#1D178E#1D178E

#1D178E is a dark, vivid blue. Relative luminance 0.028; OKLCH L 32.4% C 0.182 H 271.9°. Best body text is #FFFFFF at 13.42:1 contrast (WCAG AA passes).

Color values

HEX	#1D178E
RGB	rgb(29, 23, 142)
HSL	hsl(243, 72%, 32%)
HSV	hsv(243, 84%, 56%)
CMYK	cmyk(79.6%, 83.8%, 0%, 44.3%)
CIE-LAB	lab(19.33, 43.34, -62.89)
CIE-LCH	lch(19.33, 76.37, 304.57°)
OKLab	oklab(32.37% 0.0059 -0.182)
OKLCH	oklch(32.37% 0.182 271.9)
XYZ	xyz(5.6939, 2.8264, 25.8314)
Luminance	0.0283 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1D178E #888E17

analogous

#174D8E #1D178E #58178E

triadic

#1D178E #8E1D17 #178E1D

tetradic

#1D178E #8E174D #888E17 #178E58

square

#1D178E #8E174D #888E17 #178E58

split-complementary

#1D178E #8E5817 #4D8E17

monochromatic

#070625 #120E59 #1D178E #2820C3 #483FE0

Accessibility & contrast

On white

13.42

#1D178E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.57

#1D178E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1D178E

13.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1D178E	#FFFFFF	#000000	##FFFFFF
##1D178E	1.00	13.42	1.57	13.42
#FFFFFF	13.42	1.00	21.00	1.00
#000000	1.57	21.00	1.00	21.00
##FFFFFF	13.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003591

Deuteranopia (green-blind)

#00298C

Tritanopia (blue-blind)

#003D54

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1d178e;
/* rgb */ color: rgb(29, 23, 142);
/* oklch */ color: oklch(32.4% 0.182 271.9);

Tailwind

colors: {
  custom: {
    50: '#6f58b0',
    500: '#1d178e',
    950: '#000000',
  },
}

SCSS

$custom: #1d178e;
$custom-light: #6f58b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1d178e",
  "rgb": {
    "r": 29,
    "g": 23,
    "b": 142
  },
  "hsl": {
    "h": 243.025,
    "s": 72.121,
    "l": 32.353
  },
  "oklch": {
    "l": 0.32368,
    "c": 0.18208,
    "h": 271.9
  },
  "luminance": 0.02827
}

Semantic roles & 50–950 ramp

primary

#1D178E

secondary

#BAC040

accent

#EF39E6

background

#F7F5FB

surface

#EDE9F6

border

#C8C5D0

text

#090311

muted

#7B7880

Preview Lab

Preview with #1D178E

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

Preview Lab → · Contrast checker → · Palette generator →