#51C9EE#51C9EE

#51C9EE is a light, moderate cyan. Relative luminance 0.497; OKLCH L 78.3% C 0.118 H 221.9°. Best body text is #000000 at 10.94:1 contrast (WCAG AA passes).

Color values

HEX	#51C9EE
RGB	rgb(81, 201, 238)
HSL	hsl(194, 82%, 63%)
HSV	hsv(194, 66%, 93%)
CMYK	cmyk(66%, 15.5%, 0%, 6.7%)
CIE-LAB	lab(75.88, -22.26, -28.14)
CIE-LCH	lch(75.88, 35.88, 231.66°)
OKLab	oklab(78.3% -0.0877 -0.0785)
OKLCH	oklch(78.3% 0.118 221.9)
XYZ	xyz(39.7063, 49.6913, 88.3711)
Luminance	0.4970 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51C9EE #EE7651

analogous

#51EEC4 #51C9EE #517BEE

triadic

#51C9EE #EE51C9 #C9EE51

tetradic

#51C9EE #C451EE #EE7651 #7BEE51

square

#51C9EE #C451EE #EE7651 #7BEE51

split-complementary

#51C9EE #EE517B #EEC451

monochromatic

#118DB3 #19B8E9 #51C9EE #89DAF3 #C1ECF9

Accessibility & contrast

On white

1.92

#51C9EE on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

10.94

#51C9EE on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51C9EE

10.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51C9EE	#FFFFFF	#000000	##000000
##51C9EE	1.00	1.92	10.94	10.94
#FFFFFF	1.92	1.00	21.00	21.00
#000000	10.94	21.00	1.00	1.00
##000000	10.94	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#B3C4F0

Deuteranopia (green-blind)

#9DB4EE

Tritanopia (blue-blind)

#00D5D5

Achromatopsia (no color)

#BBBBBB

Design tokens & code

CSS

--color: #51c9ee;
/* rgb */ color: rgb(81, 201, 238);
/* oklch */ color: oklch(78.3% 0.118 221.9);

Tailwind

colors: {
  custom: {
    50: '#93d9f3',
    500: '#51c9ee',
    950: '#000000',
  },
}

SCSS

$custom: #51c9ee;
$custom-light: #93d9f3;
$custom-dark: #000000;

JSON

{
  "hex": "#51c9ee",
  "rgb": {
    "r": 81,
    "g": 201,
    "b": 238
  },
  "hsl": {
    "h": 194.14,
    "s": 82.199,
    "l": 62.549
  },
  "oklch": {
    "l": 0.78304,
    "c": 0.1177,
    "h": 221.9
  },
  "luminance": 0.49696
}

Semantic roles & 50–950 ramp

primary

#51C9EE

secondary

#EABEB1

accent

#3A07DF

background

#F9FDFE

surface

#F2FAFD

border

#CCD3D5

text

#0E1417

muted

#7E8385

Preview Lab

Preview with #51C9EE

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

Preview Lab → · Contrast checker → · Palette generator →