 50–950 ramp

primary

#51B5DD

secondary

#E0B9AA

accent

#6F3EEA

background

#F9FCFE

surface

#F2F8FC

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B5DD

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

Preview Lab → · Contrast checker → · Palette generator →