#1D178A#1D178A

#1D178A is a dark, vivid blue. Relative luminance 0.027; OKLCH L 31.9% C 0.177 H 272.2°. Best body text is #FFFFFF at 13.62:1 contrast (WCAG AA passes).

Color values

HEX	#1D178A
RGB	rgb(29, 23, 138)
HSL	hsl(243, 71%, 32%)
HSV	hsv(243, 83%, 54%)
CMYK	cmyk(79%, 83.3%, 0%, 45.9%)
CIE-LAB	lab(18.84, 42.05, -61.22)
CIE-LCH	lch(18.84, 74.27, 304.48°)
OKLab	oklab(31.88% 0.0069 -0.1771)
OKLCH	oklch(31.88% 0.177 272.2)
XYZ	xyz(5.3990, 2.7084, 24.2781)
Luminance	0.0271 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1D178A #848A17

analogous

#174B8A #1D178A #57178A

triadic

#1D178A #8A1D17 #178A1D

tetradic

#1D178A #8A174B #848A17 #178A57

square

#1D178A #8A174B #848A17 #178A57

split-complementary

#1D178A #8A5717 #4B8A17

monochromatic

#070621 #120E56 #1D178A #2820BE #453DDF

Accessibility & contrast

On white

13.62

#1D178A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.54

#1D178A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1D178A

13.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1D178A	#FFFFFF	#000000	##FFFFFF
##1D178A	1.00	13.62	1.54	13.62
#FFFFFF	13.62	1.00	21.00	1.00
#000000	1.54	21.00	1.00	21.00
##FFFFFF	13.62	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00338D

Deuteranopia (green-blind)

#002888

Tritanopia (blue-blind)

#003C51

Achromatopsia (no color)

#2E2E2E

Design tokens & code

CSS

--color: #1d178a;
/* rgb */ color: rgb(29, 23, 138);
/* oklch */ color: oklch(31.9% 0.177 272.2);

Tailwind

colors: {
  custom: {
    50: '#6e58ad',
    500: '#1d178a',
    950: '#000000',
  },
}

SCSS

$custom: #1d178a;
$custom-light: #6e58ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1d178a",
  "rgb": {
    "r": 29,
    "g": 23,
    "b": 138
  },
  "hsl": {
    "h": 243.13,
    "s": 71.429,
    "l": 31.569
  },
  "oklch": {
    "l": 0.31879,
    "c": 0.17726,
    "h": 272.2
  },
  "luminance": 0.02709
}

Semantic roles & 50–950 ramp

primary

#1D178A

secondary

#B7BE3F

accent

#EE3AE5

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#090310

muted

#7B787F

Preview Lab

Preview with #1D178A

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

Preview Lab → · Contrast checker → · Palette generator →