#171F40#171F40

#171F40 is a dark, moderate blue. Relative luminance 0.015; OKLCH L 25.1% C 0.063 H 271.0°. Best body text is #FFFFFF at 16.07:1 contrast (WCAG AA passes).

Color values

HEX	#171F40
RGB	rgb(23, 31, 64)
HSL	hsl(228, 47%, 17%)
HSV	hsv(228, 64%, 25%)
CMYK	cmyk(64.1%, 51.6%, 0%, 74.9%)
CIE-LAB	lab(12.81, 8.30, -22.19)
CIE-LCH	lch(12.81, 23.70, 290.51°)
OKLab	oklab(25.14% 0.0011 -0.0632)
OKLCH	oklch(25.14% 0.063 271)
XYZ	xyz(1.7684, 1.5322, 5.0520)
Luminance	0.0153 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171F40 #403817

analogous

#173440 #171F40 #241740

triadic

#171F40 #40171F #1F4017

tetradic

#171F40 #401734 #403817 #174024

square

#171F40 #401734 #403817 #174024

split-complementary

#171F40 #402417 #344017

monochromatic

#080B17 #080B17 #171F40 #27356D #374B9A

Accessibility & contrast

On white

16.07

#171F40 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.31

#171F40 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171F40

16.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171F40	#FFFFFF	#000000	##FFFFFF
##171F40	1.00	16.07	1.31	16.07
#FFFFFF	16.07	1.00	21.00	1.00
#000000	1.31	21.00	1.00	21.00
##FFFFFF	16.07	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#102341

Deuteranopia (green-blind)

#0B1F3F

Tritanopia (blue-blind)

#02262C

Achromatopsia (no color)

#212121

Design tokens & code

CSS

--color: #171f40;
/* rgb */ color: rgb(23, 31, 64);
/* oklch */ color: oklch(25.1% 0.063 271.0);

Tailwind

colors: {
  custom: {
    50: '#585a75',
    500: '#171f40',
    950: '#000000',
  },
}

SCSS

$custom: #171f40;
$custom-light: #585a75;
$custom-dark: #000000;

JSON

{
  "hex": "#171f40",
  "rgb": {
    "r": 23,
    "g": 31,
    "b": 64
  },
  "hsl": {
    "h": 228.293,
    "s": 47.126,
    "l": 17.059
  },
  "oklch": {
    "l": 0.25142,
    "c": 0.06323,
    "h": 271
  },
  "luminance": 0.01532
}

Semantic roles & 50–950 ramp

primary

#171F40

secondary

#776B3C

accent

#BD51D7

background

#F5F5F7

surface

#E9E9ED

border

#C5C5C8

text

#030308

muted

#78787B

Preview Lab

Preview with #171F40

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

Preview Lab → · Contrast checker → · Palette generator →