#171D5B#171D5B

#171D5B is a dark, moderate blue. Relative luminance 0.018; OKLCH L 27.1% C 0.110 H 272.4°. Best body text is #FFFFFF at 15.40:1 contrast (WCAG AA passes).

Color values

HEX	#171D5B
RGB	rgb(23, 29, 91)
HSL	hsl(235, 60%, 22%)
HSV	hsv(235, 75%, 36%)
CMYK	cmyk(74.7%, 68.1%, 0%, 64.3%)
CIE-LAB	lab(14.49, 20.77, -37.98)
CIE-LCH	lch(14.49, 43.29, 298.67°)
OKLab	oklab(27.12% 0.0046 -0.1096)
OKLCH	oklch(27.12% 0.11 272.4)
XYZ	xyz(2.6804, 1.8160, 10.1048)
Luminance	0.0182 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171D5B #5B5517

analogous

#173F5B #171D5B #33175B

triadic

#171D5B #5B171D #1D5B17

tetradic

#171D5B #5B173F #5B5517 #175B33

square

#171D5B #5B173F #5B5517 #175B33

split-complementary

#171D5B #5B3317 #3F5B17

monochromatic

#060818 #0B0D2A #171D5B #232D8C #303CBD

Accessibility & contrast

On white

15.40

#171D5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.36

#171D5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171D5B

15.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171D5B	#FFFFFF	#000000	##FFFFFF
##171D5B	1.00	15.40	1.36	15.40
#FFFFFF	15.40	1.00	21.00	1.00
#000000	1.36	21.00	1.00	21.00
##FFFFFF	15.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00285D

Deuteranopia (green-blind)

#00225A

Tritanopia (blue-blind)

#002D39

Achromatopsia (no color)

#252525

Design tokens & code

CSS

--color: #171d5b;
/* rgb */ color: rgb(23, 29, 91);
/* oklch */ color: oklch(27.1% 0.110 272.4);

Tailwind

colors: {
  custom: {
    50: '#5f598a',
    500: '#171d5b',
    950: '#000000',
  },
}

SCSS

$custom: #171d5b;
$custom-light: #5f598a;
$custom-dark: #000000;

JSON

{
  "hex": "#171d5b",
  "rgb": {
    "r": 23,
    "g": 29,
    "b": 91
  },
  "hsl": {
    "h": 234.706,
    "s": 59.649,
    "l": 22.353
  },
  "oklch": {
    "l": 0.27118,
    "c": 0.10974,
    "h": 272.4
  },
  "luminance": 0.01816
}

Semantic roles & 50–950 ramp

primary

#171D5B

secondary

#928A3C

accent

#D545E3

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05030C

muted

#79787D

Preview Lab

Preview with #171D5B

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

Preview Lab → · Contrast checker → · Palette generator →