#173C8E#173C8E

#173C8E is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.4% C 0.143 H 263.1°. Best body text is #FFFFFF at 10.13:1 contrast (WCAG AA passes).

Color values

HEX	#173C8E
RGB	rgb(23, 60, 142)
HSL	hsl(221, 72%, 32%)
HSV	hsv(221, 84%, 56%)
CMYK	cmyk(83.8%, 57.7%, 0%, 44.3%)
CIE-LAB	lab(27.75, 19.48, -49.06)
CIE-LCH	lch(27.75, 52.78, 291.66°)
OKLab	oklab(38.41% -0.0172 -0.1417)
OKLCH	oklch(38.41% 0.143 263.1)
XYZ	xyz(6.8499, 5.3660, 26.2607)
Luminance	0.0537 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173C8E #8E6917

analogous

#17778E #173C8E #2E178E

triadic

#173C8E #8E173C #3C8E17

tetradic

#173C8E #8E1777 #8E6917 #178E2E

square

#173C8E #8E1777 #8E6917 #178E2E

split-complementary

#173C8E #8E2E17 #778E17

monochromatic

#060F25 #0E2659 #173C8E #2052C3 #3F71E0

Accessibility & contrast

On white

10.13

#173C8E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.07

#173C8E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173C8E

10.13:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173C8E	#FFFFFF	#000000	##FFFFFF
##173C8E	1.00	10.13	2.07	10.13
#FFFFFF	10.13	1.00	21.00	1.00
#000000	2.07	21.00	1.00	21.00
##FFFFFF	10.13	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004791

Deuteranopia (green-blind)

#003C8C

Tritanopia (blue-blind)

#00515F

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #173c8e;
/* rgb */ color: rgb(23, 60, 142);
/* oklch */ color: oklch(38.4% 0.143 263.1);

Tailwind

colors: {
  custom: {
    50: '#6a71b0',
    500: '#173c8e',
    950: '#000000',
  },
}

SCSS

$custom: #173c8e;
$custom-light: #6a71b0;
$custom-dark: #000000;

JSON

{
  "hex": "#173c8e",
  "rgb": {
    "r": 23,
    "g": 60,
    "b": 142
  },
  "hsl": {
    "h": 221.345,
    "s": 72.121,
    "l": 32.353
  },
  "oklch": {
    "l": 0.38412,
    "c": 0.14274,
    "h": 263.1
  },
  "luminance": 0.05367
}

Semantic roles & 50–950 ramp

primary

#173C8E

secondary

#C09940

accent

#B639EF

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #173C8E

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

Preview Lab → · Contrast checker → · Palette generator →