#173781#173781

#173781 is a dark, vivid blue. Relative luminance 0.045; OKLCH L 36.2% C 0.131 H 263.6°. Best body text is #FFFFFF at 11.05:1 contrast (WCAG AA passes).

Color values

HEX	#173781
RGB	rgb(23, 55, 129)
HSL	hsl(222, 70%, 30%)
HSV	hsv(222, 82%, 51%)
CMYK	cmyk(82.2%, 57.4%, 0%, 49.4%)
CIE-LAB	lab(25.26, 17.66, -45.03)
CIE-LCH	lch(25.26, 48.37, 291.41°)
OKLab	oklab(36.2% -0.0147 -0.13)
OKLCH	oklch(36.2% 0.131 263.6)
XYZ	xyz(5.6806, 4.4988, 21.3336)
Luminance	0.0450 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173781 #816117

analogous

#176C81 #173781 #2C1781

triadic

#173781 #811737 #378117

tetradic

#173781 #81176C #816117 #17812C

square

#173781 #81176C #816117 #17812C

split-complementary

#173781 #812C17 #6C8117

monochromatic

#050B1A #0E214D #173781 #204DB5 #3769DB

Accessibility & contrast

On white

11.05

#173781 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#173781 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173781

11.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173781	#FFFFFF	#000000	##FFFFFF
##173781	1.00	11.05	1.90	11.05
#FFFFFF	11.05	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.05	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004184

Deuteranopia (green-blind)

#003780

Tritanopia (blue-blind)

#004956

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #173781;
/* rgb */ color: rgb(23, 55, 129);
/* oklch */ color: oklch(36.2% 0.131 263.6);

Tailwind

colors: {
  custom: {
    50: '#676da6',
    500: '#173781',
    950: '#000000',
  },
}

SCSS

$custom: #173781;
$custom-light: #676da6;
$custom-dark: #000000;

JSON

{
  "hex": "#173781",
  "rgb": {
    "r": 23,
    "g": 55,
    "b": 129
  },
  "hsl": {
    "h": 221.887,
    "s": 69.737,
    "l": 29.804
  },
  "oklch": {
    "l": 0.36196,
    "c": 0.13079,
    "h": 263.6
  },
  "luminance": 0.045
}

Semantic roles & 50–950 ramp

primary

#173781

secondary

#B5913E

accent

#B73BED

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173781

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

Preview Lab → · Contrast checker → · Palette generator →