#173A80#173A80

#173A80 is a dark, vivid blue. Relative luminance 0.048; OKLCH L 36.8% C 0.125 H 262.2°. Best body text is #FFFFFF at 10.75:1 contrast (WCAG AA passes).

Color values

HEX	#173A80
RGB	rgb(23, 58, 128)
HSL	hsl(220, 70%, 30%)
HSV	hsv(220, 82%, 50%)
CMYK	cmyk(82%, 54.7%, 0%, 49.8%)
CIE-LAB	lab(26.06, 15.13, -43.10)
CIE-LCH	lch(26.06, 45.68, 289.34°)
OKLab	oklab(36.78% -0.017 -0.1242)
OKLCH	oklch(36.78% 0.125 262.2)
XYZ	xyz(5.7613, 4.7661, 21.0342)
Luminance	0.0477 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A80 #805D17

analogous

#176F80 #173A80 #291780

triadic

#173A80 #80173A #3A8017

tetradic

#173A80 #80176F #805D17 #178029

square

#173A80 #80176F #805D17 #178029

split-complementary

#173A80 #802917 #6F8017

monochromatic

#050C1A #0E224C #173A80 #2052B4 #366DDB

Accessibility & contrast

On white

10.75

#173A80 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#173A80 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A80

10.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A80	#FFFFFF	#000000	##FFFFFF
##173A80	1.00	10.75	1.95	10.75
#FFFFFF	10.75	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#054382

Deuteranopia (green-blind)

#00397F

Tritanopia (blue-blind)

#004B57

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #173a80;
/* rgb */ color: rgb(23, 58, 128);
/* oklch */ color: oklch(36.8% 0.125 262.2);

Tailwind

colors: {
  custom: {
    50: '#676fa5',
    500: '#173a80',
    950: '#000000',
  },
}

SCSS

$custom: #173a80;
$custom-light: #676fa5;
$custom-dark: #000000;

JSON

{
  "hex": "#173a80",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 128
  },
  "hsl": {
    "h": 220,
    "s": 69.536,
    "l": 29.608
  },
  "oklch": {
    "l": 0.36778,
    "c": 0.12539,
    "h": 262.2
  },
  "luminance": 0.04767
}

Semantic roles & 50–950 ramp

primary

#173A80

secondary

#B48D3E

accent

#B13BEC

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173A80

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

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