#173D8A#173D8A

#173D8A is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.3% C 0.136 H 262.3°. Best body text is #FFFFFF at 10.14:1 contrast (WCAG AA passes).

Color values

HEX	#173D8A
RGB	rgb(23, 61, 138)
HSL	hsl(220, 71%, 32%)
HSV	hsv(220, 83%, 54%)
CMYK	cmyk(83.3%, 55.8%, 0%, 45.9%)
CIE-LAB	lab(27.72, 17.15, -46.64)
CIE-LCH	lch(27.72, 49.69, 290.19°)
OKLab	oklab(38.29% -0.0182 -0.1346)
OKLCH	oklch(38.29% 0.136 262.3)
XYZ	xyz(6.6079, 5.3538, 24.7250)
Luminance	0.0536 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173D8A #8A6417

analogous

#17778A #173D8A #2B178A

triadic

#173D8A #8A173D #3D8A17

tetradic

#173D8A #8A1777 #8A6417 #178A2B

square

#173D8A #8A1777 #8A6417 #178A2B

split-complementary

#173D8A #8A2B17 #778A17

monochromatic

#060F21 #0E2656 #173D8A #2054BE #3D72DF

Accessibility & contrast

On white

10.14

#173D8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.07

#173D8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173D8A

10.14:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173D8A	#FFFFFF	#000000	##FFFFFF
##173D8A	1.00	10.14	2.07	10.14
#FFFFFF	10.14	1.00	21.00	1.00
#000000	2.07	21.00	1.00	21.00
##FFFFFF	10.14	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478D

Deuteranopia (green-blind)

#003C88

Tritanopia (blue-blind)

#00505D

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #173d8a;
/* rgb */ color: rgb(23, 61, 138);
/* oklch */ color: oklch(38.3% 0.136 262.3);

Tailwind

colors: {
  custom: {
    50: '#6971ad',
    500: '#173d8a',
    950: '#000000',
  },
}

SCSS

$custom: #173d8a;
$custom-light: #6971ad;
$custom-dark: #000000;

JSON

{
  "hex": "#173d8a",
  "rgb": {
    "r": 23,
    "g": 61,
    "b": 138
  },
  "hsl": {
    "h": 220.174,
    "s": 71.429,
    "l": 31.569
  },
  "oklch": {
    "l": 0.38286,
    "c": 0.1358,
    "h": 262.3
  },
  "luminance": 0.05355
}

Semantic roles & 50–950 ramp

primary

#173D8A

secondary

#BE943F

accent

#B33AEE

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #173D8A

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

Preview Lab → · Contrast checker → · Palette generator →