#173D8D#173D8D

#173D8D is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.5% C 0.140 H 262.6°. Best body text is #FFFFFF at 10.05:1 contrast (WCAG AA passes).

Color values

HEX	#173D8D
RGB	rgb(23, 61, 141)
HSL	hsl(221, 72%, 32%)
HSV	hsv(221, 84%, 55%)
CMYK	cmyk(83.7%, 56.7%, 0%, 44.7%)
CIE-LAB	lab(27.96, 18.38, -48.11)
CIE-LCH	lch(27.96, 51.50, 290.91°)
OKLab	oklab(38.54% -0.018 -0.1389)
OKLCH	oklch(38.54% 0.14 262.6)
XYZ	xyz(6.8281, 5.4419, 25.8847)
Luminance	0.0544 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173D8D #8D6717

analogous

#17788D #173D8D #2C178D

triadic

#173D8D #8D173D #3D8D17

tetradic

#173D8D #8D1778 #8D6717 #178D2C

square

#173D8D #8D1778 #8D6717 #178D2C

split-complementary

#173D8D #8D2C17 #788D17

monochromatic

#060F24 #0E2658 #173D8D #2054C2 #3F73E0

Accessibility & contrast

On white

10.05

#173D8D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.09

#173D8D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173D8D

10.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173D8D	#FFFFFF	#000000	##FFFFFF
##173D8D	1.00	10.05	2.09	10.05
#FFFFFF	10.05	1.00	21.00	1.00
#000000	2.09	21.00	1.00	21.00
##FFFFFF	10.05	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004890

Deuteranopia (green-blind)

#003D8B

Tritanopia (blue-blind)

#00515F

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #173d8d;
/* rgb */ color: rgb(23, 61, 141);
/* oklch */ color: oklch(38.5% 0.140 262.6);

Tailwind

colors: {
  custom: {
    50: '#6a71af',
    500: '#173d8d',
    950: '#000000',
  },
}

SCSS

$custom: #173d8d;
$custom-light: #6a71af;
$custom-dark: #000000;

JSON

{
  "hex": "#173d8d",
  "rgb": {
    "r": 23,
    "g": 61,
    "b": 141
  },
  "hsl": {
    "h": 220.678,
    "s": 71.951,
    "l": 32.157
  },
  "oklch": {
    "l": 0.38542,
    "c": 0.14004,
    "h": 262.6
  },
  "luminance": 0.05443
}

Semantic roles & 50–950 ramp

primary

#173D8D

secondary

#C09740

accent

#B439EF

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #173D8D

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

Preview Lab → · Contrast checker → · Palette generator →