#173E81#173E81

#173E81 is a dark, vivid blue. Relative luminance 0.052; OKLCH L 37.8% C 0.122 H 260.5°. Best body text is #FFFFFF at 10.28:1 contrast (WCAG AA passes).

Color values

HEX	#173E81
RGB	rgb(23, 62, 129)
HSL	hsl(218, 70%, 30%)
HSV	hsv(218, 82%, 51%)
CMYK	cmyk(82.2%, 51.9%, 0%, 49.4%)
CIE-LAB	lab(27.33, 12.73, -41.67)
CIE-LCH	lch(27.33, 43.57, 286.99°)
OKLab	oklab(37.77% -0.0201 -0.1199)
OKLCH	oklch(37.77% 0.122 260.5)
XYZ	xyz(6.0370, 5.2117, 21.4524)
Luminance	0.0521 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173E81 #815A17

analogous

#177381 #173E81 #251781

triadic

#173E81 #81173E #3E8117

tetradic

#173E81 #811773 #815A17 #178125

square

#173E81 #811773 #815A17 #178125

split-complementary

#173E81 #812517 #738117

monochromatic

#050C1A #0E254D #173E81 #2057B5 #3773DB

Accessibility & contrast

On white

10.28

#173E81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#173E81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173E81

10.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173E81	#FFFFFF	#000000	##FFFFFF
##173E81	1.00	10.28	2.04	10.28
#FFFFFF	10.28	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#144683

Deuteranopia (green-blind)

#003C80

Tritanopia (blue-blind)

#004E59

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #173e81;
/* rgb */ color: rgb(23, 62, 129);
/* oklch */ color: oklch(37.8% 0.122 260.5);

Tailwind

colors: {
  custom: {
    50: '#6772a6',
    500: '#173e81',
    950: '#000000',
  },
}

SCSS

$custom: #173e81;
$custom-light: #6772a6;
$custom-dark: #000000;

JSON

{
  "hex": "#173e81",
  "rgb": {
    "r": 23,
    "g": 62,
    "b": 129
  },
  "hsl": {
    "h": 217.925,
    "s": 69.737,
    "l": 29.804
  },
  "oklch": {
    "l": 0.37771,
    "c": 0.12161,
    "h": 260.5
  },
  "luminance": 0.05212
}

Semantic roles & 50–950 ramp

primary

#173E81

secondary

#B58A3E

accent

#AB3BED

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173E81

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

Preview Lab → · Contrast checker → · Palette generator →