#171D4B#171D4B

#171D4B is a dark, moderate blue. Relative luminance 0.016; OKLCH L 25.6% C 0.085 H 273.3°. Best body text is #FFFFFF at 15.98:1 contrast (WCAG AA passes).

Color values

HEX	#171D4B
RGB	rgb(23, 29, 75)
HSL	hsl(233, 53%, 19%)
HSV	hsv(233, 69%, 29%)
CMYK	cmyk(69.3%, 61.3%, 0%, 70.6%)
CIE-LAB	lab(13.04, 14.29, -29.48)
CIE-LCH	lch(13.04, 32.76, 295.87°)
OKLab	oklab(25.59% 0.0048 -0.0847)
OKLCH	oklch(25.59% 0.085 273.3)
XYZ	xyz(2.0623, 1.5687, 6.8494)
Luminance	0.0157 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 6.62

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171D4B #4B4517

analogous

#17374B #171D4B #2B174B

triadic

#171D4B #4B171D #1D4B17

tetradic

#171D4B #4B1737 #4B4517 #174B2B

square

#171D4B #4B1737 #4B4517 #174B2B

split-complementary

#171D4B #4B2B17 #374B17

monochromatic

#070917 #090B1C #171D4B #252F7A #3441A9

Accessibility & contrast

On white

15.98

#171D4B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.31

#171D4B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171D4B

15.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171D4B	#FFFFFF	#000000	##FFFFFF
##171D4B	1.00	15.98	1.31	15.98
#FFFFFF	15.98	1.00	21.00	1.00
#000000	1.31	21.00	1.00	21.00
##FFFFFF	15.98	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00244D

Deuteranopia (green-blind)

#001F4A

Tritanopia (blue-blind)

#002830

Achromatopsia (no color)

#222222

Design tokens & code

CSS

--color: #171d4b;
/* rgb */ color: rgb(23, 29, 75);
/* oklch */ color: oklch(25.6% 0.085 273.3);

Tailwind

colors: {
  custom: {
    50: '#5b587e',
    500: '#171d4b',
    950: '#000000',
  },
}

SCSS

$custom: #171d4b;
$custom-light: #5b587e;
$custom-dark: #000000;

JSON

{
  "hex": "#171d4b",
  "rgb": {
    "r": 23,
    "g": 29,
    "b": 75
  },
  "hsl": {
    "h": 233.077,
    "s": 53.061,
    "l": 19.216
  },
  "oklch": {
    "l": 0.25589,
    "c": 0.0848,
    "h": 273.3
  },
  "luminance": 0.01569
}

Semantic roles & 50–950 ramp

primary

#171D4B

secondary

#827A3C

accent

#CC4BDC

background

#F5F5F7

surface

#E9E9EE

border

#C5C5C9

text

#04030A

muted

#79787C

Preview Lab

Preview with #171D4B

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

Preview Lab → · Contrast checker → · Palette generator →