#5166CC#5166CC

#5166CC is a mid, vivid blue. Relative luminance 0.156; OKLCH L 54.7% C 0.159 H 271.5°. Best body text is #FFFFFF at 5.09:1 contrast (WCAG AA passes).

Color values

HEX	#5166CC
RGB	rgb(81, 102, 204)
HSL	hsl(230, 55%, 56%)
HSV	hsv(230, 60%, 80%)
CMYK	cmyk(60.3%, 50%, 0%, 20%)
CIE-LAB	lab(46.46, 23.34, -55.48)
CIE-LCH	lch(46.46, 60.19, 292.82°)
OKLab	oklab(54.72% 0.0041 -0.1588)
OKLCH	oklch(54.72% 0.159 271.5)
XYZ	xyz(19.0402, 15.6102, 59.1247)
Luminance	0.1561 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5166CC #CCB751

analogous

#51A3CC #5166CC #7951CC

triadic

#5166CC #CC5166 #66CC51

tetradic

#5166CC #CC51A3 #CCB751 #51CC79

square

#5166CC #CC51A3 #CCB751 #51CC79

split-complementary

#5166CC #CC7951 #A3CC51

monochromatic

#25347E #3348AD #5166CC #8090DA #B0B9E8

Accessibility & contrast

On white

5.09

#5166CC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.12

#5166CC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #5166CC

5.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5166CC	#FFFFFF	#000000	##FFFFFF
##5166CC	1.00	5.09	4.12	5.09
#FFFFFF	5.09	1.00	21.00	1.00
#000000	4.12	21.00	1.00	21.00
##FFFFFF	5.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2F74D0

Deuteranopia (green-blind)

#1469CA

Tritanopia (blue-blind)

#007D8F

Achromatopsia (no color)

#6E6E6E

Design tokens & code

CSS

--color: #5166cc;
/* rgb */ color: rgb(81, 102, 204);
/* oklch */ color: oklch(54.7% 0.159 271.5);

Tailwind

colors: {
  custom: {
    50: '#8d91dc',
    500: '#5166cc',
    950: '#000000',
  },
}

SCSS

$custom: #5166cc;
$custom-light: #8d91dc;
$custom-dark: #000000;

JSON

{
  "hex": "#5166cc",
  "rgb": {
    "r": 81,
    "g": 102,
    "b": 204
  },
  "hsl": {
    "h": 229.756,
    "s": 54.667,
    "l": 55.882
  },
  "oklch": {
    "l": 0.54721,
    "c": 0.15883,
    "h": 271.5
  },
  "luminance": 0.15612
}

Semantic roles & 50–950 ramp

primary

#5166CC

secondary

#D6CDA3

accent

#C54ADE

background

#F9F8FD

surface

#F1F0FB

border

#CBCBD4

text

#0D0C15

muted

#7E7D83

Preview Lab

Preview with #5166CC

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

Preview Lab → · Contrast checker → · Palette generator →