#173578#173578

#173578 is a dark, vivid blue. Relative luminance 0.041; OKLCH L 35.0% C 0.120 H 263.3°. Best body text is #FFFFFF at 11.56:1 contrast (WCAG AA passes).

Color values

HEX	#173578
RGB	rgb(23, 53, 120)
HSL	hsl(221, 68%, 28%)
HSV	hsv(221, 81%, 47%)
CMYK	cmyk(80.8%, 55.8%, 0%, 52.9%)
CIE-LAB	lab(23.95, 15.35, -41.48)
CIE-LCH	lch(23.95, 44.23, 290.31°)
OKLab	oklab(34.98% -0.014 -0.1195)
OKLCH	oklch(34.98% 0.12 263.3)
XYZ	xyz(5.0154, 4.0839, 18.2896)
Luminance	0.0408 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173578 #785A17

analogous

#176578 #173578 #291778

triadic

#173578 #781735 #357817

tetradic

#173578 #781765 #785A17 #177829

square

#173578 #781765 #785A17 #177829

split-complementary

#173578 #782917 #657817

monochromatic

#050B1A #0D1E45 #173578 #214CAB #3265D8

Accessibility & contrast

On white

11.56

#173578 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.82

#173578 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173578

11.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173578	#FFFFFF	#000000	##FFFFFF
##173578	1.00	11.56	1.82	11.56
#FFFFFF	11.56	1.00	21.00	1.00
#000000	1.82	21.00	1.00	21.00
##FFFFFF	11.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#013E7A

Deuteranopia (green-blind)

#003577

Tritanopia (blue-blind)

#004551

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #173578;
/* rgb */ color: rgb(23, 53, 120);
/* oklch */ color: oklch(35.0% 0.120 263.3);

Tailwind

colors: {
  custom: {
    50: '#656b9f',
    500: '#173578',
    950: '#000000',
  },
}

SCSS

$custom: #173578;
$custom-light: #656b9f;
$custom-dark: #000000;

JSON

{
  "hex": "#173578",
  "rgb": {
    "r": 23,
    "g": 53,
    "b": 120
  },
  "hsl": {
    "h": 221.443,
    "s": 67.832,
    "l": 28.039
  },
  "oklch": {
    "l": 0.34977,
    "c": 0.12036,
    "h": 263.3
  },
  "luminance": 0.04084
}

Semantic roles & 50–950 ramp

primary

#173578

secondary

#AD8B3E

accent

#B53DEB

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060F

muted

#7A7A7E

Preview Lab

Preview with #173578

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

Preview Lab → · Contrast checker → · Palette generator →