#173B8F#173B8F

#173B8F is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.3% C 0.145 H 263.5°. Best body text is #FFFFFF at 10.20:1 contrast (WCAG AA passes).

Color values

HEX	#173B8F
RGB	rgb(23, 59, 143)
HSL	hsl(222, 72%, 33%)
HSV	hsv(222, 84%, 56%)
CMYK	cmyk(83.9%, 58.7%, 0%, 43.9%)
CIE-LAB	lab(27.55, 20.59, -50.00)
CIE-LCH	lch(27.55, 54.07, 292.38°)
OKLab	oklab(38.29% -0.0165 -0.1445)
OKLCH	oklch(38.29% 0.145 263.5)
XYZ	xyz(6.8735, 5.2924, 26.6405)
Luminance	0.0529 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B8F #8F6B17

analogous

#17778F #173B8F #2F178F

triadic

#173B8F #8F173B #3B8F17

tetradic

#173B8F #8F1777 #8F6B17 #178F2F

square

#173B8F #8F1777 #8F6B17 #178F2F

split-complementary

#173B8F #8F2F17 #778F17

monochromatic

#060F26 #0F255A #173B8F #1F51C4 #4070E0

Accessibility & contrast

On white

10.20

#173B8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.06

#173B8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B8F

10.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B8F	#FFFFFF	#000000	##FFFFFF
##173B8F	1.00	10.20	2.06	10.20
#FFFFFF	10.20	1.00	21.00	1.00
#000000	2.06	21.00	1.00	21.00
##FFFFFF	10.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004792

Deuteranopia (green-blind)

#003C8D

Tritanopia (blue-blind)

#00505F

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #173b8f;
/* rgb */ color: rgb(23, 59, 143);
/* oklch */ color: oklch(38.3% 0.145 263.5);

Tailwind

colors: {
  custom: {
    50: '#6b70b1',
    500: '#173b8f',
    950: '#000000',
  },
}

SCSS

$custom: #173b8f;
$custom-light: #6b70b1;
$custom-dark: #000000;

JSON

{
  "hex": "#173b8f",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 143
  },
  "hsl": {
    "h": 222,
    "s": 72.289,
    "l": 32.549
  },
  "oklch": {
    "l": 0.38287,
    "c": 0.14543,
    "h": 263.5
  },
  "luminance": 0.05293
}

Semantic roles & 50–950 ramp

primary

#173B8F

secondary

#C19A41

accent

#B839EF

background

#F6F6FB

surface

#ECECF6

border

#C7C7D0

text

#080711

muted

#7A7A80

Preview Lab

Preview with #173B8F

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

Preview Lab → · Contrast checker → · Palette generator →