#173F8E#173F8E

#173F8E is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.1% C 0.139 H 262.0°. Best body text is #FFFFFF at 9.82:1 contrast (WCAG AA passes).

Color values

HEX	#173F8E
RGB	rgb(23, 63, 142)
HSL	hsl(220, 72%, 32%)
HSV	hsv(220, 84%, 56%)
CMYK	cmyk(83.8%, 55.6%, 0%, 44.3%)
CIE-LAB	lab(28.61, 17.39, -47.66)
CIE-LCH	lch(28.61, 50.73, 290.05°)
OKLab	oklab(39.06% -0.0193 -0.1375)
OKLCH	oklch(39.06% 0.139 262)
XYZ	xyz(7.0116, 5.6893, 26.3145)
Luminance	0.0569 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F8E #8E6617

analogous

#177A8E #173F8E #2B178E

triadic

#173F8E #8E173F #3F8E17

tetradic

#173F8E #8E177A #8E6617 #178E2B

square

#173F8E #8E177A #8E6617 #178E2B

split-complementary

#173F8E #8E2B17 #7A8E17

monochromatic

#061025 #0E2859 #173F8E #2056C3 #3F75E0

Accessibility & contrast

On white

9.82

#173F8E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.14

#173F8E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F8E

9.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F8E	#FFFFFF	#000000	##FFFFFF
##173F8E	1.00	9.82	2.14	9.82
#FFFFFF	9.82	1.00	21.00	1.00
#000000	2.14	21.00	1.00	21.00
##FFFFFF	9.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004991

Deuteranopia (green-blind)

#003E8C

Tritanopia (blue-blind)

#005360

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #173f8e;
/* rgb */ color: rgb(23, 63, 142);
/* oklch */ color: oklch(39.1% 0.139 262.0);

Tailwind

colors: {
  custom: {
    50: '#6a73b0',
    500: '#173f8e',
    950: '#000000',
  },
}

SCSS

$custom: #173f8e;
$custom-light: #6a73b0;
$custom-dark: #000000;

JSON

{
  "hex": "#173f8e",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 142
  },
  "hsl": {
    "h": 219.832,
    "s": 72.121,
    "l": 32.353
  },
  "oklch": {
    "l": 0.39064,
    "c": 0.13886,
    "h": 262
  },
  "luminance": 0.0569
}

Semantic roles & 50–950 ramp

primary

#173F8E

secondary

#C09540

accent

#B239EF

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #173F8E

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

Preview Lab → · Contrast checker → · Palette generator →