#173D8E#173D8E

#173D8E is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.6% C 0.141 H 262.7°. Best body text is #FFFFFF at 10.03:1 contrast (WCAG AA passes).

Color values

HEX	#173D8E
RGB	rgb(23, 61, 142)
HSL	hsl(221, 72%, 32%)
HSV	hsv(221, 84%, 56%)
CMYK	cmyk(83.8%, 57%, 0%, 44.3%)
CIE-LAB	lab(28.04, 18.79, -48.59)
CIE-LCH	lch(28.04, 52.10, 291.14°)
OKLab	oklab(38.63% -0.0179 -0.1403)
OKLCH	oklch(38.63% 0.141 262.7)
XYZ	xyz(6.9028, 5.4718, 26.2783)
Luminance	0.0547 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173D8E #8E6817

analogous

#17798E #173D8E #2C178E

triadic

#173D8E #8E173D #3D8E17

tetradic

#173D8E #8E1779 #8E6817 #178E2C

square

#173D8E #8E1779 #8E6817 #178E2C

split-complementary

#173D8E #8E2C17 #798E17

monochromatic

#061025 #0E2659 #173D8E #2054C3 #3F73E0

Accessibility & contrast

On white

10.03

#173D8E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.09

#173D8E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173D8E

10.03:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173D8E	#FFFFFF	#000000	##FFFFFF
##173D8E	1.00	10.03	2.09	10.03
#FFFFFF	10.03	1.00	21.00	1.00
#000000	2.09	21.00	1.00	21.00
##FFFFFF	10.03	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004891

Deuteranopia (green-blind)

#003D8C

Tritanopia (blue-blind)

#00515F

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #173d8e;
/* rgb */ color: rgb(23, 61, 142);
/* oklch */ color: oklch(38.6% 0.141 262.7);

Tailwind

colors: {
  custom: {
    50: '#6a71b0',
    500: '#173d8e',
    950: '#000000',
  },
}

SCSS

$custom: #173d8e;
$custom-light: #6a71b0;
$custom-dark: #000000;

JSON

{
  "hex": "#173d8e",
  "rgb": {
    "r": 23,
    "g": 61,
    "b": 142
  },
  "hsl": {
    "h": 220.84,
    "s": 72.121,
    "l": 32.353
  },
  "oklch": {
    "l": 0.38628,
    "c": 0.14145,
    "h": 262.7
  },
  "luminance": 0.05473
}

Semantic roles & 50–950 ramp

primary

#173D8E

secondary

#C09740

accent

#B539EF

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #173D8E

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

Preview Lab → · Contrast checker → · Palette generator →