#173C8B#173C8B

#173C8B is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.2% C 0.139 H 262.8°. Best body text is #FFFFFF at 10.22:1 contrast (WCAG AA passes).

Color values

HEX	#173C8B
RGB	rgb(23, 60, 139)
HSL	hsl(221, 72%, 32%)
HSV	hsv(221, 83%, 55%)
CMYK	cmyk(83.5%, 56.8%, 0%, 45.5%)
CIE-LAB	lab(27.51, 18.26, -47.60)
CIE-LCH	lch(27.51, 50.98, 290.98°)
OKLab	oklab(38.15% -0.0174 -0.1374)
OKLCH	oklch(38.15% 0.139 262.8)
XYZ	xyz(6.6277, 5.2772, 25.0904)
Luminance	0.0528 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173C8B #8B6617

analogous

#17768B #173C8B #2C178B

triadic

#173C8B #8B173C #3C8B17

tetradic

#173C8B #8B1776 #8B6617 #178B2C

square

#173C8B #8B1776 #8B6617 #178B2C

split-complementary

#173C8B #8B2C17 #768B17

monochromatic

#060F22 #0E2556 #173C8B #2053C0 #3D71DF

Accessibility & contrast

On white

10.22

#173C8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.06

#173C8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173C8B

10.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173C8B	#FFFFFF	#000000	##FFFFFF
##173C8B	1.00	10.22	2.06	10.22
#FFFFFF	10.22	1.00	21.00	1.00
#000000	2.06	21.00	1.00	21.00
##FFFFFF	10.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478E

Deuteranopia (green-blind)

#003C89

Tritanopia (blue-blind)

#00505D

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #173c8b;
/* rgb */ color: rgb(23, 60, 139);
/* oklch */ color: oklch(38.2% 0.139 262.8);

Tailwind

colors: {
  custom: {
    50: '#6971ae',
    500: '#173c8b',
    950: '#000000',
  },
}

SCSS

$custom: #173c8b;
$custom-light: #6971ae;
$custom-dark: #000000;

JSON

{
  "hex": "#173c8b",
  "rgb": {
    "r": 23,
    "g": 60,
    "b": 139
  },
  "hsl": {
    "h": 220.862,
    "s": 71.605,
    "l": 31.765
  },
  "oklch": {
    "l": 0.38153,
    "c": 0.13851,
    "h": 262.8
  },
  "luminance": 0.05278
}

Semantic roles & 50–950 ramp

primary

#173C8B

secondary

#BF963F

accent

#B539EE

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #173C8B

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

Preview Lab → · Contrast checker → · Palette generator →