#173B86#173B86

#173B86 is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.5% C 0.133 H 262.6°. Best body text is #FFFFFF at 10.47:1 contrast (WCAG AA passes).

Color values

HEX	#173B86
RGB	rgb(23, 59, 134)
HSL	hsl(221, 71%, 31%)
HSV	hsv(221, 83%, 53%)
CMYK	cmyk(82.8%, 56%, 0%, 47.5%)
CIE-LAB	lab(26.82, 16.90, -45.61)
CIE-LCH	lch(26.82, 48.64, 290.33°)
OKLab	oklab(37.51% -0.0172 -0.1316)
OKLCH	oklch(37.51% 0.133 262.6)
XYZ	xyz(6.2188, 5.0306, 23.1929)
Luminance	0.0503 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B86 #866217

analogous

#177286 #173B86 #2B1786

triadic

#173B86 #86173B #3B8617

tetradic

#173B86 #861772 #866217 #17862B

square

#173B86 #861772 #866217 #17862B

split-complementary

#173B86 #862B17 #728617

monochromatic

#050D1E #0E2452 #173B86 #2052BA #3A6FDD

Accessibility & contrast

On white

10.47

#173B86 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.01

#173B86 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B86

10.47:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B86	#FFFFFF	#000000	##FFFFFF
##173B86	1.00	10.47	2.01	10.47
#FFFFFF	10.47	1.00	21.00	1.00
#000000	2.01	21.00	1.00	21.00
##FFFFFF	10.47	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004589

Deuteranopia (green-blind)

#003B85

Tritanopia (blue-blind)

#004E5A

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #173b86;
/* rgb */ color: rgb(23, 59, 134);
/* oklch */ color: oklch(37.5% 0.133 262.6);

Tailwind

colors: {
  custom: {
    50: '#6870aa',
    500: '#173b86',
    950: '#000000',
  },
}

SCSS

$custom: #173b86;
$custom-light: #6870aa;
$custom-dark: #000000;

JSON

{
  "hex": "#173b86",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 134
  },
  "hsl": {
    "h": 220.541,
    "s": 70.701,
    "l": 30.784
  },
  "oklch": {
    "l": 0.37506,
    "c": 0.13271,
    "h": 262.6
  },
  "luminance": 0.05031
}

Semantic roles & 50–950 ramp

primary

#173B86

secondary

#BA923F

accent

#B33AED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #173B86

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

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