#171F5B#171F5B

#171F5B is a dark, moderate blue. Relative luminance 0.019; OKLCH L 27.5% C 0.107 H 271.6°. Best body text is #FFFFFF at 15.18:1 contrast (WCAG AA passes).

Color values

HEX	#171F5B
RGB	rgb(23, 31, 91)
HSL	hsl(233, 60%, 22%)
HSV	hsv(233, 75%, 36%)
CMYK	cmyk(74.7%, 65.9%, 0%, 64.3%)
CIE-LAB	lab(15.05, 19.32, -37.07)
CIE-LCH	lch(15.05, 41.80, 297.53°)
OKLab	oklab(27.53% 0.0029 -0.107)
OKLCH	oklch(27.53% 0.107 271.6)
XYZ	xyz(2.7310, 1.9172, 10.1216)
Luminance	0.0192 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171F5B #5B5317

analogous

#17415B #171F5B #31175B

triadic

#171F5B #5B171F #1F5B17

tetradic

#171F5B #5B1741 #5B5317 #175B31

square

#171F5B #5B1741 #5B5317 #175B31

split-complementary

#171F5B #5B3117 #415B17

monochromatic

#060818 #0B0E2A #171F5B #23308C #3040BD

Accessibility & contrast

On white

15.18

#171F5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.38

#171F5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171F5B

15.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171F5B	#FFFFFF	#000000	##FFFFFF
##171F5B	1.00	15.18	1.38	15.18
#FFFFFF	15.18	1.00	21.00	1.00
#000000	1.38	21.00	1.00	21.00
##FFFFFF	15.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00295D

Deuteranopia (green-blind)

#00235A

Tritanopia (blue-blind)

#002E39

Achromatopsia (no color)

#262626

Design tokens & code

CSS

--color: #171f5b;
/* rgb */ color: rgb(23, 31, 91);
/* oklch */ color: oklch(27.5% 0.107 271.6);

Tailwind

colors: {
  custom: {
    50: '#5f5a8a',
    500: '#171f5b',
    950: '#000000',
  },
}

SCSS

$custom: #171f5b;
$custom-light: #5f5a8a;
$custom-dark: #000000;

JSON

{
  "hex": "#171f5b",
  "rgb": {
    "r": 23,
    "g": 31,
    "b": 91
  },
  "hsl": {
    "h": 232.941,
    "s": 59.649,
    "l": 22.353
  },
  "oklch": {
    "l": 0.27528,
    "c": 0.107,
    "h": 271.6
  },
  "luminance": 0.01917
}

Semantic roles & 50–950 ramp

primary

#171F5B

secondary

#92883C

accent

#D045E3

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05030C

muted

#79787D

Preview Lab

Preview with #171F5B

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

Preview Lab → · Contrast checker → · Palette generator →