#171B57#171B57

#171B57 is a dark, moderate blue. Relative luminance 0.017; OKLCH L 26.3% C 0.106 H 273.5°. Best body text is #FFFFFF at 15.78:1 contrast (WCAG AA passes).

Color values

HEX	#171B57
RGB	rgb(23, 27, 87)
HSL	hsl(236, 58%, 22%)
HSV	hsv(236, 74%, 34%)
CMYK	cmyk(73.6%, 69%, 0%, 65.9%)
CIE-LAB	lab(13.55, 20.61, -36.82)
CIE-LCH	lch(13.55, 42.19, 299.24°)
OKLab	oklab(26.31% 0.0066 -0.1062)
OKLCH	oklch(26.31% 0.106 273.5)
XYZ	xyz(2.4650, 1.6539, 9.2043)
Luminance	0.0165 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171B57 #575317

analogous

#173B57 #171B57 #331757

triadic

#171B57 #57171B #1B5717

tetradic

#171B57 #57173B #575317 #175733

square

#171B57 #57173B #575317 #175733

split-complementary

#171B57 #573317 #3B5717

monochromatic

#060818 #0A0C27 #171B57 #242A87 #3139B8

Accessibility & contrast

On white

15.78

#171B57 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.33

#171B57 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171B57

15.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171B57	#FFFFFF	#000000	##FFFFFF
##171B57	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)

#002659

Deuteranopia (green-blind)

#002056

Tritanopia (blue-blind)

#002A36

Achromatopsia (no color)

#232323

Design tokens & code

CSS

--color: #171b57;
/* rgb */ color: rgb(23, 27, 87);
/* oklch */ color: oklch(26.3% 0.106 273.5);

Tailwind

colors: {
  custom: {
    50: '#5e5787',
    500: '#171b57',
    950: '#000000',
  },
}

SCSS

$custom: #171b57;
$custom-light: #5e5787;
$custom-dark: #000000;

JSON

{
  "hex": "#171b57",
  "rgb": {
    "r": 23,
    "g": 27,
    "b": 87
  },
  "hsl": {
    "h": 236.25,
    "s": 58.182,
    "l": 21.569
  },
  "oklch": {
    "l": 0.26312,
    "c": 0.10645,
    "h": 273.5
  },
  "luminance": 0.01654
}

Semantic roles & 50–950 ramp

primary

#171B57

secondary

#8E893C

accent

#D846E1

background

#F5F5F8

surface

#EAE9EF

border

#C6C5CA

text

#05030B

muted

#79787C

Preview Lab

Preview with #171B57

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

Preview Lab → · Contrast checker → · Palette generator →