#51B4E3#51B4E3

#51B4E3 is a light, moderate cyan. Relative luminance 0.399; OKLCH L 73.0% C 0.114 H 231.9°. Best body text is #000000 at 8.99:1 contrast (WCAG AA passes).

Color values

HEX	#51B4E3
RGB	rgb(81, 180, 227)
HSL	hsl(199, 72%, 60%)
HSV	hsv(199, 64%, 89%)
CMYK	cmyk(64.3%, 20.7%, 0%, 11%)
CIE-LAB	lab(69.42, -14.75, -32.13)
CIE-LCH	lch(69.42, 35.35, 245.34°)
OKLab	oklab(73.01% -0.0705 -0.09)
OKLCH	oklch(73.01% 0.114 231.9)
XYZ	xyz(33.5743, 39.9344, 78.5969)
Luminance	0.3994 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B4E3 #E38051

analogous

#51E3C9 #51B4E3 #516BE3

triadic

#51B4E3 #E351B4 #B4E351

tetradic

#51B4E3 #C951E3 #E38051 #6BE351

square

#51B4E3 #C951E3 #E38051 #6BE351

split-complementary

#51B4E3 #E3516B #E3C951

monochromatic

#1A75A0 #229BD5 #51B4E3 #86CBEB #BAE1F4

Accessibility & contrast

On white

2.34

#51B4E3 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.99

#51B4E3 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B4E3

8.99:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B4E3	#FFFFFF	#000000	##000000
##51B4E3	1.00	2.34	8.99	8.99
#FFFFFF	2.34	1.00	21.00	21.00
#000000	8.99	21.00	1.00	1.00
##000000	8.99	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9DB2E5

Deuteranopia (green-blind)

#88A3E2

Tritanopia (blue-blind)

#00C1C4

Achromatopsia (no color)

#AAAAAA

Design tokens & code

CSS

--color: #51b4e3;
/* rgb */ color: rgb(81, 180, 227);
/* oklch */ color: oklch(73.0% 0.114 231.9);

Tailwind

colors: {
  custom: {
    50: '#90caec',
    500: '#51b4e3',
    950: '#000000',
  },
}

SCSS

$custom: #51b4e3;
$custom-light: #90caec;
$custom-dark: #000000;

JSON

{
  "hex": "#51b4e3",
  "rgb": {
    "r": 81,
    "g": 180,
    "b": 227
  },
  "hsl": {
    "h": 199.315,
    "s": 72.277,
    "l": 60.392
  },
  "oklch": {
    "l": 0.73008,
    "c": 0.1143,
    "h": 231.9
  },
  "luminance": 0.39938
}

Semantic roles & 50–950 ramp

primary

#51B4E3

secondary

#E4BEAC

accent

#5011D4

background

#F9FCFE

surface

#F2F8FD

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B4E3

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

Preview Lab → · Contrast checker → · Palette generator →