#173EA0#173EA0

#173EA0 is a dark, vivid blue. Relative luminance 0.062; OKLCH L 40.4% C 0.165 H 263.9°. Best body text is #FFFFFF at 9.40:1 contrast (WCAG AA passes).

Color values

HEX	#173EA0
RGB	rgb(23, 62, 160)
HSL	hsl(223, 75%, 36%)
HSV	hsv(223, 86%, 63%)
CMYK	cmyk(85.6%, 61.2%, 0%, 37.3%)
CIE-LAB	lab(29.82, 25.37, -56.68)
CIE-LCH	lch(29.82, 62.09, 294.11°)
OKLab	oklab(40.44% -0.0175 -0.164)
OKLCH	oklch(40.44% 0.165 263.9)
XYZ	xyz(8.4189, 6.1644, 33.9970)
Luminance	0.0617 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173EA0 #A07917

analogous

#1782A0 #173EA0 #3517A0

triadic

#173EA0 #A0173E #3EA017

tetradic

#173EA0 #A01782 #A07917 #17A035

square

#173EA0 #A01782 #A07917 #17A035

split-complementary

#173EA0 #A03517 #82A017

monochromatic

#081535 #0F296A #173EA0 #1F53D6 #4C78E5

Accessibility & contrast

On white

9.40

#173EA0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#173EA0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173EA0

9.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173EA0	#FFFFFF	#000000	##FFFFFF
##173EA0	1.00	9.40	2.23	9.40
#FFFFFF	9.40	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DA3

Deuteranopia (green-blind)

#00409E

Tritanopia (blue-blind)

#005769

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #173ea0;
/* rgb */ color: rgb(23, 62, 160);
/* oklch */ color: oklch(40.4% 0.165 263.9);

Tailwind

colors: {
  custom: {
    50: '#6f72bd',
    500: '#173ea0',
    950: '#000000',
  },
}

SCSS

$custom: #173ea0;
$custom-light: #6f72bd;
$custom-dark: #000000;

JSON

{
  "hex": "#173ea0",
  "rgb": {
    "r": 23,
    "g": 62,
    "b": 160
  },
  "hsl": {
    "h": 222.92,
    "s": 74.863,
    "l": 35.882
  },
  "oklch": {
    "l": 0.40438,
    "c": 0.16495,
    "h": 263.9
  },
  "luminance": 0.06165
}

Semantic roles & 50–950 ramp

primary

#173EA0

secondary

#C7A44C

accent

#BC36F1

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #173EA0

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

Preview Lab → · Contrast checker → · Palette generator →