#171B58#171B58

#171B58 is a dark, moderate blue. Relative luminance 0.017; OKLCH L 26.4% C 0.108 H 273.5°. Best body text is #FFFFFF at 15.74:1 contrast (WCAG AA passes).

Color values

HEX	#171B58
RGB	rgb(23, 27, 88)
HSL	hsl(236, 59%, 22%)
HSV	hsv(236, 74%, 35%)
CMYK	cmyk(73.9%, 69.3%, 0%, 65.5%)
CIE-LAB	lab(13.65, 21.00, -37.33)
CIE-LCH	lch(13.65, 42.84, 299.36°)
OKLab	oklab(26.41% 0.0065 -0.1078)
OKLCH	oklch(26.41% 0.108 273.5)
XYZ	xyz(2.5061, 1.6704, 9.4210)
Luminance	0.0167 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171B58 #585417

analogous

#173C58 #171B58 #341758

triadic

#171B58 #58171B #1B5817

tetradic

#171B58 #58173C #585417 #175834

square

#171B58 #58173C #585417 #175834

split-complementary

#171B58 #583417 #3C5817

monochromatic

#060718 #0A0C27 #171B58 #242A89 #3039B9

Accessibility & contrast

On white

15.74

#171B58 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.33

#171B58 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171B58

15.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171B58	#FFFFFF	#000000	##FFFFFF
##171B58	1.00	15.74	1.33	15.74
#FFFFFF	15.74	1.00	21.00	1.00
#000000	1.33	21.00	1.00	21.00
##FFFFFF	15.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00265A

Deuteranopia (green-blind)

#002057

Tritanopia (blue-blind)

#002B36

Achromatopsia (no color)

#232323

Design tokens & code

CSS

--color: #171b58;
/* rgb */ color: rgb(23, 27, 88);
/* oklch */ color: oklch(26.4% 0.108 273.5);

Tailwind

colors: {
  custom: {
    50: '#5e5788',
    500: '#171b58',
    950: '#000000',
  },
}

SCSS

$custom: #171b58;
$custom-light: #5e5788;
$custom-dark: #000000;

JSON

{
  "hex": "#171b58",
  "rgb": {
    "r": 23,
    "g": 27,
    "b": 88
  },
  "hsl": {
    "h": 236.308,
    "s": 58.559,
    "l": 21.765
  },
  "oklch": {
    "l": 0.26414,
    "c": 0.10796,
    "h": 273.5
  },
  "luminance": 0.01671
}

Semantic roles & 50–950 ramp

primary

#171B58

secondary

#8F8A3C

accent

#D846E2

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05030B

muted

#79787C

Preview Lab

Preview with #171B58

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

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