#173D8C#173D8C

#173D8C is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.5% C 0.139 H 262.5°. Best body text is #FFFFFF at 10.08:1 contrast (WCAG AA passes).

Color values

HEX	#173D8C
RGB	rgb(23, 61, 140)
HSL	hsl(221, 72%, 32%)
HSV	hsv(221, 84%, 55%)
CMYK	cmyk(83.6%, 56.4%, 0%, 45.1%)
CIE-LAB	lab(27.88, 17.97, -47.62)
CIE-LCH	lch(27.88, 50.89, 290.67°)
OKLab	oklab(38.46% -0.0181 -0.1374)
OKLCH	oklch(38.46% 0.139 262.5)
XYZ	xyz(6.7540, 5.4123, 25.4946)
Luminance	0.0541 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173D8C #8C6617

analogous

#17788C #173D8C #2C178C

triadic

#173D8C #8C173D #3D8C17

tetradic

#173D8C #8C1778 #8C6617 #178C2C

square

#173D8C #8C1778 #8C6617 #178C2C

split-complementary

#173D8C #8C2C17 #788C17

monochromatic

#060F23 #0E2657 #173D8C #2054C1 #3E72DF

Accessibility & contrast

On white

10.08

#173D8C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#173D8C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173D8C

10.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173D8C	#FFFFFF	#000000	##FFFFFF
##173D8C	1.00	10.08	2.08	10.08
#FFFFFF	10.08	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.08	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478F

Deuteranopia (green-blind)

#003D8A

Tritanopia (blue-blind)

#00515E

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #173d8c;
/* rgb */ color: rgb(23, 61, 140);
/* oklch */ color: oklch(38.5% 0.139 262.5);

Tailwind

colors: {
  custom: {
    50: '#6a71ae',
    500: '#173d8c',
    950: '#000000',
  },
}

SCSS

$custom: #173d8c;
$custom-light: #6a71ae;
$custom-dark: #000000;

JSON

{
  "hex": "#173d8c",
  "rgb": {
    "r": 23,
    "g": 61,
    "b": 140
  },
  "hsl": {
    "h": 220.513,
    "s": 71.779,
    "l": 31.961
  },
  "oklch": {
    "l": 0.38456,
    "c": 0.13863,
    "h": 262.5
  },
  "luminance": 0.05413
}

Semantic roles & 50–950 ramp

primary

#173D8C

secondary

#BF963F

accent

#B439EF

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #173D8C

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

Preview Lab → · Contrast checker → · Palette generator →