#171D55#171D55

#171D55 is a dark, moderate blue. Relative luminance 0.017; OKLCH L 26.5% C 0.101 H 272.8°. Best body text is #FFFFFF at 15.63:1 contrast (WCAG AA passes).

Color values

HEX	#171D55
RGB	rgb(23, 29, 85)
HSL	hsl(234, 57%, 21%)
HSV	hsv(234, 73%, 33%)
CMYK	cmyk(72.9%, 65.9%, 0%, 66.7%)
CIE-LAB	lab(13.92, 18.36, -34.87)
CIE-LCH	lch(13.92, 39.40, 297.77°)
OKLab	oklab(26.53% 0.0049 -0.1005)
OKLCH	oklch(26.53% 0.101 272.8)
XYZ	xyz(2.4319, 1.7165, 8.7957)
Luminance	0.0172 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171D55 #554F17

analogous

#173C55 #171D55 #301755

triadic

#171D55 #55171D #1D5517

tetradic

#171D55 #55173C #554F17 #175530

square

#171D55 #55173C #554F17 #175530

split-complementary

#171D55 #553017 #3C5517

monochromatic

#070818 #0A0D25 #171D55 #242D85 #313EB5

Accessibility & contrast

On white

15.63

#171D55 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.34

#171D55 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171D55

15.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171D55	#FFFFFF	#000000	##FFFFFF
##171D55	1.00	15.63	1.34	15.63
#FFFFFF	15.63	1.00	21.00	1.00
#000000	1.34	21.00	1.00	21.00
##FFFFFF	15.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002657

Deuteranopia (green-blind)

#002154

Tritanopia (blue-blind)

#002B35

Achromatopsia (no color)

#232323

Design tokens & code

CSS

--color: #171d55;
/* rgb */ color: rgb(23, 29, 85);
/* oklch */ color: oklch(26.5% 0.101 272.8);

Tailwind

colors: {
  custom: {
    50: '#5d5885',
    500: '#171d55',
    950: '#000000',
  },
}

SCSS

$custom: #171d55;
$custom-light: #5d5885;
$custom-dark: #000000;

JSON

{
  "hex": "#171d55",
  "rgb": {
    "r": 23,
    "g": 29,
    "b": 85
  },
  "hsl": {
    "h": 234.194,
    "s": 57.407,
    "l": 21.176
  },
  "oklch": {
    "l": 0.26525,
    "c": 0.10062,
    "h": 272.8
  },
  "luminance": 0.01717
}

Semantic roles & 50–950 ramp

primary

#171D55

secondary

#8C843C

accent

#D247E1

background

#F5F5F8

surface

#E9E9EF

border

#C5C5CA

text

#05030B

muted

#79787C

Preview Lab

Preview with #171D55

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

Preview Lab → · Contrast checker → · Palette generator →