#173A8F#173A8F

#173A8F is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.1% C 0.147 H 263.8°. Best body text is #FFFFFF at 10.30:1 contrast (WCAG AA passes).

Color values

HEX	#173A8F
RGB	rgb(23, 58, 143)
HSL	hsl(223, 72%, 33%)
HSV	hsv(223, 84%, 56%)
CMYK	cmyk(83.9%, 59.4%, 0%, 43.9%)
CIE-LAB	lab(27.27, 21.28, -50.46)
CIE-LCH	lch(27.27, 54.76, 292.87°)
OKLab	oklab(38.08% -0.0158 -0.1458)
OKLCH	oklch(38.08% 0.147 263.8)
XYZ	xyz(6.8226, 5.1906, 26.6236)
Luminance	0.0519 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A8F #8F6C17

analogous

#17768F #173A8F #30178F

triadic

#173A8F #8F173A #3A8F17

tetradic

#173A8F #8F1776 #8F6C17 #178F30

square

#173A8F #8F1776 #8F6C17 #178F30

split-complementary

#173A8F #8F3017 #768F17

monochromatic

#060F26 #0F255A #173A8F #1F4FC4 #406FE0

Accessibility & contrast

On white

10.30

#173A8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#173A8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A8F

10.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A8F	#FFFFFF	#000000	##FFFFFF
##173A8F	1.00	10.30	2.04	10.30
#FFFFFF	10.30	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004692

Deuteranopia (green-blind)

#003B8D

Tritanopia (blue-blind)

#00505E

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #173a8f;
/* rgb */ color: rgb(23, 58, 143);
/* oklch */ color: oklch(38.1% 0.147 263.8);

Tailwind

colors: {
  custom: {
    50: '#6b6fb1',
    500: '#173a8f',
    950: '#000000',
  },
}

SCSS

$custom: #173a8f;
$custom-light: #6b6fb1;
$custom-dark: #000000;

JSON

{
  "hex": "#173a8f",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 143
  },
  "hsl": {
    "h": 222.5,
    "s": 72.289,
    "l": 32.549
  },
  "oklch": {
    "l": 0.38076,
    "c": 0.14671,
    "h": 263.8
  },
  "luminance": 0.05191
}

Semantic roles & 50–950 ramp

primary

#173A8F

secondary

#C19B41

accent

#BA39EF

background

#F6F6FB

surface

#ECECF6

border

#C7C7D0

text

#080711

muted

#7A7A80

Preview Lab

Preview with #173A8F

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

Preview Lab → · Contrast checker → · Palette generator →