#173FA0#173FA0

#173FA0 is a dark, vivid blue. Relative luminance 0.063; OKLCH L 40.6% C 0.164 H 263.7°. Best body text is #FFFFFF at 9.31:1 contrast (WCAG AA passes).

Color values

HEX	#173FA0
RGB	rgb(23, 63, 160)
HSL	hsl(222, 75%, 36%)
HSV	hsv(222, 86%, 63%)
CMYK	cmyk(85.6%, 60.6%, 0%, 37.3%)
CIE-LAB	lab(30.09, 24.68, -56.23)
CIE-LCH	lch(30.09, 61.41, 293.70°)
OKLab	oklab(40.64% -0.0181 -0.1627)
OKLCH	oklch(40.64% 0.164 263.7)
XYZ	xyz(8.4738, 6.2742, 34.0153)
Luminance	0.0628 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173FA0 #A07817

analogous

#1783A0 #173FA0 #3417A0

triadic

#173FA0 #A0173F #3FA017

tetradic

#173FA0 #A01783 #A07817 #17A034

square

#173FA0 #A01783 #A07817 #17A034

split-complementary

#173FA0 #A03417 #83A017

monochromatic

#081535 #0F2A6A #173FA0 #1F54D6 #4C79E5

Accessibility & contrast

On white

9.31

#173FA0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.26

#173FA0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173FA0

9.31:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173FA0	#FFFFFF	#000000	##FFFFFF
##173FA0	1.00	9.31	2.26	9.31
#FFFFFF	9.31	1.00	21.00	1.00
#000000	2.26	21.00	1.00	21.00
##FFFFFF	9.31	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DA3

Deuteranopia (green-blind)

#00419E

Tritanopia (blue-blind)

#005869

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #173fa0;
/* rgb */ color: rgb(23, 63, 160);
/* oklch */ color: oklch(40.6% 0.164 263.7);

Tailwind

colors: {
  custom: {
    50: '#6f73bd',
    500: '#173fa0',
    950: '#000000',
  },
}

SCSS

$custom: #173fa0;
$custom-light: #6f73bd;
$custom-dark: #000000;

JSON

{
  "hex": "#173fa0",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 160
  },
  "hsl": {
    "h": 222.482,
    "s": 74.863,
    "l": 35.882
  },
  "oklch": {
    "l": 0.4064,
    "c": 0.16371,
    "h": 263.7
  },
  "luminance": 0.06275
}

Semantic roles & 50–950 ramp

primary

#173FA0

secondary

#C7A34C

accent

#BB36F1

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #173FA0

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

Preview Lab → · Contrast checker → · Palette generator →