#173381#173381

#173381 is a dark, vivid blue. Relative luminance 0.041; OKLCH L 35.3% C 0.136 H 265.0°. Best body text is #FFFFFF at 11.49:1 contrast (WCAG AA passes).

Color values

HEX	#173381
RGB	rgb(23, 51, 129)
HSL	hsl(224, 70%, 30%)
HSV	hsv(224, 82%, 51%)
CMYK	cmyk(82.2%, 60.5%, 0%, 49.4%)
CIE-LAB	lab(24.11, 20.49, -46.90)
CIE-LCH	lch(24.11, 51.18, 293.60°)
OKLab	oklab(35.33% -0.0119 -0.1355)
OKLCH	oklch(35.33% 0.136 265)
XYZ	xyz(5.4982, 4.1341, 21.2728)
Luminance	0.0413 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173381 #816517

analogous

#176881 #173381 #301781

triadic

#173381 #811733 #338117

tetradic

#173381 #811768 #816517 #178130

square

#173381 #811768 #816517 #178130

split-complementary

#173381 #813017 #688117

monochromatic

#050A1A #0E1E4D #173381 #2048B5 #3762DB

Accessibility & contrast

On white

11.49

#173381 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.83

#173381 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173381

11.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173381	#FFFFFF	#000000	##FFFFFF
##173381	1.00	11.49	1.83	11.49
#FFFFFF	11.49	1.00	21.00	1.00
#000000	1.83	21.00	1.00	21.00
##FFFFFF	11.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003E84

Deuteranopia (green-blind)

#00357F

Tritanopia (blue-blind)

#004754

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #173381;
/* rgb */ color: rgb(23, 51, 129);
/* oklch */ color: oklch(35.3% 0.136 265.0);

Tailwind

colors: {
  custom: {
    50: '#676aa6',
    500: '#173381',
    950: '#000000',
  },
}

SCSS

$custom: #173381;
$custom-light: #676aa6;
$custom-dark: #000000;

JSON

{
  "hex": "#173381",
  "rgb": {
    "r": 23,
    "g": 51,
    "b": 129
  },
  "hsl": {
    "h": 224.151,
    "s": 69.737,
    "l": 29.804
  },
  "oklch": {
    "l": 0.35333,
    "c": 0.13603,
    "h": 265
  },
  "luminance": 0.04135
}

Semantic roles & 50–950 ramp

primary

#173381

secondary

#B5963E

accent

#BE3BED

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #173381

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

Preview Lab → · Contrast checker → · Palette generator →