#173FB4#173FB4

#173FB4 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 42.5% C 0.190 H 264.6°. Best body text is #FFFFFF at 8.73:1 contrast (WCAG AA passes).

Color values

HEX	#173FB4
RGB	rgb(23, 63, 180)
HSL	hsl(225, 77%, 40%)
HSV	hsv(225, 87%, 71%)
CMYK	cmyk(87.2%, 65%, 0%, 29.4%)
CIE-LAB	lab(31.88, 32.52, -65.30)
CIE-LCH	lch(31.88, 72.95, 296.48°)
OKLab	oklab(42.51% -0.0179 -0.1892)
OKLCH	oklch(42.51% 0.19 264.6)
XYZ	xyz(10.3662, 7.0311, 43.9820)
Luminance	0.0703 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173FB4 #B48C17

analogous

#178EB4 #173FB4 #3D17B4

triadic

#173FB4 #B4173F #3FB417

tetradic

#173FB4 #B4178E #B48C17 #17B43D

square

#173FB4 #B4178E #B48C17 #17B43D

split-complementary

#173FB4 #B43D17 #8EB417

monochromatic

#091947 #102C7E #173FB4 #2555E3 #5B80EA

Accessibility & contrast

On white

8.73

#173FB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.41

#173FB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173FB4

8.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173FB4	#FFFFFF	#000000	##FFFFFF
##173FB4	1.00	8.73	2.41	8.73
#FFFFFF	8.73	1.00	21.00	1.00
#000000	2.41	21.00	1.00	21.00
##FFFFFF	8.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052B8

Deuteranopia (green-blind)

#0044B2

Tritanopia (blue-blind)

#005E74

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #173fb4;
/* rgb */ color: rgb(23, 63, 180);
/* oklch */ color: oklch(42.5% 0.190 264.6);

Tailwind

colors: {
  custom: {
    50: '#7473cc',
    500: '#173fb4',
    950: '#000000',
  },
}

SCSS

$custom: #173fb4;
$custom-light: #7473cc;
$custom-dark: #000000;

JSON

{
  "hex": "#173fb4",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 180
  },
  "hsl": {
    "h": 224.713,
    "s": 77.34,
    "l": 39.804
  },
  "oklch": {
    "l": 0.42514,
    "c": 0.19007,
    "h": 264.6
  },
  "luminance": 0.07032
}

Semantic roles & 50–950 ramp

primary

#173FB4

secondary

#CEB059

accent

#C334F4

background

#F7F7FC

surface

#EEEDF9

border

#C9C8D2

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #173FB4

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

Preview Lab → · Contrast checker → · Palette generator →