#171D81#171D81

#171D81 is a dark, vivid blue. Relative luminance 0.026; OKLCH L 31.3% C 0.162 H 269.9°. Best body text is #FFFFFF at 13.73:1 contrast (WCAG AA passes).

Color values

HEX	#171D81
RGB	rgb(23, 29, 129)
HSL	hsl(237, 70%, 30%)
HSV	hsv(237, 82%, 51%)
CMYK	cmyk(82.2%, 77.5%, 0%, 49.4%)
CIE-LAB	lab(18.56, 35.24, -56.01)
CIE-LCH	lch(18.56, 66.17, 302.18°)
OKLab	oklab(31.28% -0.0002 -0.1622)
OKLCH	oklch(31.28% 0.162 269.9)
XYZ	xyz(4.7538, 2.6453, 21.0247)
Luminance	0.0265 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171D81 #817B17

analogous

#175281 #171D81 #461781

triadic

#171D81 #81171D #1D8117

tetradic

#171D81 #811752 #817B17 #178146

square

#171D81 #811752 #817B17 #178146

split-complementary

#171D81 #814617 #528117

monochromatic

#05061A #0E114D #171D81 #2029B5 #3740DB

Accessibility & contrast

On white

13.73

#171D81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.53

#171D81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171D81

13.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171D81	#FFFFFF	#000000	##FFFFFF
##171D81	1.00	13.73	1.53	13.73
#FFFFFF	13.73	1.00	21.00	1.00
#000000	1.53	21.00	1.00	21.00
##FFFFFF	13.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003284

Deuteranopia (green-blind)

#00287F

Tritanopia (blue-blind)

#003B4E

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #171d81;
/* rgb */ color: rgb(23, 29, 129);
/* oklch */ color: oklch(31.3% 0.162 269.9);

Tailwind

colors: {
  custom: {
    50: '#6a5aa7',
    500: '#171d81',
    950: '#000000',
  },
}

SCSS

$custom: #171d81;
$custom-light: #6a5aa7;
$custom-dark: #000000;

JSON

{
  "hex": "#171d81",
  "rgb": {
    "r": 23,
    "g": 29,
    "b": 129
  },
  "hsl": {
    "h": 236.604,
    "s": 69.737,
    "l": 29.804
  },
  "oklch": {
    "l": 0.3128,
    "c": 0.16223,
    "h": 269.9
  },
  "luminance": 0.02646
}

Semantic roles & 50–950 ramp

primary

#171D81

secondary

#B5AF3E

accent

#E33BED

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#080410

muted

#7A797F

Preview Lab

Preview with #171D81

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

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