#51B5EB#51B5EB

#51B5EB is a light, vivid cyan. Relative luminance 0.408; OKLCH L 73.6% C 0.121 H 235.4°. Best body text is #000000 at 9.16:1 contrast (WCAG AA passes).

Color values

HEX	#51B5EB
RGB	rgb(81, 181, 235)
HSL	hsl(201, 79%, 62%)
HSV	hsv(201, 66%, 92%)
CMYK	cmyk(65.5%, 23%, 0%, 7.8%)
CIE-LAB	lab(70.03, -12.75, -35.55)
CIE-LCH	lch(70.03, 37.77, 250.26°)
OKLab	oklab(73.6% -0.0688 -0.0998)
OKLCH	oklch(73.6% 0.121 235.4)
XYZ	xyz(34.9068, 40.7916, 84.6151)
Luminance	0.4079 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B5EB #EB8751

analogous

#51EBD4 #51B5EB #5168EB

triadic

#51B5EB #EB51B5 #B5EB51

tetradic

#51B5EB #D451EB #EB8751 #68EB51

square

#51B5EB #D451EB #EB8751 #68EB51

split-complementary

#51B5EB #EB5168 #EBD451

monochromatic

#1478AE #1A9EE5 #51B5EB #88CCF1 #BFE4F8

Accessibility & contrast

On white

2.29

#51B5EB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.16

#51B5EB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B5EB

9.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B5EB	#FFFFFF	#000000	##000000
##51B5EB	1.00	2.29	9.16	9.16
#FFFFFF	2.29	1.00	21.00	21.00
#000000	9.16	21.00	1.00	1.00
##000000	9.16	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9BB4EE

Deuteranopia (green-blind)

#86A4EA

Tritanopia (blue-blind)

#00C3C7

Achromatopsia (no color)

#ABABAB

Design tokens & code

CSS

--color: #51b5eb;
/* rgb */ color: rgb(81, 181, 235);
/* oklch */ color: oklch(73.6% 0.121 235.4);

Tailwind

colors: {
  custom: {
    50: '#91cbf1',
    500: '#51b5eb',
    950: '#000000',
  },
}

SCSS

$custom: #51b5eb;
$custom-light: #91cbf1;
$custom-dark: #000000;

JSON

{
  "hex": "#51b5eb",
  "rgb": {
    "r": 81,
    "g": 181,
    "b": 235
  },
  "hsl": {
    "h": 201.039,
    "s": 79.381,
    "l": 61.961
  },
  "oklch": {
    "l": 0.73596,
    "c": 0.12121,
    "h": 235.4
  },
  "luminance": 0.40795
}

Semantic roles & 50–950 ramp

primary

#51B5EB

secondary

#E8C3B0

accent

#530ADC

background

#F9FCFE

surface

#F2F8FD

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B5EB

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

Preview Lab → · Contrast checker → · Palette generator →