#5166BB#5166BB

#5166BB is a mid, vivid blue. Relative luminance 0.148; OKLCH L 53.6% C 0.135 H 270.8°. Best body text is #FFFFFF at 5.29:1 contrast (WCAG AA passes).

Color values

HEX	#5166BB
RGB	rgb(81, 102, 187)
HSL	hsl(228, 44%, 53%)
HSV	hsv(228, 57%, 73%)
CMYK	cmyk(56.7%, 45.5%, 0%, 26.7%)
CIE-LAB	lab(45.41, 17.62, -47.35)
CIE-LCH	lch(45.41, 50.52, 290.41°)
OKLab	oklab(53.59% 0.0019 -0.1349)
OKLCH	oklch(53.59% 0.135 270.8)
XYZ	xyz(17.1114, 14.8387, 48.9665)
Luminance	0.1484 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5166BB #BBA651

analogous

#519BBB #5166BB #7151BB

triadic

#5166BB #BB5166 #66BB51

tetradic

#5166BB #BB519B #BBA651 #51BB71

square

#5166BB #BB519B #BBA651 #51BB71

split-complementary

#5166BB #BB7151 #9BBB51

monochromatic

#293669 #3A4C95 #5166BB #7D8DCC #A9B3DD

Accessibility & contrast

On white

5.29

#5166BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.97

#5166BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #5166BB

5.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5166BB	#FFFFFF	#000000	##FFFFFF
##5166BB	1.00	5.29	3.97	5.29
#FFFFFF	5.29	1.00	21.00	1.00
#000000	3.97	21.00	1.00	21.00
##FFFFFF	5.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4070BE

Deuteranopia (green-blind)

#3167B9

Tritanopia (blue-blind)

#0E7987

Achromatopsia (no color)

#6B6B6B

Design tokens & code

CSS

--color: #5166bb;
/* rgb */ color: rgb(81, 102, 187);
/* oklch */ color: oklch(53.6% 0.135 270.8);

Tailwind

colors: {
  custom: {
    50: '#8a91d0',
    500: '#5166bb',
    950: '#000000',
  },
}

SCSS

$custom: #5166bb;
$custom-light: #8a91d0;
$custom-dark: #000000;

JSON

{
  "hex": "#5166bb",
  "rgb": {
    "r": 81,
    "g": 102,
    "b": 187
  },
  "hsl": {
    "h": 228.113,
    "s": 43.802,
    "l": 52.549
  },
  "oklch": {
    "l": 0.53588,
    "c": 0.13488,
    "h": 270.8
  },
  "luminance": 0.1484
}

Semantic roles & 50–950 ramp

primary

#5166BB

secondary

#CBC29D

accent

#BA54D4

background

#F8F8FC

surface

#F0F0F9

border

#CBCBD2

text

#0C0C14

muted

#7D7D82

Preview Lab

Preview with #5166BB

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

Preview Lab → · Contrast checker → · Palette generator →