#173D88#173D88

#173D88 is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.1% C 0.133 H 262.0°. Best body text is #FFFFFF at 10.20:1 contrast (WCAG AA passes).

Color values

HEX	#173D88
RGB	rgb(23, 61, 136)
HSL	hsl(220, 71%, 31%)
HSV	hsv(220, 83%, 53%)
CMYK	cmyk(83.1%, 55.1%, 0%, 46.7%)
CIE-LAB	lab(27.56, 16.32, -45.65)
CIE-LCH	lch(27.56, 48.48, 289.68°)
OKLab	oklab(38.12% -0.0184 -0.1317)
OKLCH	oklch(38.12% 0.133 262)
XYZ	xyz(6.4644, 5.2964, 23.9694)
Luminance	0.0530 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173D88 #886217

analogous

#177588 #173D88 #291788

triadic

#173D88 #88173D #3D8817

tetradic

#173D88 #881775 #886217 #178829

square

#173D88 #881775 #886217 #178829

split-complementary

#173D88 #882917 #758817

monochromatic

#050E1F #0E2654 #173D88 #2054BC #3B72DE

Accessibility & contrast

On white

10.20

#173D88 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.06

#173D88 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173D88

10.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173D88	#FFFFFF	#000000	##FFFFFF
##173D88	1.00	10.20	2.06	10.20
#FFFFFF	10.20	1.00	21.00	1.00
#000000	2.06	21.00	1.00	21.00
##FFFFFF	10.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00468B

Deuteranopia (green-blind)

#003C87

Tritanopia (blue-blind)

#004F5C

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #173d88;
/* rgb */ color: rgb(23, 61, 136);
/* oklch */ color: oklch(38.1% 0.133 262.0);

Tailwind

colors: {
  custom: {
    50: '#6971ab',
    500: '#173d88',
    950: '#000000',
  },
}

SCSS

$custom: #173d88;
$custom-light: #6971ab;
$custom-dark: #000000;

JSON

{
  "hex": "#173d88",
  "rgb": {
    "r": 23,
    "g": 61,
    "b": 136
  },
  "hsl": {
    "h": 219.823,
    "s": 71.069,
    "l": 31.176
  },
  "oklch": {
    "l": 0.38118,
    "c": 0.13295,
    "h": 262
  },
  "luminance": 0.05297
}

Semantic roles & 50–950 ramp

primary

#173D88

secondary

#BC923F

accent

#B13AEE

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #173D88

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

Preview Lab → · Contrast checker → · Palette generator →