#173D9E#173D9E

#173D9E is a dark, vivid blue. Relative luminance 0.060; OKLCH L 40.1% C 0.164 H 264.0°. Best body text is #FFFFFF at 9.56:1 contrast (WCAG AA passes).

Color values

HEX	#173D9E
RGB	rgb(23, 61, 158)
HSL	hsl(223, 75%, 35%)
HSV	hsv(223, 85%, 62%)
CMYK	cmyk(85.4%, 61.4%, 0%, 38%)
CIE-LAB	lab(29.38, 25.25, -56.19)
CIE-LCH	lch(29.38, 61.60, 294.20°)
OKLab	oklab(40.05% -0.017 -0.1626)
OKLCH	oklch(40.05% 0.164 264)
XYZ	xyz(8.1914, 5.9873, 33.0650)
Luminance	0.0599 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173D9E #9E7817

analogous

#17809E #173D9E #34179E

triadic

#173D9E #9E173D #3D9E17

tetradic

#173D9E #9E1780 #9E7817 #179E34

square

#173D9E #9E1780 #9E7817 #179E34

split-complementary

#173D9E #9E3417 #809E17

monochromatic

#071433 #0F2869 #173D9E #1F52D3 #4B76E5

Accessibility & contrast

On white

9.56

#173D9E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.20

#173D9E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173D9E

9.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173D9E	#FFFFFF	#000000	##FFFFFF
##173D9E	1.00	9.56	2.20	9.56
#FFFFFF	9.56	1.00	21.00	1.00
#000000	2.20	21.00	1.00	21.00
##FFFFFF	9.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004CA1

Deuteranopia (green-blind)

#003F9C

Tritanopia (blue-blind)

#005667

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #173d9e;
/* rgb */ color: rgb(23, 61, 158);
/* oklch */ color: oklch(40.1% 0.164 264.0);

Tailwind

colors: {
  custom: {
    50: '#6f72bc',
    500: '#173d9e',
    950: '#000000',
  },
}

SCSS

$custom: #173d9e;
$custom-light: #6f72bc;
$custom-dark: #000000;

JSON

{
  "hex": "#173d9e",
  "rgb": {
    "r": 23,
    "g": 61,
    "b": 158
  },
  "hsl": {
    "h": 223.111,
    "s": 74.586,
    "l": 35.49
  },
  "oklch": {
    "l": 0.40054,
    "c": 0.1635,
    "h": 264
  },
  "luminance": 0.05988
}

Semantic roles & 50–950 ramp

primary

#173D9E

secondary

#C6A34A

accent

#BD37F1

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #173D9E

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

Preview Lab → · Contrast checker → · Palette generator →