#5171BB#5171BB

#5171BB is a mid, vivid blue. Relative luminance 0.171; OKLCH L 55.9% C 0.121 H 265.1°. Best body text is #FFFFFF at 4.74:1 contrast (WCAG AA passes).

Color values

HEX	#5171BB
RGB	rgb(81, 113, 187)
HSL	hsl(222, 44%, 53%)
HSV	hsv(222, 57%, 73%)
CMYK	cmyk(56.7%, 39.6%, 0%, 26.7%)
CIE-LAB	lab(48.44, 10.76, -42.52)
CIE-LCH	lch(48.44, 43.86, 284.20°)
OKLab	oklab(55.92% -0.0104 -0.1206)
OKLCH	oklch(55.92% 0.121 265.1)
XYZ	xyz(18.2651, 17.1460, 49.3511)
Luminance	0.1715 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5171BB #BB9B51

analogous

#51A6BB #5171BB #6651BB

triadic

#5171BB #BB5171 #71BB51

tetradic

#5171BB #BB51A6 #BB9B51 #51BB66

square

#5171BB #BB51A6 #BB9B51 #51BB66

split-complementary

#5171BB #BB6651 #A6BB51

monochromatic

#293C69 #3A5595 #5171BB #7D95CC #A9B9DD

Accessibility & contrast

On white

4.74

#5171BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.43

#5171BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #5171BB

4.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5171BB	#FFFFFF	#000000	##FFFFFF
##5171BB	1.00	4.74	4.43	4.74
#FFFFFF	4.74	1.00	21.00	1.00
#000000	4.43	21.00	1.00	21.00
##FFFFFF	4.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5278BE

Deuteranopia (green-blind)

#456FB9

Tritanopia (blue-blind)

#06818D

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #5171bb;
/* rgb */ color: rgb(81, 113, 187);
/* oklch */ color: oklch(55.9% 0.121 265.1);

Tailwind

colors: {
  custom: {
    50: '#8a99d0',
    500: '#5171bb',
    950: '#000000',
  },
}

SCSS

$custom: #5171bb;
$custom-light: #8a99d0;
$custom-dark: #000000;

JSON

{
  "hex": "#5171bb",
  "rgb": {
    "r": 81,
    "g": 113,
    "b": 187
  },
  "hsl": {
    "h": 221.887,
    "s": 43.802,
    "l": 52.549
  },
  "oklch": {
    "l": 0.55916,
    "c": 0.12106,
    "h": 265.1
  },
  "luminance": 0.17147
}

Semantic roles & 50–950 ramp

primary

#5171BB

secondary

#CBBD9D

accent

#AD54D4

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0C0D14

muted

#7D7E82

Preview Lab

Preview with #5171BB

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

Preview Lab → · Contrast checker → · Palette generator →