#171855#171855

#171855 is a dark, moderate blue. Relative luminance 0.015; OKLCH L 25.5% C 0.108 H 275.0°. Best body text is #FFFFFF at 16.18:1 contrast (WCAG AA passes).

Color values

HEX	#171855
RGB	rgb(23, 24, 85)
HSL	hsl(239, 57%, 21%)
HSV	hsv(239, 73%, 33%)
CMYK	cmyk(72.9%, 71.8%, 0%, 66.7%)
CIE-LAB	lab(12.55, 21.95, -37.11)
CIE-LCH	lch(12.55, 43.12, 300.61°)
OKLab	oklab(25.52% 0.0093 -0.1071)
OKLCH	oklch(25.52% 0.108 275)
XYZ	xyz(2.3191, 1.4911, 8.7582)
Luminance	0.0149 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171855 #555417

analogous

#173755 #171855 #351755

triadic

#171855 #551718 #185517

tetradic

#171855 #551737 #555417 #175535

square

#171855 #551737 #555417 #175535

split-complementary

#171855 #553517 #375517

monochromatic

#070718 #0A0A25 #171855 #242685 #3133B5

Accessibility & contrast

On white

16.18

#171855 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.30

#171855 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171855

16.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171855	#FFFFFF	#000000	##FFFFFF
##171855	1.00	16.18	1.30	16.18
#FFFFFF	16.18	1.00	21.00	1.00
#000000	1.30	21.00	1.00	21.00
##FFFFFF	16.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002357

Deuteranopia (green-blind)

#001E54

Tritanopia (blue-blind)

#002834

Achromatopsia (no color)

#212121

Design tokens & code

CSS

--color: #171855;
/* rgb */ color: rgb(23, 24, 85);
/* oklch */ color: oklch(25.5% 0.108 275.0);

Tailwind

colors: {
  custom: {
    50: '#5e5586',
    500: '#171855',
    950: '#000000',
  },
}

SCSS

$custom: #171855;
$custom-light: #5e5586;
$custom-dark: #000000;

JSON

{
  "hex": "#171855",
  "rgb": {
    "r": 23,
    "g": 24,
    "b": 85
  },
  "hsl": {
    "h": 239.032,
    "s": 57.407,
    "l": 21.176
  },
  "oklch": {
    "l": 0.25519,
    "c": 0.10752,
    "h": 275
  },
  "luminance": 0.01491
}

Semantic roles & 50–950 ramp

primary

#171855

secondary

#8C8B3C

accent

#DE47E1

background

#F5F4F8

surface

#EAE8EF

border

#C6C4CA

text

#05030B

muted

#79787C

Preview Lab

Preview with #171855

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

Preview Lab → · Contrast checker → · Palette generator →