#171C81#171C81

#171C81 is a dark, vivid blue. Relative luminance 0.026; OKLCH L 31.1% C 0.163 H 270.0°. Best body text is #FFFFFF at 13.82:1 contrast (WCAG AA passes).

Color values

HEX	#171C81
RGB	rgb(23, 28, 129)
HSL	hsl(237, 70%, 30%)
HSV	hsv(237, 82%, 51%)
CMYK	cmyk(82.2%, 78.3%, 0%, 49.4%)
CIE-LAB	lab(18.35, 35.84, -56.36)
CIE-LCH	lch(18.35, 66.79, 302.45°)
OKLab	oklab(31.13% 0.0001 -0.1632)
OKLCH	oklch(31.13% 0.163 270)
XYZ	xyz(4.7297, 2.5971, 21.0166)
Luminance	0.0260 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171C81 #817C17

analogous

#175181 #171C81 #471781

triadic

#171C81 #81171C #1C8117

tetradic

#171C81 #811751 #817C17 #178147

square

#171C81 #811751 #817C17 #178147

split-complementary

#171C81 #814717 #518117

monochromatic

#05061A #0E114D #171C81 #2027B5 #373FDB

Accessibility & contrast

On white

13.82

#171C81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.52

#171C81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171C81

13.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171C81	#FFFFFF	#000000	##FFFFFF
##171C81	1.00	13.82	1.52	13.82
#FFFFFF	13.82	1.00	21.00	1.00
#000000	1.52	21.00	1.00	21.00
##FFFFFF	13.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003284

Deuteranopia (green-blind)

#00277F

Tritanopia (blue-blind)

#003A4D

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #171c81;
/* rgb */ color: rgb(23, 28, 129);
/* oklch */ color: oklch(31.1% 0.163 270.0);

Tailwind

colors: {
  custom: {
    50: '#6a5aa7',
    500: '#171c81',
    950: '#000000',
  },
}

SCSS

$custom: #171c81;
$custom-light: #6a5aa7;
$custom-dark: #000000;

JSON

{
  "hex": "#171c81",
  "rgb": {
    "r": 23,
    "g": 28,
    "b": 129
  },
  "hsl": {
    "h": 237.17,
    "s": 69.737,
    "l": 29.804
  },
  "oklch": {
    "l": 0.3113,
    "c": 0.16324,
    "h": 270
  },
  "luminance": 0.02598
}

Semantic roles & 50–950 ramp

primary

#171C81

secondary

#B5B03E

accent

#E43BED

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#080410

muted

#7A797F

Preview Lab

Preview with #171C81

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

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