#173F9E#173F9E

#173F9E is a dark, vivid blue. Relative luminance 0.062; OKLCH L 40.5% C 0.161 H 263.5°. Best body text is #FFFFFF at 9.37:1 contrast (WCAG AA passes).

Color values

HEX	#173F9E
RGB	rgb(23, 63, 158)
HSL	hsl(222, 75%, 35%)
HSV	hsv(222, 85%, 62%)
CMYK	cmyk(85.4%, 60.1%, 0%, 38%)
CIE-LAB	lab(29.92, 23.88, -55.30)
CIE-LCH	lch(29.92, 60.24, 293.36°)
OKLab	oklab(40.46% -0.0182 -0.16)
OKLCH	oklch(40.46% 0.161 263.5)
XYZ	xyz(8.3002, 6.2048, 33.1013)
Luminance	0.0621 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F9E #9E7617

analogous

#17829E #173F9E #32179E

triadic

#173F9E #9E173F #3F9E17

tetradic

#173F9E #9E1782 #9E7617 #179E32

square

#173F9E #9E1782 #9E7617 #179E32

split-complementary

#173F9E #9E3217 #829E17

monochromatic

#071433 #0F2A69 #173F9E #1F54D3 #4B78E5

Accessibility & contrast

On white

9.37

#173F9E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.24

#173F9E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F9E

9.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F9E	#FFFFFF	#000000	##FFFFFF
##173F9E	1.00	9.37	2.24	9.37
#FFFFFF	9.37	1.00	21.00	1.00
#000000	2.24	21.00	1.00	21.00
##FFFFFF	9.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DA1

Deuteranopia (green-blind)

#00409C

Tritanopia (blue-blind)

#005768

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #173f9e;
/* rgb */ color: rgb(23, 63, 158);
/* oklch */ color: oklch(40.5% 0.161 263.5);

Tailwind

colors: {
  custom: {
    50: '#6e73bb',
    500: '#173f9e',
    950: '#000000',
  },
}

SCSS

$custom: #173f9e;
$custom-light: #6e73bb;
$custom-dark: #000000;

JSON

{
  "hex": "#173f9e",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 158
  },
  "hsl": {
    "h": 222.222,
    "s": 74.586,
    "l": 35.49
  },
  "oklch": {
    "l": 0.4046,
    "c": 0.16101,
    "h": 263.5
  },
  "luminance": 0.06206
}

Semantic roles & 50–950 ramp

primary

#173F9E

secondary

#C6A24A

accent

#BA37F1

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #173F9E

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

Preview Lab → · Contrast checker → · Palette generator →