#173F7C#173F7C

#173F7C is a dark, moderate blue. Relative luminance 0.052; OKLCH L 37.6% C 0.113 H 258.9°. Best body text is #FFFFFF at 10.30:1 contrast (WCAG AA passes).

Color values

HEX	#173F7C
RGB	rgb(23, 63, 124)
HSL	hsl(216, 69%, 29%)
HSV	hsv(216, 81%, 49%)
CMYK	cmyk(81.5%, 49.2%, 0%, 51.4%)
CIE-LAB	lab(27.27, 9.96, -38.63)
CIE-LCH	lch(27.27, 39.89, 284.45°)
OKLab	oklab(37.61% -0.0217 -0.111)
OKLCH	oklch(37.61% 0.113 258.9)
XYZ	xyz(5.7676, 5.1917, 19.7630)
Luminance	0.0519 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F7C #7C5417

analogous

#17727C #173F7C #22177C

triadic

#173F7C #7C173F #3F7C17

tetradic

#173F7C #7C1772 #7C5417 #177C22

square

#173F7C #7C1772 #7C5417 #177C22

split-complementary

#173F7C #7C2217 #727C17

monochromatic

#050D1A #0D2548 #173F7C #2159B0 #3476D9

Accessibility & contrast

On white

10.30

#173F7C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#173F7C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F7C

10.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F7C	#FFFFFF	#000000	##FFFFFF
##173F7C	1.00	10.30	2.04	10.30
#FFFFFF	10.30	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1D457E

Deuteranopia (green-blind)

#003C7B

Tritanopia (blue-blind)

#004E57

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #173f7c;
/* rgb */ color: rgb(23, 63, 124);
/* oklch */ color: oklch(37.6% 0.113 258.9);

Tailwind

colors: {
  custom: {
    50: '#6573a2',
    500: '#173f7c',
    950: '#000000',
  },
}

SCSS

$custom: #173f7c;
$custom-light: #6573a2;
$custom-dark: #000000;

JSON

{
  "hex": "#173f7c",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 124
  },
  "hsl": {
    "h": 216.238,
    "s": 68.707,
    "l": 28.824
  },
  "oklch": {
    "l": 0.37614,
    "c": 0.11307,
    "h": 258.9
  },
  "luminance": 0.05192
}

Semantic roles & 50–950 ramp

primary

#173F7C

secondary

#B1833E

accent

#A63CEC

background

#F6F6FA

surface

#EBECF3

border

#C6C7CD

text

#06080F

muted

#7A7B7F

Preview Lab

Preview with #173F7C

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

Preview Lab → · Contrast checker → · Palette generator →