#173A73#173A73

#173A73 is a dark, moderate blue. Relative luminance 0.044; OKLCH L 35.7% C 0.106 H 259.8°. Best body text is #FFFFFF at 11.12:1 contrast (WCAG AA passes).

Color values

HEX	#173A73
RGB	rgb(23, 58, 115)
HSL	hsl(217, 67%, 27%)
HSV	hsv(217, 80%, 45%)
CMYK	cmyk(80%, 49.6%, 0%, 54.9%)
CIE-LAB	lab(25.09, 9.72, -36.45)
CIE-LCH	lch(25.09, 37.72, 284.93°)
OKLab	oklab(35.73% -0.0189 -0.1046)
OKLCH	oklch(35.73% 0.106 259.8)
XYZ	xyz(4.9598, 4.4455, 16.8130)
Luminance	0.0445 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A73 #735017

analogous

#176873 #173A73 #221773

triadic

#173A73 #73173A #3A7317

tetradic

#173A73 #731768 #735017 #177322

square

#173A73 #731768 #735017 #177322

split-complementary

#173A73 #732217 #687317

monochromatic

#050D1A #0D2040 #173A73 #2154A6 #2F6ED5

Accessibility & contrast

On white

11.12

#173A73 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#173A73 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A73

11.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A73	#FFFFFF	#000000	##FFFFFF
##173A73	1.00	11.12	1.89	11.12
#FFFFFF	11.12	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.12	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1B4075

Deuteranopia (green-blind)

#023872

Tritanopia (blue-blind)

#004851

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #173a73;
/* rgb */ color: rgb(23, 58, 115);
/* oklch */ color: oklch(35.7% 0.106 259.8);

Tailwind

colors: {
  custom: {
    50: '#636f9c',
    500: '#173a73',
    950: '#000000',
  },
}

SCSS

$custom: #173a73;
$custom-light: #636f9c;
$custom-dark: #000000;

JSON

{
  "hex": "#173a73",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 115
  },
  "hsl": {
    "h": 217.174,
    "s": 66.667,
    "l": 27.059
  },
  "oklch": {
    "l": 0.35732,
    "c": 0.10634,
    "h": 259.8
  },
  "luminance": 0.04446
}

Semantic roles & 50–950 ramp

primary

#173A73

secondary

#A9803D

accent

#A83EEA

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #173A73

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

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