#173571#173571

#173571 is a dark, moderate blue. Relative luminance 0.039; OKLCH L 34.4% C 0.110 H 262.3°. Best body text is #FFFFFF at 11.77:1 contrast (WCAG AA passes).

Color values

HEX	#173571
RGB	rgb(23, 53, 113)
HSL	hsl(220, 66%, 27%)
HSV	hsv(220, 80%, 44%)
CMYK	cmyk(79.6%, 53.1%, 0%, 55.7%)
CIE-LAB	lab(23.41, 12.44, -37.89)
CIE-LCH	lch(23.41, 39.88, 288.17°)
OKLab	oklab(34.39% -0.0148 -0.109)
OKLCH	oklch(34.39% 0.11 262.3)
XYZ	xyz(4.6060, 3.9201, 16.1335)
Luminance	0.0392 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173571 #715317

analogous

#176271 #173571 #261771

triadic

#173571 #711735 #357117

tetradic

#173571 #711762 #715317 #177126

square

#173571 #711762 #715317 #177126

split-complementary

#173571 #712617 #627117

monochromatic

#050C19 #0D1D3E #173571 #214DA4 #2E65D4

Accessibility & contrast

On white

11.77

#173571 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.78

#173571 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173571

11.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173571	#FFFFFF	#000000	##FFFFFF
##173571	1.00	11.77	1.78	11.77
#FFFFFF	11.77	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0F3C73

Deuteranopia (green-blind)

#003470

Tritanopia (blue-blind)

#00434D

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #173571;
/* rgb */ color: rgb(23, 53, 113);
/* oklch */ color: oklch(34.4% 0.110 262.3);

Tailwind

colors: {
  custom: {
    50: '#636b9a',
    500: '#173571',
    950: '#000000',
  },
}

SCSS

$custom: #173571;
$custom-light: #636b9a;
$custom-dark: #000000;

JSON

{
  "hex": "#173571",
  "rgb": {
    "r": 23,
    "g": 53,
    "b": 113
  },
  "hsl": {
    "h": 220,
    "s": 66.176,
    "l": 26.667
  },
  "oklch": {
    "l": 0.34393,
    "c": 0.11,
    "h": 262.3
  },
  "luminance": 0.03921
}

Semantic roles & 50–950 ramp

primary

#173571

secondary

#A7833D

accent

#B03FE9

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060E

muted

#7A7A7E

Preview Lab

Preview with #173571

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

Preview Lab → · Contrast checker → · Palette generator →