#5166B9#5166B9

#5166B9 is a mid, vivid blue. Relative luminance 0.148; OKLCH L 53.5% C 0.132 H 270.7°. Best body text is #FFFFFF at 5.32:1 contrast (WCAG AA passes).

Color values

HEX	#5166B9
RGB	rgb(81, 102, 185)
HSL	hsl(228, 43%, 52%)
HSV	hsv(228, 56%, 73%)
CMYK	cmyk(56.2%, 44.9%, 0%, 27.5%)
CIE-LAB	lab(45.29, 16.95, -46.37)
CIE-LCH	lch(45.29, 49.37, 290.08°)
OKLab	oklab(53.46% 0.0016 -0.132)
OKLCH	oklch(53.46% 0.132 270.7)
XYZ	xyz(16.8988, 14.7536, 47.8468)
Luminance	0.1475 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5166B9 #B9A451

analogous

#519AB9 #5166B9 #7051B9

triadic

#5166B9 #B95166 #66B951

tetradic

#5166B9 #B9519A #B9A451 #51B970

square

#5166B9 #B9519A #B9A451 #51B970

split-complementary

#5166B9 #B97051 #9AB951

monochromatic

#293666 #3B4C92 #5166B9 #7D8CCB #A8B3DC

Accessibility & contrast

On white

5.32

#5166B9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.95

#5166B9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #5166B9

5.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5166B9	#FFFFFF	#000000	##FFFFFF
##5166B9	1.00	5.32	3.95	5.32
#FFFFFF	5.32	1.00	21.00	1.00
#000000	3.95	21.00	1.00	21.00
##FFFFFF	5.32	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4170BC

Deuteranopia (green-blind)

#3467B7

Tritanopia (blue-blind)

#137886

Achromatopsia (no color)

#6B6B6B

Design tokens & code

CSS

--color: #5166b9;
/* rgb */ color: rgb(81, 102, 185);
/* oklch */ color: oklch(53.5% 0.132 270.7);

Tailwind

colors: {
  custom: {
    50: '#8a91ce',
    500: '#5166b9',
    950: '#000000',
  },
}

SCSS

$custom: #5166b9;
$custom-light: #8a91ce;
$custom-dark: #000000;

JSON

{
  "hex": "#5166b9",
  "rgb": {
    "r": 81,
    "g": 102,
    "b": 185
  },
  "hsl": {
    "h": 227.885,
    "s": 42.623,
    "l": 52.157
  },
  "oklch": {
    "l": 0.53461,
    "c": 0.13202,
    "h": 270.7
  },
  "luminance": 0.14755
}

Semantic roles & 50–950 ramp

primary

#5166B9

secondary

#CAC09C

accent

#B955D2

background

#F8F8FC

surface

#F0F0F9

border

#CBCBD2

text

#0C0C14

muted

#7D7D82

Preview Lab

Preview with #5166B9

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

Preview Lab → · Contrast checker → · Palette generator →