#51B4E4#51B4E4

#51B4E4 is a light, moderate cyan. Relative luminance 0.400; OKLCH L 73.1% C 0.115 H 232.5°. Best body text is #000000 at 9.00:1 contrast (WCAG AA passes).

Color values

HEX	#51B4E4
RGB	rgb(81, 180, 228)
HSL	hsl(200, 73%, 61%)
HSV	hsv(200, 64%, 89%)
CMYK	cmyk(64.5%, 21.1%, 0%, 10.6%)
CIE-LAB	lab(69.46, -14.44, -32.61)
CIE-LCH	lch(69.46, 35.67, 246.12°)
OKLab	oklab(73.05% -0.0701 -0.0914)
OKLCH	oklch(73.05% 0.115 232.5)
XYZ	xyz(33.7127, 39.9898, 79.3258)
Luminance	0.3999 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B4E4 #E48151

analogous

#51E4CA #51B4E4 #516AE4

triadic

#51B4E4 #E451B4 #B4E451

tetradic

#51B4E4 #CA51E4 #E48151 #6AE451

square

#51B4E4 #CA51E4 #E48151 #6AE451

split-complementary

#51B4E4 #E4516A #E4CA51

monochromatic

#1975A2 #219BD7 #51B4E4 #86CBEC #BBE2F4

Accessibility & contrast

On white

2.33

#51B4E4 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.00

#51B4E4 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B4E4

9.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B4E4	#FFFFFF	#000000	##000000
##51B4E4	1.00	2.33	9.00	9.00
#FFFFFF	2.33	1.00	21.00	21.00
#000000	9.00	21.00	1.00	1.00
##000000	9.00	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9CB2E6

Deuteranopia (green-blind)

#88A3E3

Tritanopia (blue-blind)

#00C1C4

Achromatopsia (no color)

#AAAAAA

Design tokens & code

CSS

--color: #51b4e4;
/* rgb */ color: rgb(81, 180, 228);
/* oklch */ color: oklch(73.1% 0.115 232.5);

Tailwind

colors: {
  custom: {
    50: '#90caec',
    500: '#51b4e4',
    950: '#000000',
  },
}

SCSS

$custom: #51b4e4;
$custom-light: #90caec;
$custom-dark: #000000;

JSON

{
  "hex": "#51b4e4",
  "rgb": {
    "r": 81,
    "g": 180,
    "b": 228
  },
  "hsl": {
    "h": 199.592,
    "s": 73.134,
    "l": 60.588
  },
  "oklch": {
    "l": 0.73052,
    "c": 0.11519,
    "h": 232.5
  },
  "luminance": 0.39993
}

Semantic roles & 50–950 ramp

primary

#51B4E4

secondary

#E4BFAC

accent

#5110D5

background

#F9FCFE

surface

#F2F8FD

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B4E4

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

Preview Lab → · Contrast checker → · Palette generator →