#173B8D#173B8D

#173B8D is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.1% C 0.143 H 263.3°. Best body text is #FFFFFF at 10.26:1 contrast (WCAG AA passes).

Color values

HEX	#173B8D
RGB	rgb(23, 59, 141)
HSL	hsl(222, 72%, 32%)
HSV	hsv(222, 84%, 55%)
CMYK	cmyk(83.7%, 58.2%, 0%, 44.7%)
CIE-LAB	lab(27.39, 19.77, -49.04)
CIE-LCH	lch(27.39, 52.87, 291.96°)
OKLab	oklab(38.11% -0.0166 -0.1416)
OKLCH	oklch(38.11% 0.143 263.3)
XYZ	xyz(6.7233, 5.2324, 25.8497)
Luminance	0.0523 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B8D #8D6917

analogous

#17768D #173B8D #2E178D

triadic

#173B8D #8D173B #3B8D17

tetradic

#173B8D #8D1776 #8D6917 #178D2E

square

#173B8D #8D1776 #8D6917 #178D2E

split-complementary

#173B8D #8D2E17 #768D17

monochromatic

#060F24 #0E2558 #173B8D #2051C2 #3F70E0

Accessibility & contrast

On white

10.26

#173B8D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.05

#173B8D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B8D

10.26:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B8D	#FFFFFF	#000000	##FFFFFF
##173B8D	1.00	10.26	2.05	10.26
#FFFFFF	10.26	1.00	21.00	1.00
#000000	2.05	21.00	1.00	21.00
##FFFFFF	10.26	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004690

Deuteranopia (green-blind)

#003B8B

Tritanopia (blue-blind)

#00505E

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #173b8d;
/* rgb */ color: rgb(23, 59, 141);
/* oklch */ color: oklch(38.1% 0.143 263.3);

Tailwind

colors: {
  custom: {
    50: '#6a70af',
    500: '#173b8d',
    950: '#000000',
  },
}

SCSS

$custom: #173b8d;
$custom-light: #6a70af;
$custom-dark: #000000;

JSON

{
  "hex": "#173b8d",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 141
  },
  "hsl": {
    "h": 221.695,
    "s": 71.951,
    "l": 32.157
  },
  "oklch": {
    "l": 0.38111,
    "c": 0.14262,
    "h": 263.3
  },
  "luminance": 0.05233
}

Semantic roles & 50–950 ramp

primary

#173B8D

secondary

#C09940

accent

#B739EF

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #173B8D

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

Preview Lab → · Contrast checker → · Palette generator →