#51BEE9#51BEE9

#51BEE9 is a light, moderate cyan. Relative luminance 0.445; OKLCH L 75.6% C 0.116 H 227.5°. Best body text is #000000 at 9.89:1 contrast (WCAG AA passes).

Color values

HEX	#51BEE9
RGB	rgb(81, 190, 233)
HSL	hsl(197, 78%, 62%)
HSV	hsv(197, 65%, 91%)
CMYK	cmyk(65.2%, 18.5%, 0%, 8.6%)
CIE-LAB	lab(72.53, -18.14, -30.59)
CIE-LCH	lch(72.53, 35.57, 239.33°)
OKLab	oklab(75.56% -0.0785 -0.0855)
OKLCH	oklch(75.56% 0.116 227.5)
XYZ	xyz(36.5089, 44.4555, 83.7317)
Luminance	0.4446 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BEE9 #E97C51

analogous

#51E9C8 #51BEE9 #5172E9

triadic

#51BEE9 #E951BE #BEE951

tetradic

#51BEE9 #C851E9 #E97C51 #72E951

square

#51BEE9 #C851E9 #E97C51 #72E951

split-complementary

#51BEE9 #E95172 #E9C851

monochromatic

#1680AA #1CA9E0 #51BEE9 #87D2F0 #BEE7F7

Accessibility & contrast

On white

2.12

#51BEE9 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.89

#51BEE9 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BEE9

9.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BEE9	#FFFFFF	#000000	##000000
##51BEE9	1.00	2.12	9.89	9.89
#FFFFFF	2.12	1.00	21.00	21.00
#000000	9.89	21.00	1.00	1.00
##000000	9.89	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A7BBEB

Deuteranopia (green-blind)

#92ABE8

Tritanopia (blue-blind)

#00CACC

Achromatopsia (no color)

#B2B2B2

Design tokens & code

CSS

--color: #51bee9;
/* rgb */ color: rgb(81, 190, 233);
/* oklch */ color: oklch(75.6% 0.116 227.5);

Tailwind

colors: {
  custom: {
    50: '#91d1f0',
    500: '#51bee9',
    950: '#000000',
  },
}

SCSS

$custom: #51bee9;
$custom-light: #91d1f0;
$custom-dark: #000000;

JSON

{
  "hex": "#51bee9",
  "rgb": {
    "r": 81,
    "g": 190,
    "b": 233
  },
  "hsl": {
    "h": 196.974,
    "s": 77.551,
    "l": 61.569
  },
  "oklch": {
    "l": 0.75564,
    "c": 0.11609,
    "h": 227.5
  },
  "luminance": 0.44459
}

Semantic roles & 50–950 ramp

primary

#51BEE9

secondary

#E7BFAF

accent

#460CDA

background

#F9FCFE

surface

#F2F9FD

border

#CCD2D5

text

#0E1416

muted

#7E8284

Preview Lab

Preview with #51BEE9

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

Preview Lab → · Contrast checker → · Palette generator →