#171B78#171B78

#171B78 is a dark, vivid blue. Relative luminance 0.023; OKLCH L 29.9% C 0.153 H 270.8°. Best body text is #FFFFFF at 14.34:1 contrast (WCAG AA passes).

Color values

HEX	#171B78
RGB	rgb(23, 27, 120)
HSL	hsl(238, 68%, 28%)
HSV	hsv(238, 81%, 47%)
CMYK	cmyk(80.8%, 77.5%, 0%, 52.9%)
CIE-LAB	lab(17.09, 33.21, -52.70)
CIE-LCH	lch(17.09, 62.29, 302.21°)
OKLab	oklab(29.93% 0.0021 -0.1526)
OKLCH	oklch(29.93% 0.153 270.8)
XYZ	xyz(4.1343, 2.3216, 17.9959)
Luminance	0.0232 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171B78 #787417

analogous

#174B78 #171B78 #431778

triadic

#171B78 #78171B #1B7817

tetradic

#171B78 #78174B #787417 #177843

square

#171B78 #78174B #787417 #177843

split-complementary

#171B78 #784317 #4B7817

monochromatic

#05061A #0D0F45 #171B78 #2127AB #3239D8

Accessibility & contrast

On white

14.34

#171B78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.46

#171B78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171B78

14.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171B78	#FFFFFF	#000000	##FFFFFF
##171B78	1.00	14.34	1.46	14.34
#FFFFFF	14.34	1.00	21.00	1.00
#000000	1.46	21.00	1.00	21.00
##FFFFFF	14.34	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002F7B

Deuteranopia (green-blind)

#002576

Tritanopia (blue-blind)

#003648

Achromatopsia (no color)

#2A2A2A

Design tokens & code

CSS

--color: #171b78;
/* rgb */ color: rgb(23, 27, 120);
/* oklch */ color: oklch(29.9% 0.153 270.8);

Tailwind

colors: {
  custom: {
    50: '#6758a0',
    500: '#171b78',
    950: '#000000',
  },
}

SCSS

$custom: #171b78;
$custom-light: #6758a0;
$custom-dark: #000000;

JSON

{
  "hex": "#171b78",
  "rgb": {
    "r": 23,
    "g": 27,
    "b": 120
  },
  "hsl": {
    "h": 237.526,
    "s": 67.832,
    "l": 28.039
  },
  "oklch": {
    "l": 0.29928,
    "c": 0.15263,
    "h": 270.8
  },
  "luminance": 0.02322
}

Semantic roles & 50–950 ramp

primary

#171B78

secondary

#ADA93E

accent

#E43DEB

background

#F6F5FA

surface

#ECE9F3

border

#C7C5CD

text

#07030F

muted

#7A787F

Preview Lab

Preview with #171B78

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

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