#173EB4#173EB4

#173EB4 is a dark, vivid blue. Relative luminance 0.069; OKLCH L 42.3% C 0.191 H 264.8°. Best body text is #FFFFFF at 8.81:1 contrast (WCAG AA passes).

Color values

HEX	#173EB4
RGB	rgb(23, 62, 180)
HSL	hsl(225, 77%, 40%)
HSV	hsv(225, 87%, 71%)
CMYK	cmyk(87.2%, 65.6%, 0%, 29.4%)
CIE-LAB	lab(31.63, 33.18, -65.71)
CIE-LCH	lch(31.63, 73.61, 296.79°)
OKLab	oklab(42.33% -0.0175 -0.1904)
OKLCH	oklch(42.33% 0.191 264.8)
XYZ	xyz(10.3113, 6.9214, 43.9637)
Luminance	0.0692 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173EB4 #B48D17

analogous

#178CB4 #173EB4 #3F17B4

triadic

#173EB4 #B4173E #3EB417

tetradic

#173EB4 #B4178C #B48D17 #17B43F

square

#173EB4 #B4178C #B48D17 #17B43F

split-complementary

#173EB4 #B43F17 #8CB417

monochromatic

#091947 #102B7E #173EB4 #2554E3 #5B7FEA

Accessibility & contrast

On white

8.81

#173EB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.38

#173EB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173EB4

8.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173EB4	#FFFFFF	#000000	##FFFFFF
##173EB4	1.00	8.81	2.38	8.81
#FFFFFF	8.81	1.00	21.00	1.00
#000000	2.38	21.00	1.00	21.00
##FFFFFF	8.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052B8

Deuteranopia (green-blind)

#0043B2

Tritanopia (blue-blind)

#005E73

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #173eb4;
/* rgb */ color: rgb(23, 62, 180);
/* oklch */ color: oklch(42.3% 0.191 264.8);

Tailwind

colors: {
  custom: {
    50: '#7573cc',
    500: '#173eb4',
    950: '#000000',
  },
}

SCSS

$custom: #173eb4;
$custom-light: #7573cc;
$custom-dark: #000000;

JSON

{
  "hex": "#173eb4",
  "rgb": {
    "r": 23,
    "g": 62,
    "b": 180
  },
  "hsl": {
    "h": 225.096,
    "s": 77.34,
    "l": 39.804
  },
  "oklch": {
    "l": 0.42329,
    "c": 0.19124,
    "h": 264.8
  },
  "luminance": 0.06923
}

Semantic roles & 50–950 ramp

primary

#173EB4

secondary

#CEB159

accent

#C434F4

background

#F7F6FC

surface

#EEECF9

border

#C9C7D2

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #173EB4

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

Preview Lab → · Contrast checker → · Palette generator →