#173B85#173B85

#173B85 is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.4% C 0.131 H 262.4°. Best body text is #FFFFFF at 10.50:1 contrast (WCAG AA passes).

Color values

HEX	#173B85
RGB	rgb(23, 59, 133)
HSL	hsl(220, 71%, 31%)
HSV	hsv(220, 83%, 52%)
CMYK	cmyk(82.7%, 55.6%, 0%, 47.8%)
CIE-LAB	lab(26.74, 16.49, -45.12)
CIE-LCH	lch(26.74, 48.04, 290.08°)
OKLab	oklab(37.42% -0.0173 -0.1301)
OKLCH	oklch(37.42% 0.131 262.4)
XYZ	xyz(6.1494, 5.0028, 22.8273)
Luminance	0.0500 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B85 #856117

analogous

#177285 #173B85 #2A1785

triadic

#173B85 #85173B #3B8517

tetradic

#173B85 #851772 #856117 #17852A

square

#173B85 #851772 #856117 #17852A

split-complementary

#173B85 #852A17 #728517

monochromatic

#050D1D #0E2451 #173B85 #2052B9 #3A6FDD

Accessibility & contrast

On white

10.50

#173B85 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#173B85 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B85

10.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B85	#FFFFFF	#000000	##FFFFFF
##173B85	1.00	10.50	2.00	10.50
#FFFFFF	10.50	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.50	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004488

Deuteranopia (green-blind)

#003A84

Tritanopia (blue-blind)

#004D5A

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #173b85;
/* rgb */ color: rgb(23, 59, 133);
/* oklch */ color: oklch(37.4% 0.131 262.4);

Tailwind

colors: {
  custom: {
    50: '#6870a9',
    500: '#173b85',
    950: '#000000',
  },
}

SCSS

$custom: #173b85;
$custom-light: #6870a9;
$custom-dark: #000000;

JSON

{
  "hex": "#173b85",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 133
  },
  "hsl": {
    "h": 220.364,
    "s": 70.513,
    "l": 30.588
  },
  "oklch": {
    "l": 0.37421,
    "c": 0.13128,
    "h": 262.4
  },
  "luminance": 0.05004
}

Semantic roles & 50–950 ramp

primary

#173B85

secondary

#B9913F

accent

#B33BED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #173B85

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

Preview Lab → · Contrast checker → · Palette generator →