#173A81#173A81

#173A81 is a dark, vivid blue. Relative luminance 0.048; OKLCH L 36.9% C 0.127 H 262.3°. Best body text is #FFFFFF at 10.72:1 contrast (WCAG AA passes).

Color values

HEX	#173A81
RGB	rgb(23, 58, 129)
HSL	hsl(220, 70%, 30%)
HSV	hsv(220, 82%, 51%)
CMYK	cmyk(82.2%, 55%, 0%, 49.4%)
CIE-LAB	lab(26.14, 15.54, -43.60)
CIE-LCH	lch(26.14, 46.29, 289.62°)
OKLab	oklab(36.86% -0.0169 -0.1257)
OKLCH	oklch(36.86% 0.127 262.3)
XYZ	xyz(5.8274, 4.7926, 21.3825)
Luminance	0.0479 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A81 #815E17

analogous

#176F81 #173A81 #291781

triadic

#173A81 #81173A #3A8117

tetradic

#173A81 #81176F #815E17 #178129

square

#173A81 #81176F #815E17 #178129

split-complementary

#173A81 #812917 #6F8117

monochromatic

#050C1A #0E234D #173A81 #2051B5 #376DDB

Accessibility & contrast

On white

10.72

#173A81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#173A81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A81

10.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A81	#FFFFFF	#000000	##FFFFFF
##173A81	1.00	10.72	1.96	10.72
#FFFFFF	10.72	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#034384

Deuteranopia (green-blind)

#003980

Tritanopia (blue-blind)

#004B57

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #173a81;
/* rgb */ color: rgb(23, 58, 129);
/* oklch */ color: oklch(36.9% 0.127 262.3);

Tailwind

colors: {
  custom: {
    50: '#676fa6',
    500: '#173a81',
    950: '#000000',
  },
}

SCSS

$custom: #173a81;
$custom-light: #676fa6;
$custom-dark: #000000;

JSON

{
  "hex": "#173a81",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 129
  },
  "hsl": {
    "h": 220.189,
    "s": 69.737,
    "l": 29.804
  },
  "oklch": {
    "l": 0.36861,
    "c": 0.12685,
    "h": 262.3
  },
  "luminance": 0.04793
}

Semantic roles & 50–950 ramp

primary

#173A81

secondary

#B58E3E

accent

#B23BED

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173A81

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

Preview Lab → · Contrast checker → · Palette generator →