#173F86#173F86

#173F86 is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.4% C 0.128 H 260.9°. Best body text is #FFFFFF at 10.04:1 contrast (WCAG AA passes).

Color values

HEX	#173F86
RGB	rgb(23, 63, 134)
HSL	hsl(218, 71%, 31%)
HSV	hsv(218, 83%, 53%)
CMYK	cmyk(82.8%, 53%, 0%, 47.5%)
CIE-LAB	lab(28.00, 14.10, -43.70)
CIE-LCH	lch(28.00, 45.92, 287.88°)
OKLab	oklab(38.4% -0.0202 -0.1259)
OKLCH	oklch(38.4% 0.128 260.9)
XYZ	xyz(6.4324, 5.4576, 23.2640)
Luminance	0.0546 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F86 #865E17

analogous

#177686 #173F86 #261786

triadic

#173F86 #86173F #3F8617

tetradic

#173F86 #861776 #865E17 #178626

square

#173F86 #861776 #865E17 #178626

split-complementary

#173F86 #862617 #768617

monochromatic

#050E1E #0E2652 #173F86 #2058BA #3A75DD

Accessibility & contrast

On white

10.04

#173F86 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.09

#173F86 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F86

10.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F86	#FFFFFF	#000000	##FFFFFF
##173F86	1.00	10.04	2.09	10.04
#FFFFFF	10.04	1.00	21.00	1.00
#000000	2.09	21.00	1.00	21.00
##FFFFFF	10.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0F4789

Deuteranopia (green-blind)

#003D85

Tritanopia (blue-blind)

#00505C

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #173f86;
/* rgb */ color: rgb(23, 63, 134);
/* oklch */ color: oklch(38.4% 0.128 260.9);

Tailwind

colors: {
  custom: {
    50: '#6873aa',
    500: '#173f86',
    950: '#000000',
  },
}

SCSS

$custom: #173f86;
$custom-light: #6873aa;
$custom-dark: #000000;

JSON

{
  "hex": "#173f86",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 134
  },
  "hsl": {
    "h": 218.378,
    "s": 70.701,
    "l": 30.784
  },
  "oklch": {
    "l": 0.38403,
    "c": 0.1275,
    "h": 260.9
  },
  "luminance": 0.05458
}

Semantic roles & 50–950 ramp

primary

#173F86

secondary

#BA8E3F

accent

#AD3AED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #173F86

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

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