#173D9F#173D9F

#173D9F is a dark, vivid blue. Relative luminance 0.060; OKLCH L 40.1% C 0.165 H 264.1°. Best body text is #FFFFFF at 9.53:1 contrast (WCAG AA passes).

Color values

HEX	#173D9F
RGB	rgb(23, 61, 159)
HSL	hsl(223, 75%, 36%)
HSV	hsv(223, 86%, 62%)
CMYK	cmyk(85.5%, 61.6%, 0%, 37.6%)
CIE-LAB	lab(29.47, 25.65, -56.65)
CIE-LCH	lch(29.47, 62.19, 294.36°)
OKLab	oklab(40.15% -0.017 -0.164)
OKLCH	oklch(40.15% 0.165 264.1)
XYZ	xyz(8.2779, 6.0218, 33.5202)
Luminance	0.0602 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173D9F #9F7917

analogous

#17819F #173D9F #35179F

triadic

#173D9F #9F173D #3D9F17

tetradic

#173D9F #9F1781 #9F7917 #179F35

square

#173D9F #9F1781 #9F7917 #179F35

split-complementary

#173D9F #9F3517 #819F17

monochromatic

#081434 #0F286A #173D9F #1F52D4 #4B76E5

Accessibility & contrast

On white

9.53

#173D9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.20

#173D9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173D9F

9.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173D9F	#FFFFFF	#000000	##FFFFFF
##173D9F	1.00	9.53	2.20	9.53
#FFFFFF	9.53	1.00	21.00	1.00
#000000	2.20	21.00	1.00	21.00
##FFFFFF	9.53	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004CA2

Deuteranopia (green-blind)

#003F9D

Tritanopia (blue-blind)

#005668

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #173d9f;
/* rgb */ color: rgb(23, 61, 159);
/* oklch */ color: oklch(40.1% 0.165 264.1);

Tailwind

colors: {
  custom: {
    50: '#6f72bc',
    500: '#173d9f',
    950: '#000000',
  },
}

SCSS

$custom: #173d9f;
$custom-light: #6f72bc;
$custom-dark: #000000;

JSON

{
  "hex": "#173d9f",
  "rgb": {
    "r": 23,
    "g": 61,
    "b": 159
  },
  "hsl": {
    "h": 223.235,
    "s": 74.725,
    "l": 35.686
  },
  "oklch": {
    "l": 0.40146,
    "c": 0.16485,
    "h": 264.1
  },
  "luminance": 0.06023
}

Semantic roles & 50–950 ramp

primary

#173D9F

secondary

#C7A44B

accent

#BD36F1

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #173D9F

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

Preview Lab → · Contrast checker → · Palette generator →