#173F81#173F81

#173F81 is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.0% C 0.120 H 260.0°. Best body text is #FFFFFF at 10.17:1 contrast (WCAG AA passes).

Color values

HEX	#173F81
RGB	rgb(23, 63, 129)
HSL	hsl(217, 70%, 30%)
HSV	hsv(217, 82%, 51%)
CMYK	cmyk(82.2%, 51.2%, 0%, 49.4%)
CIE-LAB	lab(27.63, 12.03, -41.18)
CIE-LCH	lch(27.63, 42.91, 286.28°)
OKLab	oklab(38% -0.0209 -0.1185)
OKLCH	oklch(38% 0.12 260)
XYZ	xyz(6.0919, 5.3214, 21.4707)
Luminance	0.0532 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F81 #815917

analogous

#177481 #173F81 #241781

triadic

#173F81 #81173F #3F8117

tetradic

#173F81 #811774 #815917 #178124

square

#173F81 #811774 #815917 #178124

split-complementary

#173F81 #812417 #748117

monochromatic

#050D1A #0E264D #173F81 #2058B5 #3775DB

Accessibility & contrast

On white

10.17

#173F81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.06

#173F81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F81

10.17:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F81	#FFFFFF	#000000	##FFFFFF
##173F81	1.00	10.17	2.06	10.17
#FFFFFF	10.17	1.00	21.00	1.00
#000000	2.06	21.00	1.00	21.00
##FFFFFF	10.17	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#174683

Deuteranopia (green-blind)

#003D80

Tritanopia (blue-blind)

#004F5A

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #173f81;
/* rgb */ color: rgb(23, 63, 129);
/* oklch */ color: oklch(38.0% 0.120 260.0);

Tailwind

colors: {
  custom: {
    50: '#6773a6',
    500: '#173f81',
    950: '#000000',
  },
}

SCSS

$custom: #173f81;
$custom-light: #6773a6;
$custom-dark: #000000;

JSON

{
  "hex": "#173f81",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 129
  },
  "hsl": {
    "h": 217.358,
    "s": 69.737,
    "l": 29.804
  },
  "oklch": {
    "l": 0.38003,
    "c": 0.12031,
    "h": 260
  },
  "luminance": 0.05322
}

Semantic roles & 50–950 ramp

primary

#173F81

secondary

#B5883E

accent

#AA3BED

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #173F81

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

Preview Lab → · Contrast checker → · Palette generator →