#173A72#173A72

#173A72 is a dark, moderate blue. Relative luminance 0.044; OKLCH L 35.7% C 0.105 H 259.5°. Best body text is #FFFFFF at 11.14:1 contrast (WCAG AA passes).

Color values

HEX	#173A72
RGB	rgb(23, 58, 114)
HSL	hsl(217, 66%, 27%)
HSV	hsv(217, 80%, 45%)
CMYK	cmyk(79.8%, 49.1%, 0%, 55.3%)
CIE-LAB	lab(25.02, 9.30, -35.93)
CIE-LCH	lch(25.02, 37.11, 284.52°)
OKLab	oklab(35.66% -0.0191 -0.1031)
OKLCH	oklch(35.66% 0.105 259.5)
XYZ	xyz(4.9026, 4.4226, 16.5116)
Luminance	0.0442 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A72 #724F17

analogous

#176872 #173A72 #221772

triadic

#173A72 #72173A #3A7217

tetradic

#173A72 #721768 #724F17 #177222

square

#173A72 #721768 #724F17 #177222

split-complementary

#173A72 #722217 #687217

monochromatic

#050D19 #0D203F #173A72 #2154A5 #2E6ED5

Accessibility & contrast

On white

11.14

#173A72 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.88

#173A72 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A72

11.14:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A72	#FFFFFF	#000000	##FFFFFF
##173A72	1.00	11.14	1.88	11.14
#FFFFFF	11.14	1.00	21.00	1.00
#000000	1.88	21.00	1.00	21.00
##FFFFFF	11.14	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1C4074

Deuteranopia (green-blind)

#043771

Tritanopia (blue-blind)

#004750

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #173a72;
/* rgb */ color: rgb(23, 58, 114);
/* oklch */ color: oklch(35.7% 0.105 259.5);

Tailwind

colors: {
  custom: {
    50: '#636f9b',
    500: '#173a72',
    950: '#000000',
  },
}

SCSS

$custom: #173a72;
$custom-light: #636f9b;
$custom-dark: #000000;

JSON

{
  "hex": "#173a72",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 114
  },
  "hsl": {
    "h": 216.923,
    "s": 66.423,
    "l": 26.863
  },
  "oklch": {
    "l": 0.35655,
    "c": 0.10486,
    "h": 259.5
  },
  "luminance": 0.04423
}

Semantic roles & 50–950 ramp

primary

#173A72

secondary

#A87F3D

accent

#A83EE9

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #173A72

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

Preview Lab → · Contrast checker → · Palette generator →