#173B72#173B72

#173B72 is a dark, moderate blue. Relative luminance 0.045; OKLCH L 35.9% C 0.104 H 258.9°. Best body text is #FFFFFF at 11.02:1 contrast (WCAG AA passes).

Color values

HEX	#173B72
RGB	rgb(23, 59, 114)
HSL	hsl(216, 66%, 27%)
HSV	hsv(216, 80%, 45%)
CMYK	cmyk(79.8%, 48.2%, 0%, 55.3%)
CIE-LAB	lab(25.33, 8.60, -35.42)
CIE-LCH	lch(25.33, 36.45, 283.64°)
OKLab	oklab(35.9% -0.02 -0.1016)
OKLCH	oklch(35.9% 0.104 258.9)
XYZ	xyz(4.9535, 4.5244, 16.5286)
Luminance	0.0452 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B72 #724E17

analogous

#176972 #173B72 #211772

triadic

#173B72 #72173B #3B7217

tetradic

#173B72 #721769 #724E17 #177221

square

#173B72 #721769 #724E17 #177221

split-complementary

#173B72 #722117 #697217

monochromatic

#050D19 #0D213F #173B72 #2155A5 #2E70D5

Accessibility & contrast

On white

11.02

#173B72 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.91

#173B72 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B72

11.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B72	#FFFFFF	#000000	##FFFFFF
##173B72	1.00	11.02	1.91	11.02
#FFFFFF	11.02	1.00	21.00	1.00
#000000	1.91	21.00	1.00	21.00
##FFFFFF	11.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1E4174

Deuteranopia (green-blind)

#083871

Tritanopia (blue-blind)

#004851

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #173b72;
/* rgb */ color: rgb(23, 59, 114);
/* oklch */ color: oklch(35.9% 0.104 258.9);

Tailwind

colors: {
  custom: {
    50: '#63709b',
    500: '#173b72',
    950: '#000000',
  },
}

SCSS

$custom: #173b72;
$custom-light: #63709b;
$custom-dark: #000000;

JSON

{
  "hex": "#173b72",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 114
  },
  "hsl": {
    "h": 216.264,
    "s": 66.423,
    "l": 26.863
  },
  "oklch": {
    "l": 0.35896,
    "c": 0.10356,
    "h": 258.9
  },
  "luminance": 0.04525
}

Semantic roles & 50–950 ramp

primary

#173B72

secondary

#A87E3D

accent

#A63EE9

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #173B72

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

Preview Lab → · Contrast checker → · Palette generator →