#173D8B#173D8B

#173D8B is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.4% C 0.137 H 262.4°. Best body text is #FFFFFF at 10.11:1 contrast (WCAG AA passes).

Color values

HEX	#173D8B
RGB	rgb(23, 61, 139)
HSL	hsl(220, 72%, 32%)
HSV	hsv(220, 83%, 55%)
CMYK	cmyk(83.5%, 56.1%, 0%, 45.5%)
CIE-LAB	lab(27.80, 17.56, -47.13)
CIE-LCH	lch(27.80, 50.29, 290.43°)
OKLab	oklab(38.37% -0.0181 -0.136)
OKLCH	oklch(38.37% 0.137 262.4)
XYZ	xyz(6.6806, 5.3829, 25.1080)
Luminance	0.0538 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173D8B #8B6517

analogous

#17778B #173D8B #2B178B

triadic

#173D8B #8B173D #3D8B17

tetradic

#173D8B #8B1777 #8B6517 #178B2B

square

#173D8B #8B1777 #8B6517 #178B2B

split-complementary

#173D8B #8B2B17 #778B17

monochromatic

#060F22 #0E2656 #173D8B #2054C0 #3D72DF

Accessibility & contrast

On white

10.11

#173D8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#173D8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173D8B

10.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173D8B	#FFFFFF	#000000	##FFFFFF
##173D8B	1.00	10.11	2.08	10.11
#FFFFFF	10.11	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478E

Deuteranopia (green-blind)

#003D89

Tritanopia (blue-blind)

#00505E

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #173d8b;
/* rgb */ color: rgb(23, 61, 139);
/* oklch */ color: oklch(38.4% 0.137 262.4);

Tailwind

colors: {
  custom: {
    50: '#6971ae',
    500: '#173d8b',
    950: '#000000',
  },
}

SCSS

$custom: #173d8b;
$custom-light: #6971ae;
$custom-dark: #000000;

JSON

{
  "hex": "#173d8b",
  "rgb": {
    "r": 23,
    "g": 61,
    "b": 139
  },
  "hsl": {
    "h": 220.345,
    "s": 71.605,
    "l": 31.765
  },
  "oklch": {
    "l": 0.38371,
    "c": 0.13722,
    "h": 262.4
  },
  "luminance": 0.05384
}

Semantic roles & 50–950 ramp

primary

#173D8B

secondary

#BF953F

accent

#B339EE

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #173D8B

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

Preview Lab → · Contrast checker → · Palette generator →