#173A85#173A85

#173A85 is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.2% C 0.133 H 262.8°. Best body text is #FFFFFF at 10.60:1 contrast (WCAG AA passes).

Color values

HEX	#173A85
RGB	rgb(23, 58, 133)
HSL	hsl(221, 71%, 31%)
HSV	hsv(221, 83%, 52%)
CMYK	cmyk(82.7%, 56.4%, 0%, 47.8%)
CIE-LAB	lab(26.45, 17.19, -45.59)
CIE-LCH	lch(26.45, 48.73, 290.66°)
OKLab	oklab(37.2% -0.0165 -0.1315)
OKLCH	oklch(37.2% 0.133 262.8)
XYZ	xyz(6.0985, 4.9010, 22.8103)
Luminance	0.0490 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A85 #856217

analogous

#177185 #173A85 #2B1785

triadic

#173A85 #85173A #3A8517

tetradic

#173A85 #851771 #856217 #17852B

square

#173A85 #851771 #856217 #17852B

split-complementary

#173A85 #852B17 #718517

monochromatic

#050C1D #0E2351 #173A85 #2051B9 #3A6EDD

Accessibility & contrast

On white

10.60

#173A85 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#173A85 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A85

10.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A85	#FFFFFF	#000000	##FFFFFF
##173A85	1.00	10.60	1.98	10.60
#FFFFFF	10.60	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004488

Deuteranopia (green-blind)

#003A84

Tritanopia (blue-blind)

#004D59

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #173a85;
/* rgb */ color: rgb(23, 58, 133);
/* oklch */ color: oklch(37.2% 0.133 262.8);

Tailwind

colors: {
  custom: {
    50: '#686fa9',
    500: '#173a85',
    950: '#000000',
  },
}

SCSS

$custom: #173a85;
$custom-light: #686fa9;
$custom-dark: #000000;

JSON

{
  "hex": "#173a85",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 133
  },
  "hsl": {
    "h": 220.909,
    "s": 70.513,
    "l": 30.588
  },
  "oklch": {
    "l": 0.372,
    "c": 0.13259,
    "h": 262.8
  },
  "luminance": 0.04902
}

Semantic roles & 50–950 ramp

primary

#173A85

secondary

#B9923F

accent

#B43BED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #173A85

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

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