#171F8B#171F8B

#171F8B is a dark, vivid blue. Relative luminance 0.030; OKLCH L 32.7% C 0.173 H 269.2°. Best body text is #FFFFFF at 13.08:1 contrast (WCAG AA passes).

Color values

HEX	#171F8B
RGB	rgb(23, 31, 139)
HSL	hsl(236, 72%, 32%)
HSV	hsv(236, 83%, 55%)
CMYK	cmyk(83.5%, 77.7%, 0%, 45.5%)
CIE-LAB	lab(20.15, 37.61, -59.68)
CIE-LCH	lch(20.15, 70.55, 302.22°)
OKLab	oklab(32.74% -0.0026 -0.1729)
OKLCH	oklch(32.74% 0.173 269.2)
XYZ	xyz(5.5019, 3.0256, 24.7151)
Luminance	0.0303 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171F8B #8B8317

analogous

#17598B #171F8B #49178B

triadic

#171F8B #8B171F #1F8B17

tetradic

#171F8B #8B1759 #8B8317 #178B49

square

#171F8B #8B1759 #8B8317 #178B49

split-complementary

#171F8B #8B4917 #598B17

monochromatic

#060822 #0E1356 #171F8B #202BC0 #3D49DF

Accessibility & contrast

On white

13.08

#171F8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.61

#171F8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171F8B

13.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171F8B	#FFFFFF	#000000	##FFFFFF
##171F8B	1.00	13.08	1.61	13.08
#FFFFFF	13.08	1.00	21.00	1.00
#000000	1.61	21.00	1.00	21.00
##FFFFFF	13.08	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00368E

Deuteranopia (green-blind)

#002B89

Tritanopia (blue-blind)

#003F54

Achromatopsia (no color)

#313131

Design tokens & code

CSS

--color: #171f8b;
/* rgb */ color: rgb(23, 31, 139);
/* oklch */ color: oklch(32.7% 0.173 269.2);

Tailwind

colors: {
  custom: {
    50: '#6c5cae',
    500: '#171f8b',
    950: '#000000',
  },
}

SCSS

$custom: #171f8b;
$custom-light: #6c5cae;
$custom-dark: #000000;

JSON

{
  "hex": "#171f8b",
  "rgb": {
    "r": 23,
    "g": 31,
    "b": 139
  },
  "hsl": {
    "h": 235.862,
    "s": 71.605,
    "l": 31.765
  },
  "oklch": {
    "l": 0.32743,
    "c": 0.17293,
    "h": 269.2
  },
  "luminance": 0.03026
}

Semantic roles & 50–950 ramp

primary

#171F8B

secondary

#BFB63F

accent

#E239EE

background

#F7F5FA

surface

#EDE9F5

border

#C8C5CF

text

#080410

muted

#7B797F

Preview Lab

Preview with #171F8B

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

Preview Lab → · Contrast checker → · Palette generator →