#5166B4#5166B4

#5166B4 is a mid, vivid blue. Relative luminance 0.145; OKLCH L 53.1% C 0.125 H 270.4°. Best body text is #FFFFFF at 5.37:1 contrast (WCAG AA passes).

Color values

HEX	#5166B4
RGB	rgb(81, 102, 180)
HSL	hsl(227, 40%, 51%)
HSV	hsv(227, 55%, 71%)
CMYK	cmyk(55%, 43.3%, 0%, 29.4%)
CIE-LAB	lab(45.01, 15.29, -43.92)
CIE-LCH	lch(45.01, 46.50, 289.19°)
OKLab	oklab(53.15% 0.0008 -0.1248)
OKLCH	oklch(53.15% 0.125 270.4)
XYZ	xyz(16.3802, 14.5462, 45.1157)
Luminance	0.1455 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5166B4 #B49F51

analogous

#5197B4 #5166B4 #6D51B4

triadic

#5166B4 #B45166 #66B451

tetradic

#5166B4 #B45197 #B49F51 #51B46D

square

#5166B4 #B45197 #B49F51 #51B46D

split-complementary

#5166B4 #B46D51 #97B451

monochromatic

#2A3561 #3C4D8C #5166B4 #7C8CC6 #A7B1D9

Accessibility & contrast

On white

5.37

#5166B4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.91

#5166B4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #5166B4

5.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5166B4	#FFFFFF	#000000	##FFFFFF
##5166B4	1.00	5.37	3.91	5.37
#FFFFFF	5.37	1.00	21.00	1.00
#000000	3.91	21.00	1.00	21.00
##FFFFFF	5.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#456FB7

Deuteranopia (green-blind)

#3966B2

Tritanopia (blue-blind)

#1C7784

Achromatopsia (no color)

#6A6A6A

Design tokens & code

CSS

--color: #5166b4;
/* rgb */ color: rgb(81, 102, 180);
/* oklch */ color: oklch(53.1% 0.125 270.4);

Tailwind

colors: {
  custom: {
    50: '#8991cb',
    500: '#5166b4',
    950: '#000000',
  },
}

SCSS

$custom: #5166b4;
$custom-light: #8991cb;
$custom-dark: #000000;

JSON

{
  "hex": "#5166b4",
  "rgb": {
    "r": 81,
    "g": 102,
    "b": 180
  },
  "hsl": {
    "h": 227.273,
    "s": 39.759,
    "l": 51.176
  },
  "oklch": {
    "l": 0.53146,
    "c": 0.12482,
    "h": 270.4
  },
  "luminance": 0.14547
}

Semantic roles & 50–950 ramp

primary

#5166B4

secondary

#C6BD9B

accent

#B658D0

background

#F8F8FC

surface

#F0F0F8

border

#CBCBD1

text

#0C0C13

muted

#7D7D82

Preview Lab

Preview with #5166B4

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

Preview Lab → · Contrast checker → · Palette generator →