#173FA1#173FA1

#173FA1 is a dark, vivid blue. Relative luminance 0.063; OKLCH L 40.7% C 0.165 H 263.7°. Best body text is #FFFFFF at 9.28:1 contrast (WCAG AA passes).

Color values

HEX	#173FA1
RGB	rgb(23, 63, 161)
HSL	hsl(223, 75%, 36%)
HSV	hsv(223, 86%, 63%)
CMYK	cmyk(85.7%, 60.9%, 0%, 36.9%)
CIE-LAB	lab(30.18, 25.08, -56.70)
CIE-LCH	lch(30.18, 62.00, 293.86°)
OKLab	oklab(40.73% -0.0181 -0.1641)
OKLCH	oklch(40.73% 0.165 263.7)
XYZ	xyz(8.5616, 6.3093, 34.4779)
Luminance	0.0631 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173FA1 #A17917

analogous

#1784A1 #173FA1 #3417A1

triadic

#173FA1 #A1173F #3FA117

tetradic

#173FA1 #A11784 #A17917 #17A134

square

#173FA1 #A11784 #A17917 #17A134

split-complementary

#173FA1 #A13417 #84A117

monochromatic

#081536 #0F2A6B #173FA1 #1F54D7 #4D79E6

Accessibility & contrast

On white

9.28

#173FA1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.26

#173FA1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173FA1

9.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173FA1	#FFFFFF	#000000	##FFFFFF
##173FA1	1.00	9.28	2.26	9.28
#FFFFFF	9.28	1.00	21.00	1.00
#000000	2.26	21.00	1.00	21.00
##FFFFFF	9.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004EA4

Deuteranopia (green-blind)

#00419F

Tritanopia (blue-blind)

#00586A

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #173fa1;
/* rgb */ color: rgb(23, 63, 161);
/* oklch */ color: oklch(40.7% 0.165 263.7);

Tailwind

colors: {
  custom: {
    50: '#6f73be',
    500: '#173fa1',
    950: '#000000',
  },
}

SCSS

$custom: #173fa1;
$custom-light: #6f73be;
$custom-dark: #000000;

JSON

{
  "hex": "#173fa1",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 161
  },
  "hsl": {
    "h": 222.609,
    "s": 75,
    "l": 36.078
  },
  "oklch": {
    "l": 0.40731,
    "c": 0.16506,
    "h": 263.7
  },
  "luminance": 0.0631
}

Semantic roles & 50–950 ramp

primary

#173FA1

secondary

#C7A44C

accent

#BB36F2

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #173FA1

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

Preview Lab → · Contrast checker → · Palette generator →