#173DB4#173DB4

#173DB4 is a dark, vivid blue. Relative luminance 0.068; OKLCH L 42.1% C 0.192 H 264.9°. Best body text is #FFFFFF at 8.89:1 contrast (WCAG AA passes).

Color values

HEX	#173DB4
RGB	rgb(23, 61, 180)
HSL	hsl(225, 77%, 40%)
HSV	hsv(225, 87%, 71%)
CMYK	cmyk(87.2%, 66.1%, 0%, 29.4%)
CIE-LAB	lab(31.38, 33.83, -66.12)
CIE-LCH	lch(31.38, 74.27, 297.10°)
OKLab	oklab(42.15% -0.017 -0.1916)
OKLCH	oklch(42.15% 0.192 264.9)
XYZ	xyz(10.2574, 6.8136, 43.9457)
Luminance	0.0682 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173DB4 #B48E17

analogous

#178BB4 #173DB4 #4017B4

triadic

#173DB4 #B4173D #3DB417

tetradic

#173DB4 #B4178B #B48E17 #17B440

square

#173DB4 #B4178B #B48E17 #17B440

split-complementary

#173DB4 #B44017 #8BB417

monochromatic

#091847 #102B7E #173DB4 #2553E3 #5B7EEA

Accessibility & contrast

On white

8.89

#173DB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.36

#173DB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173DB4

8.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173DB4	#FFFFFF	#000000	##FFFFFF
##173DB4	1.00	8.89	2.36	8.89
#FFFFFF	8.89	1.00	21.00	1.00
#000000	2.36	21.00	1.00	21.00
##FFFFFF	8.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051B8

Deuteranopia (green-blind)

#0043B2

Tritanopia (blue-blind)

#005D73

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #173db4;
/* rgb */ color: rgb(23, 61, 180);
/* oklch */ color: oklch(42.1% 0.192 264.9);

Tailwind

colors: {
  custom: {
    50: '#7572cc',
    500: '#173db4',
    950: '#000000',
  },
}

SCSS

$custom: #173db4;
$custom-light: #7572cc;
$custom-dark: #000000;

JSON

{
  "hex": "#173db4",
  "rgb": {
    "r": 23,
    "g": 61,
    "b": 180
  },
  "hsl": {
    "h": 225.478,
    "s": 77.34,
    "l": 39.804
  },
  "oklch": {
    "l": 0.42146,
    "c": 0.19241,
    "h": 264.9
  },
  "luminance": 0.06815
}

Semantic roles & 50–950 ramp

primary

#173DB4

secondary

#CEB159

accent

#C534F4

background

#F7F6FC

surface

#EEECF9

border

#C9C7D2

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #173DB4

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

Preview Lab → · Contrast checker → · Palette generator →