#173971#173971

#173971 is a dark, moderate blue. Relative luminance 0.043; OKLCH L 35.3% C 0.105 H 259.9°. Best body text is #FFFFFF at 11.29:1 contrast (WCAG AA passes).

Color values

HEX	#173971
RGB	rgb(23, 57, 113)
HSL	hsl(217, 66%, 27%)
HSV	hsv(217, 80%, 44%)
CMYK	cmyk(79.6%, 49.6%, 0%, 55.7%)
CIE-LAB	lab(24.64, 9.59, -35.90)
CIE-LCH	lch(24.64, 37.16, 284.96°)
OKLab	oklab(35.34% -0.0184 -0.1031)
OKLCH	oklch(35.34% 0.105 259.9)
XYZ	xyz(4.7960, 4.3001, 16.1968)
Luminance	0.0430 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173971 #714F17

analogous

#176671 #173971 #221771

triadic

#173971 #711739 #397117

tetradic

#173971 #711766 #714F17 #177122

square

#173971 #711766 #714F17 #177122

split-complementary

#173971 #712217 #667117

monochromatic

#050D19 #0D1F3E #173971 #2153A4 #2E6DD4

Accessibility & contrast

On white

11.29

#173971 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#173971 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173971

11.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173971	#FFFFFF	#000000	##FFFFFF
##173971	1.00	11.29	1.86	11.29
#FFFFFF	11.29	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1A3F73

Deuteranopia (green-blind)

#023770

Tritanopia (blue-blind)

#00464F

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #173971;
/* rgb */ color: rgb(23, 57, 113);
/* oklch */ color: oklch(35.3% 0.105 259.9);

Tailwind

colors: {
  custom: {
    50: '#636e9a',
    500: '#173971',
    950: '#000000',
  },
}

SCSS

$custom: #173971;
$custom-light: #636e9a;
$custom-dark: #000000;

JSON

{
  "hex": "#173971",
  "rgb": {
    "r": 23,
    "g": 57,
    "b": 113
  },
  "hsl": {
    "h": 217.333,
    "s": 66.176,
    "l": 26.667
  },
  "oklch": {
    "l": 0.35339,
    "c": 0.10469,
    "h": 259.9
  },
  "luminance": 0.04301
}

Semantic roles & 50–950 ramp

primary

#173971

secondary

#A77F3D

accent

#A93FE9

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #173971

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

Preview Lab → · Contrast checker → · Palette generator →