#173371#173371

#173371 is a dark, moderate blue. Relative luminance 0.037; OKLCH L 33.9% C 0.113 H 263.3°. Best body text is #FFFFFF at 12.01:1 contrast (WCAG AA passes).

Color values

HEX	#173371
RGB	rgb(23, 51, 113)
HSL	hsl(221, 66%, 27%)
HSV	hsv(221, 80%, 44%)
CMYK	cmyk(79.6%, 54.9%, 0%, 55.7%)
CIE-LAB	lab(22.80, 13.87, -38.87)
CIE-LCH	lch(22.80, 41.27, 289.64°)
OKLab	oklab(33.93% -0.0131 -0.1119)
OKLCH	oklch(33.93% 0.113 263.3)
XYZ	xyz(4.5167, 3.7416, 16.1037)
Luminance	0.0374 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173371 #715517

analogous

#176071 #173371 #281771

triadic

#173371 #711733 #337117

tetradic

#173371 #711760 #715517 #177128

square

#173371 #711760 #715517 #177128

split-complementary

#173371 #712817 #607117

monochromatic

#050B19 #0D1C3E #173371 #214AA4 #2E62D4

Accessibility & contrast

On white

12.01

#173371 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.75

#173371 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173371

12.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173371	#FFFFFF	#000000	##FFFFFF
##173371	1.00	12.01	1.75	12.01
#FFFFFF	12.01	1.00	21.00	1.00
#000000	1.75	21.00	1.00	21.00
##FFFFFF	12.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#083B73

Deuteranopia (green-blind)

#003270

Tritanopia (blue-blind)

#00424C

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #173371;
/* rgb */ color: rgb(23, 51, 113);
/* oklch */ color: oklch(33.9% 0.113 263.3);

Tailwind

colors: {
  custom: {
    50: '#636a9a',
    500: '#173371',
    950: '#000000',
  },
}

SCSS

$custom: #173371;
$custom-light: #636a9a;
$custom-dark: #000000;

JSON

{
  "hex": "#173371",
  "rgb": {
    "r": 23,
    "g": 51,
    "b": 113
  },
  "hsl": {
    "h": 221.333,
    "s": 66.176,
    "l": 26.667
  },
  "oklch": {
    "l": 0.33931,
    "c": 0.11269,
    "h": 263.3
  },
  "luminance": 0.03742
}

Semantic roles & 50–950 ramp

primary

#173371

secondary

#A7863D

accent

#B43FE9

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060E

muted

#7A7A7E

Preview Lab

Preview with #173371

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

Preview Lab → · Contrast checker → · Palette generator →