#173A71#173A71

#173A71 is a dark, moderate blue. Relative luminance 0.044; OKLCH L 35.6% C 0.103 H 259.3°. Best body text is #FFFFFF at 11.17:1 contrast (WCAG AA passes).

Color values

HEX	#173A71
RGB	rgb(23, 58, 113)
HSL	hsl(217, 66%, 27%)
HSV	hsv(217, 80%, 44%)
CMYK	cmyk(79.6%, 48.7%, 0%, 55.7%)
CIE-LAB	lab(24.95, 8.89, -35.40)
CIE-LCH	lch(24.95, 36.50, 284.09°)
OKLab	oklab(35.58% -0.0193 -0.1016)
OKLCH	oklch(35.58% 0.103 259.3)
XYZ	xyz(4.8460, 4.4000, 16.2135)
Luminance	0.0440 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A71 #714E17

analogous

#176771 #173A71 #211771

triadic

#173A71 #71173A #3A7117

tetradic

#173A71 #711767 #714E17 #177121

square

#173A71 #711767 #714E17 #177121

split-complementary

#173A71 #712117 #677117

monochromatic

#050D19 #0D203E #173A71 #2154A4 #2E6FD4

Accessibility & contrast

On white

11.17

#173A71 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.88

#173A71 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A71

11.17:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A71	#FFFFFF	#000000	##FFFFFF
##173A71	1.00	11.17	1.88	11.17
#FFFFFF	11.17	1.00	21.00	1.00
#000000	1.88	21.00	1.00	21.00
##FFFFFF	11.17	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1D4073

Deuteranopia (green-blind)

#063770

Tritanopia (blue-blind)

#004750

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #173a71;
/* rgb */ color: rgb(23, 58, 113);
/* oklch */ color: oklch(35.6% 0.103 259.3);

Tailwind

colors: {
  custom: {
    50: '#636f9a',
    500: '#173a71',
    950: '#000000',
  },
}

SCSS

$custom: #173a71;
$custom-light: #636f9a;
$custom-dark: #000000;

JSON

{
  "hex": "#173a71",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 113
  },
  "hsl": {
    "h": 216.667,
    "s": 66.176,
    "l": 26.667
  },
  "oklch": {
    "l": 0.35579,
    "c": 0.10338,
    "h": 259.3
  },
  "luminance": 0.04401
}

Semantic roles & 50–950 ramp

primary

#173A71

secondary

#A77E3D

accent

#A73FE9

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #173A71

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

Preview Lab → · Contrast checker → · Palette generator →