#173A8E#173A8E

#173A8E is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.0% C 0.145 H 263.7°. Best body text is #FFFFFF at 10.33:1 contrast (WCAG AA passes).

Color values

HEX	#173A8E
RGB	rgb(23, 58, 142)
HSL	hsl(222, 72%, 32%)
HSV	hsv(222, 84%, 56%)
CMYK	cmyk(83.8%, 59.2%, 0%, 44.3%)
CIE-LAB	lab(27.19, 20.88, -49.98)
CIE-LCH	lch(27.19, 54.16, 292.67°)
OKLab	oklab(37.99% -0.0159 -0.1444)
OKLCH	oklch(37.99% 0.145 263.7)
XYZ	xyz(6.7471, 5.1604, 26.2264)
Luminance	0.0516 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A8E #8E6B17

analogous

#17758E #173A8E #30178E

triadic

#173A8E #8E173A #3A8E17

tetradic

#173A8E #8E1775 #8E6B17 #178E30

square

#173A8E #8E1775 #8E6B17 #178E30

split-complementary

#173A8E #8E3017 #758E17

monochromatic

#060F25 #0E2459 #173A8E #2050C3 #3F6FE0

Accessibility & contrast

On white

10.33

#173A8E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#173A8E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A8E

10.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A8E	#FFFFFF	#000000	##FFFFFF
##173A8E	1.00	10.33	2.03	10.33
#FFFFFF	10.33	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004691

Deuteranopia (green-blind)

#003B8C

Tritanopia (blue-blind)

#004F5E

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #173a8e;
/* rgb */ color: rgb(23, 58, 142);
/* oklch */ color: oklch(38.0% 0.145 263.7);

Tailwind

colors: {
  custom: {
    50: '#6a6fb0',
    500: '#173a8e',
    950: '#000000',
  },
}

SCSS

$custom: #173a8e;
$custom-light: #6a6fb0;
$custom-dark: #000000;

JSON

{
  "hex": "#173a8e",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 142
  },
  "hsl": {
    "h": 222.353,
    "s": 72.121,
    "l": 32.353
  },
  "oklch": {
    "l": 0.37986,
    "c": 0.14531,
    "h": 263.7
  },
  "luminance": 0.05161
}

Semantic roles & 50–950 ramp

primary

#173A8E

secondary

#C09B40

accent

#B939EF

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #173A8E

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

Preview Lab → · Contrast checker → · Palette generator →