#173E8B#173E8B

#173E8B is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.6% C 0.136 H 262.0°. Best body text is #FFFFFF at 10.01:1 contrast (WCAG AA passes).

Color values

HEX	#173E8B
RGB	rgb(23, 62, 139)
HSL	hsl(220, 72%, 32%)
HSV	hsv(220, 83%, 55%)
CMYK	cmyk(83.5%, 55.4%, 0%, 45.5%)
CIE-LAB	lab(28.09, 16.86, -46.66)
CIE-LCH	lch(28.09, 49.61, 289.87°)
OKLab	oklab(38.59% -0.0189 -0.1346)
OKLCH	oklch(38.59% 0.136 262)
XYZ	xyz(6.7345, 5.4907, 25.1260)
Luminance	0.0549 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173E8B #8B6417

analogous

#17788B #173E8B #2A178B

triadic

#173E8B #8B173E #3E8B17

tetradic

#173E8B #8B1778 #8B6417 #178B2A

square

#173E8B #8B1778 #8B6417 #178B2A

split-complementary

#173E8B #8B2A17 #788B17

monochromatic

#060F22 #0E2756 #173E8B #2055C0 #3D74DF

Accessibility & contrast

On white

10.01

#173E8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.10

#173E8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173E8B

10.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173E8B	#FFFFFF	#000000	##FFFFFF
##173E8B	1.00	10.01	2.10	10.01
#FFFFFF	10.01	1.00	21.00	1.00
#000000	2.10	21.00	1.00	21.00
##FFFFFF	10.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00488E

Deuteranopia (green-blind)

#003D89

Tritanopia (blue-blind)

#00515E

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #173e8b;
/* rgb */ color: rgb(23, 62, 139);
/* oklch */ color: oklch(38.6% 0.136 262.0);

Tailwind

colors: {
  custom: {
    50: '#6972ad',
    500: '#173e8b',
    950: '#000000',
  },
}

SCSS

$custom: #173e8b;
$custom-light: #6972ad;
$custom-dark: #000000;

JSON

{
  "hex": "#173e8b",
  "rgb": {
    "r": 23,
    "g": 62,
    "b": 139
  },
  "hsl": {
    "h": 219.828,
    "s": 71.605,
    "l": 31.765
  },
  "oklch": {
    "l": 0.38591,
    "c": 0.13592,
    "h": 262
  },
  "luminance": 0.05491
}

Semantic roles & 50–950 ramp

primary

#173E8B

secondary

#BF943F

accent

#B239EE

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #173E8B

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

Preview Lab → · Contrast checker → · Palette generator →