#5166B8#5166B8

#5166B8 is a mid, vivid blue. Relative luminance 0.147; OKLCH L 53.4% C 0.131 H 270.6°. Best body text is #FFFFFF at 5.33:1 contrast (WCAG AA passes).

Color values

HEX	#5166B8
RGB	rgb(81, 102, 184)
HSL	hsl(228, 42%, 52%)
HSV	hsv(228, 56%, 72%)
CMYK	cmyk(56%, 44.6%, 0%, 27.8%)
CIE-LAB	lab(45.24, 16.62, -45.88)
CIE-LCH	lch(45.24, 48.80, 289.91°)
OKLab	oklab(53.4% 0.0015 -0.1306)
OKLCH	oklch(53.4% 0.131 270.6)
XYZ	xyz(16.7936, 14.7115, 47.2928)
Luminance	0.1471 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5166B8 #B8A351

analogous

#519AB8 #5166B8 #7051B8

triadic

#5166B8 #B85166 #66B851

tetradic

#5166B8 #B8519A #B8A351 #51B870

square

#5166B8 #B8519A #B8A351 #51B870

split-complementary

#5166B8 #B87051 #9AB851

monochromatic

#293665 #3B4D91 #5166B8 #7C8CCA #A8B2DB

Accessibility & contrast

On white

5.33

#5166B8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.94

#5166B8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #5166B8

5.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5166B8	#FFFFFF	#000000	##FFFFFF
##5166B8	1.00	5.33	3.94	5.33
#FFFFFF	5.33	1.00	21.00	1.00
#000000	3.94	21.00	1.00	21.00
##FFFFFF	5.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4270BB

Deuteranopia (green-blind)

#3567B6

Tritanopia (blue-blind)

#157886

Achromatopsia (no color)

#6B6B6B

Design tokens & code

CSS

--color: #5166b8;
/* rgb */ color: rgb(81, 102, 184);
/* oklch */ color: oklch(53.4% 0.131 270.6);

Tailwind

colors: {
  custom: {
    50: '#8a91ce',
    500: '#5166b8',
    950: '#000000',
  },
}

SCSS

$custom: #5166b8;
$custom-light: #8a91ce;
$custom-dark: #000000;

JSON

{
  "hex": "#5166b8",
  "rgb": {
    "r": 81,
    "g": 102,
    "b": 184
  },
  "hsl": {
    "h": 227.767,
    "s": 42.041,
    "l": 51.961
  },
  "oklch": {
    "l": 0.53397,
    "c": 0.13059,
    "h": 270.6
  },
  "luminance": 0.14713
}

Semantic roles & 50–950 ramp

primary

#5166B8

secondary

#C9C09C

accent

#B956D2

background

#F8F8FC

surface

#F0F0F9

border

#CBCBD2

text

#0C0C13

muted

#7D7D82

Preview Lab

Preview with #5166B8

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

Preview Lab → · Contrast checker → · Palette generator →