#51B1EA#51B1EA

#51B1EA is a light, vivid cyan. Relative luminance 0.391; OKLCH L 72.6% C 0.122 H 237.8°. Best body text is #000000 at 8.83:1 contrast (WCAG AA passes).

Color values

HEX	#51B1EA
RGB	rgb(81, 177, 234)
HSL	hsl(202, 78%, 62%)
HSV	hsv(202, 65%, 92%)
CMYK	cmyk(65.4%, 24.4%, 0%, 8.2%)
CIE-LAB	lab(68.85, -10.91, -36.84)
CIE-LCH	lch(68.85, 38.43, 253.50°)
OKLab	oklab(72.64% -0.0651 -0.1036)
OKLCH	oklch(72.64% 0.122 237.8)
XYZ	xyz(33.9610, 39.1306, 83.5891)
Luminance	0.3913 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B1EA #EA8A51

analogous

#51EAD7 #51B1EA #5165EA

triadic

#51B1EA #EA51B1 #B1EA51

tetradic

#51B1EA #D751EA #EA8A51 #65EA51

square

#51B1EA #D751EA #EA8A51 #65EA51

split-complementary

#51B1EA #EA5165 #EAD751

monochromatic

#1574AC #1B98E2 #51B1EA #88C9F1 #BEE2F7

Accessibility & contrast

On white

2.38

#51B1EA on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.83

#51B1EA on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B1EA

8.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B1EA	#FFFFFF	#000000	##000000
##51B1EA	1.00	2.38	8.83	8.83
#FFFFFF	2.38	1.00	21.00	21.00
#000000	8.83	21.00	1.00	1.00
##000000	8.83	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#96B0ED

Deuteranopia (green-blind)

#81A1E9

Tritanopia (blue-blind)

#00C0C4

Achromatopsia (no color)

#A8A8A8

Design tokens & code

CSS

--color: #51b1ea;
/* rgb */ color: rgb(81, 177, 234);
/* oklch */ color: oklch(72.6% 0.122 237.8);

Tailwind

colors: {
  custom: {
    50: '#91c8f1',
    500: '#51b1ea',
    950: '#000000',
  },
}

SCSS

$custom: #51b1ea;
$custom-light: #91c8f1;
$custom-dark: #000000;

JSON

{
  "hex": "#51b1ea",
  "rgb": {
    "r": 81,
    "g": 177,
    "b": 234
  },
  "hsl": {
    "h": 202.353,
    "s": 78.462,
    "l": 61.765
  },
  "oklch": {
    "l": 0.72643,
    "c": 0.12232,
    "h": 237.8
  },
  "luminance": 0.39134
}

Semantic roles & 50–950 ramp

primary

#51B1EA

secondary

#E8C4AF

accent

#580BDB

background

#F9FCFE

surface

#F2F8FD

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B1EA

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

Preview Lab → · Contrast checker → · Palette generator →