#171D51#171D51

#171D51 is a dark, moderate blue. Relative luminance 0.017; OKLCH L 26.1% C 0.094 H 273.0°. Best body text is #FFFFFF at 15.78:1 contrast (WCAG AA passes).

Color values

HEX	#171D51
RGB	rgb(23, 29, 81)
HSL	hsl(234, 56%, 20%)
HSV	hsv(234, 72%, 32%)
CMYK	cmyk(71.6%, 64.2%, 0%, 68.2%)
CIE-LAB	lab(13.56, 16.73, -32.74)
CIE-LCH	lch(13.56, 36.77, 297.07°)
OKLab	oklab(26.14% 0.0049 -0.0943)
OKLCH	oklch(26.14% 0.094 273)
XYZ	xyz(2.2774, 1.6548, 7.9824)
Luminance	0.0165 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 6.92

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171D51 #514B17

analogous

#173A51 #171D51 #2E1751

triadic

#171D51 #51171D #1D5117

tetradic

#171D51 #51173A #514B17 #17512E

square

#171D51 #51173A #514B17 #17512E

split-complementary

#171D51 #512E17 #3A5117

monochromatic

#070918 #090C21 #171D51 #252E81 #323FB0

Accessibility & contrast

On white

15.78

#171D51 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.33

#171D51 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171D51

15.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171D51	#FFFFFF	#000000	##FFFFFF
##171D51	1.00	15.78	1.33	15.78
#FFFFFF	15.78	1.00	21.00	1.00
#000000	1.33	21.00	1.00	21.00
##FFFFFF	15.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002553

Deuteranopia (green-blind)

#002050

Tritanopia (blue-blind)

#002A33

Achromatopsia (no color)

#232323

Design tokens & code

CSS

--color: #171d51;
/* rgb */ color: rgb(23, 29, 81);
/* oklch */ color: oklch(26.1% 0.094 273.0);

Tailwind

colors: {
  custom: {
    50: '#5c5882',
    500: '#171d51',
    950: '#000000',
  },
}

SCSS

$custom: #171d51;
$custom-light: #5c5882;
$custom-dark: #000000;

JSON

{
  "hex": "#171d51",
  "rgb": {
    "r": 23,
    "g": 29,
    "b": 81
  },
  "hsl": {
    "h": 233.793,
    "s": 55.769,
    "l": 20.392
  },
  "oklch": {
    "l": 0.26142,
    "c": 0.09439,
    "h": 273
  },
  "luminance": 0.01655
}

Semantic roles & 50–950 ramp

primary

#171D51

secondary

#88803C

accent

#D049DF

background

#F5F5F8

surface

#E9E9EF

border

#C5C5CA

text

#04030A

muted

#79787C

Preview Lab

Preview with #171D51

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

Preview Lab → · Contrast checker → · Palette generator →