#171B88#171B88

#171B88 is a dark, vivid blue. Relative luminance 0.027; OKLCH L 31.8% C 0.173 H 269.7°. Best body text is #FFFFFF at 13.56:1 contrast (WCAG AA passes).

Color values

HEX	#171B88
RGB	rgb(23, 27, 136)
HSL	hsl(238, 71%, 31%)
HSV	hsv(238, 83%, 53%)
CMYK	cmyk(83.1%, 80.1%, 0%, 46.7%)
CIE-LAB	lab(18.98, 38.87, -59.73)
CIE-LCH	lch(18.98, 71.26, 303.06°)
OKLab	oklab(31.82% -0.0008 -0.173)
OKLCH	oklch(31.82% 0.173 269.7)
XYZ	xyz(5.1877, 2.7430, 23.5438)
Luminance	0.0274 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171B88 #888417

analogous

#175388 #171B88 #4B1788

triadic

#171B88 #88171B #1B8817

tetradic

#171B88 #881753 #888417 #17884B

square

#171B88 #881753 #888417 #17884B

split-complementary

#171B88 #884B17 #538817

monochromatic

#05061F #0E1154 #171B88 #2025BC #3B41DE

Accessibility & contrast

On white

13.56

#171B88 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.55

#171B88 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171B88

13.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171B88	#FFFFFF	#000000	##FFFFFF
##171B88	1.00	13.56	1.55	13.56
#FFFFFF	13.56	1.00	21.00	1.00
#000000	1.55	21.00	1.00	21.00
##FFFFFF	13.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00348B

Deuteranopia (green-blind)

#002886

Tritanopia (blue-blind)

#003C51

Achromatopsia (no color)

#2E2E2E

Design tokens & code

CSS

--color: #171b88;
/* rgb */ color: rgb(23, 27, 136);
/* oklch */ color: oklch(31.8% 0.173 269.7);

Tailwind

colors: {
  custom: {
    50: '#6c59ac',
    500: '#171b88',
    950: '#000000',
  },
}

SCSS

$custom: #171b88;
$custom-light: #6c59ac;
$custom-dark: #000000;

JSON

{
  "hex": "#171b88",
  "rgb": {
    "r": 23,
    "g": 27,
    "b": 136
  },
  "hsl": {
    "h": 237.876,
    "s": 71.069,
    "l": 31.176
  },
  "oklch": {
    "l": 0.31819,
    "c": 0.173,
    "h": 269.7
  },
  "luminance": 0.02744
}

Semantic roles & 50–950 ramp

primary

#171B88

secondary

#BCB73F

accent

#E73AEE

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#080410

muted

#7B797F

Preview Lab

Preview with #171B88

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

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