#173F9D#173F9D

#173F9D is a dark, vivid blue. Relative luminance 0.062; OKLCH L 40.4% C 0.160 H 263.4°. Best body text is #FFFFFF at 9.40:1 contrast (WCAG AA passes).

Color values

HEX	#173F9D
RGB	rgb(23, 63, 157)
HSL	hsl(222, 74%, 35%)
HSV	hsv(222, 85%, 62%)
CMYK	cmyk(85.4%, 59.9%, 0%, 38.4%)
CIE-LAB	lab(29.84, 23.48, -54.83)
CIE-LCH	lch(29.84, 59.65, 293.18°)
OKLab	oklab(40.37% -0.0182 -0.1586)
OKLCH	oklch(40.37% 0.16 263.4)
XYZ	xyz(8.2145, 6.1705, 32.6498)
Luminance	0.0617 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F9D #9D7517

analogous

#17829D #173F9D #32179D

triadic

#173F9D #9D173F #3F9D17

tetradic

#173F9D #9D1782 #9D7517 #179D32

square

#173F9D #9D1782 #9D7517 #179D32

split-complementary

#173F9D #9D3217 #829D17

monochromatic

#071432 #0F2A68 #173F9D #1F54D2 #4A78E4

Accessibility & contrast

On white

9.40

#173F9D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#173F9D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F9D

9.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F9D	#FFFFFF	#000000	##FFFFFF
##173F9D	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)

#004DA0

Deuteranopia (green-blind)

#00409B

Tritanopia (blue-blind)

#005767

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #173f9d;
/* rgb */ color: rgb(23, 63, 157);
/* oklch */ color: oklch(40.4% 0.160 263.4);

Tailwind

colors: {
  custom: {
    50: '#6e73bb',
    500: '#173f9d',
    950: '#000000',
  },
}

SCSS

$custom: #173f9d;
$custom-light: #6e73bb;
$custom-dark: #000000;

JSON

{
  "hex": "#173f9d",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 157
  },
  "hsl": {
    "h": 222.09,
    "s": 74.444,
    "l": 35.294
  },
  "oklch": {
    "l": 0.4037,
    "c": 0.15965,
    "h": 263.4
  },
  "luminance": 0.06171
}

Semantic roles & 50–950 ramp

primary

#173F9D

secondary

#C6A14A

accent

#B937F1

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #173F9D

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

Preview Lab → · Contrast checker → · Palette generator →