#51B5EA#51B5EA

#51B5EA is a light, vivid cyan. Relative luminance 0.407; OKLCH L 73.6% C 0.120 H 234.9°. Best body text is #000000 at 9.15:1 contrast (WCAG AA passes).

Color values

HEX	#51B5EA
RGB	rgb(81, 181, 234)
HSL	hsl(201, 78%, 62%)
HSV	hsv(201, 65%, 92%)
CMYK	cmyk(65.4%, 22.6%, 0%, 8.2%)
CIE-LAB	lab(69.99, -13.07, -35.07)
CIE-LCH	lch(69.99, 37.43, 249.56°)
OKLab	oklab(73.55% -0.0691 -0.0984)
OKLCH	oklch(73.55% 0.12 234.9)
XYZ	xyz(34.7627, 40.7339, 83.8563)
Luminance	0.4074 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B5EA #EA8651

analogous

#51EAD2 #51B5EA #5169EA

triadic

#51B5EA #EA51B5 #B5EA51

tetradic

#51B5EA #D251EA #EA8651 #69EA51

square

#51B5EA #D251EA #EA8651 #69EA51

split-complementary

#51B5EA #EA5169 #EAD251

monochromatic

#1578AC #1B9DE2 #51B5EA #88CCF1 #BEE3F7

Accessibility & contrast

On white

2.30

#51B5EA on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.15

#51B5EA on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B5EA

9.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B5EA	#FFFFFF	#000000	##000000
##51B5EA	1.00	2.30	9.15	9.15
#FFFFFF	2.30	1.00	21.00	21.00
#000000	9.15	21.00	1.00	1.00
##000000	9.15	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9CB4ED

Deuteranopia (green-blind)

#87A4E9

Tritanopia (blue-blind)

#00C3C7

Achromatopsia (no color)

#ABABAB

Design tokens & code

CSS

--color: #51b5ea;
/* rgb */ color: rgb(81, 181, 234);
/* oklch */ color: oklch(73.6% 0.120 234.9);

Tailwind

colors: {
  custom: {
    50: '#91cbf1',
    500: '#51b5ea',
    950: '#000000',
  },
}

SCSS

$custom: #51b5ea;
$custom-light: #91cbf1;
$custom-dark: #000000;

JSON

{
  "hex": "#51b5ea",
  "rgb": {
    "r": 81,
    "g": 181,
    "b": 234
  },
  "hsl": {
    "h": 200.784,
    "s": 78.462,
    "l": 61.765
  },
  "oklch": {
    "l": 0.73551,
    "c": 0.12026,
    "h": 234.9
  },
  "luminance": 0.40738
}

Semantic roles & 50–950 ramp

primary

#51B5EA

secondary

#E8C3AF

accent

#530BDB

background

#F9FCFE

surface

#F2F8FD

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B5EA

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

Preview Lab → · Contrast checker → · Palette generator →