#173F80#173F80

#173F80 is a dark, moderate blue. Relative luminance 0.053; OKLCH L 37.9% C 0.119 H 259.8°. Best body text is #FFFFFF at 10.20:1 contrast (WCAG AA passes).

Color values

HEX	#173F80
RGB	rgb(23, 63, 128)
HSL	hsl(217, 70%, 30%)
HSV	hsv(217, 82%, 50%)
CMYK	cmyk(82%, 50.8%, 0%, 49.8%)
CIE-LAB	lab(27.56, 11.61, -40.68)
CIE-LCH	lch(27.56, 42.30, 285.94°)
OKLab	oklab(37.92% -0.021 -0.117)
OKLCH	oklch(37.92% 0.119 259.8)
XYZ	xyz(6.0257, 5.2950, 21.1223)
Luminance	0.0530 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F80 #805817

analogous

#177480 #173F80 #241780

triadic

#173F80 #80173F #3F8017

tetradic

#173F80 #801774 #805817 #178024

square

#173F80 #801774 #805817 #178024

split-complementary

#173F80 #802417 #748017

monochromatic

#050D1A #0E254C #173F80 #2059B4 #3675DB

Accessibility & contrast

On white

10.20

#173F80 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.06

#173F80 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F80

10.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F80	#FFFFFF	#000000	##FFFFFF
##173F80	1.00	10.20	2.06	10.20
#FFFFFF	10.20	1.00	21.00	1.00
#000000	2.06	21.00	1.00	21.00
##FFFFFF	10.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#184682

Deuteranopia (green-blind)

#003D7F

Tritanopia (blue-blind)

#004F59

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #173f80;
/* rgb */ color: rgb(23, 63, 128);
/* oklch */ color: oklch(37.9% 0.119 259.8);

Tailwind

colors: {
  custom: {
    50: '#6673a5',
    500: '#173f80',
    950: '#000000',
  },
}

SCSS

$custom: #173f80;
$custom-light: #6673a5;
$custom-dark: #000000;

JSON

{
  "hex": "#173f80",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 128
  },
  "hsl": {
    "h": 217.143,
    "s": 69.536,
    "l": 29.608
  },
  "oklch": {
    "l": 0.37924,
    "c": 0.11887,
    "h": 259.8
  },
  "luminance": 0.05296
}

Semantic roles & 50–950 ramp

primary

#173F80

secondary

#B4873E

accent

#A93BEC

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #173F80

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

Preview Lab → · Contrast checker → · Palette generator →