#51BDE4#51BDE4

#51BDE4 is a light, moderate cyan. Relative luminance 0.437; OKLCH L 75.1% C 0.113 H 225.2°. Best body text is #000000 at 9.75:1 contrast (WCAG AA passes).

Color values

HEX	#51BDE4
RGB	rgb(81, 189, 228)
HSL	hsl(196, 73%, 61%)
HSV	hsv(196, 64%, 89%)
CMYK	cmyk(64.5%, 17.1%, 0%, 10.6%)
CIE-LAB	lab(72.06, -19.17, -28.61)
CIE-LCH	lch(72.06, 34.44, 236.18°)
OKLab	oklab(75.12% -0.0793 -0.0799)
OKLCH	oklch(75.12% 0.113 225.2)
XYZ	xyz(35.5889, 43.7422, 79.9512)
Luminance	0.4375 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BDE4 #E47851

analogous

#51E4C1 #51BDE4 #5174E4

triadic

#51BDE4 #E451BD #BDE451

tetradic

#51BDE4 #C151E4 #E47851 #74E451

square

#51BDE4 #C151E4 #E47851 #74E451

split-complementary

#51BDE4 #E45174 #E4C151

monochromatic

#197DA2 #21A6D7 #51BDE4 #86D1EC #BBE5F4

Accessibility & contrast

On white

2.15

#51BDE4 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.75

#51BDE4 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BDE4

9.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BDE4	#FFFFFF	#000000	##000000
##51BDE4	1.00	2.15	9.75	9.75
#FFFFFF	2.15	1.00	21.00	21.00
#000000	9.75	21.00	1.00	1.00
##000000	9.75	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A8B9E6

Deuteranopia (green-blind)

#93AAE4

Tritanopia (blue-blind)

#00C9CA

Achromatopsia (no color)

#B1B1B1

Design tokens & code

CSS

--color: #51bde4;
/* rgb */ color: rgb(81, 189, 228);
/* oklch */ color: oklch(75.1% 0.113 225.2);

Tailwind

colors: {
  custom: {
    50: '#91d1ec',
    500: '#51bde4',
    950: '#000000',
  },
}

SCSS

$custom: #51bde4;
$custom-light: #91d1ec;
$custom-dark: #000000;

JSON

{
  "hex": "#51bde4",
  "rgb": {
    "r": 81,
    "g": 189,
    "b": 228
  },
  "hsl": {
    "h": 195.918,
    "s": 73.134,
    "l": 60.588
  },
  "oklch": {
    "l": 0.75122,
    "c": 0.11256,
    "h": 225.2
  },
  "luminance": 0.43746
}

Semantic roles & 50–950 ramp

primary

#51BDE4

secondary

#E4BBAC

accent

#4510D5

background

#F9FCFE

surface

#F2F9FD

border

#CCD2D5

text

#0E1416

muted

#7E8284

Preview Lab

Preview with #51BDE4

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

Preview Lab → · Contrast checker → · Palette generator →