#173F7A#173F7A

#173F7A is a dark, moderate blue. Relative luminance 0.051; OKLCH L 37.5% C 0.110 H 258.4°. Best body text is #FFFFFF at 10.35:1 contrast (WCAG AA passes).

Color values

HEX	#173F7A
RGB	rgb(23, 63, 122)
HSL	hsl(216, 68%, 28%)
HSV	hsv(216, 81%, 48%)
CMYK	cmyk(81.1%, 48.4%, 0%, 52.2%)
CIE-LAB	lab(27.13, 9.12, -37.59)
CIE-LCH	lch(27.13, 38.69, 283.64°)
OKLab	oklab(37.46% -0.0221 -0.1079)
OKLCH	oklch(37.46% 0.11 258.4)
XYZ	xyz(5.6424, 5.1417, 19.1036)
Luminance	0.0514 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F7A #7A5217

analogous

#17707A #173F7A #21177A

triadic

#173F7A #7A173F #3F7A17

tetradic

#173F7A #7A1770 #7A5217 #177A21

square

#173F7A #7A1770 #7A5217 #177A21

split-complementary

#173F7A #7A2117 #707A17

monochromatic

#050D1A #0D2447 #173F7A #215AAD #3376D9

Accessibility & contrast

On white

10.35

#173F7A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#173F7A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F7A

10.35:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F7A	#FFFFFF	#000000	##FFFFFF
##173F7A	1.00	10.35	2.03	10.35
#FFFFFF	10.35	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.35	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1F457C

Deuteranopia (green-blind)

#053C79

Tritanopia (blue-blind)

#004D56

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #173f7a;
/* rgb */ color: rgb(23, 63, 122);
/* oklch */ color: oklch(37.5% 0.110 258.4);

Tailwind

colors: {
  custom: {
    50: '#6573a1',
    500: '#173f7a',
    950: '#000000',
  },
}

SCSS

$custom: #173f7a;
$custom-light: #6573a1;
$custom-dark: #000000;

JSON

{
  "hex": "#173f7a",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 122
  },
  "hsl": {
    "h": 215.758,
    "s": 68.276,
    "l": 28.431
  },
  "oklch": {
    "l": 0.37462,
    "c": 0.11016,
    "h": 258.4
  },
  "luminance": 0.05142
}

Semantic roles & 50–950 ramp

primary

#173F7A

secondary

#AF813E

accent

#A53DEB

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06080F

muted

#7A7B7E

Preview Lab

Preview with #173F7A

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

Preview Lab → · Contrast checker → · Palette generator →