#173F8D#173F8D

#173F8D is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.0% C 0.137 H 261.9°. Best body text is #FFFFFF at 9.85:1 contrast (WCAG AA passes).

Color values

HEX	#173F8D
RGB	rgb(23, 63, 141)
HSL	hsl(220, 72%, 32%)
HSV	hsv(220, 84%, 55%)
CMYK	cmyk(83.7%, 55.3%, 0%, 44.7%)
CIE-LAB	lab(28.54, 16.98, -47.17)
CIE-LCH	lch(28.54, 50.13, 289.80°)
OKLab	oklab(38.98% -0.0194 -0.1361)
OKLCH	oklch(38.98% 0.137 261.9)
XYZ	xyz(6.9368, 5.6594, 25.9209)
Luminance	0.0566 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F8D #8D6517

analogous

#177A8D #173F8D #2A178D

triadic

#173F8D #8D173F #3F8D17

tetradic

#173F8D #8D177A #8D6517 #178D2A

square

#173F8D #8D177A #8D6517 #178D2A

split-complementary

#173F8D #8D2A17 #7A8D17

monochromatic

#061024 #0E2758 #173F8D #2057C2 #3F75E0

Accessibility & contrast

On white

9.85

#173F8D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.13

#173F8D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F8D

9.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F8D	#FFFFFF	#000000	##FFFFFF
##173F8D	1.00	9.85	2.13	9.85
#FFFFFF	9.85	1.00	21.00	1.00
#000000	2.13	21.00	1.00	21.00
##FFFFFF	9.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004990

Deuteranopia (green-blind)

#003E8B

Tritanopia (blue-blind)

#00525F

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #173f8d;
/* rgb */ color: rgb(23, 63, 141);
/* oklch */ color: oklch(39.0% 0.137 261.9);

Tailwind

colors: {
  custom: {
    50: '#6a73af',
    500: '#173f8d',
    950: '#000000',
  },
}

SCSS

$custom: #173f8d;
$custom-light: #6a73af;
$custom-dark: #000000;

JSON

{
  "hex": "#173f8d",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 141
  },
  "hsl": {
    "h": 219.661,
    "s": 71.951,
    "l": 32.157
  },
  "oklch": {
    "l": 0.3898,
    "c": 0.13745,
    "h": 261.9
  },
  "luminance": 0.0566
}

Semantic roles & 50–950 ramp

primary

#173F8D

secondary

#C09540

accent

#B139EF

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #173F8D

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

Preview Lab → · Contrast checker → · Palette generator →