#1B1789#1B1789

#1B1789 is a dark, vivid blue. Relative luminance 0.027; OKLCH L 31.6% C 0.177 H 271.5°. Best body text is #FFFFFF at 13.72:1 contrast (WCAG AA passes).

Color values

HEX	#1B1789
RGB	rgb(27, 23, 137)
HSL	hsl(242, 71%, 31%)
HSV	hsv(242, 83%, 54%)
CMYK	cmyk(80.3%, 83.2%, 0%, 46.3%)
CIE-LAB	lab(18.59, 41.59, -61.00)
CIE-LCH	lch(18.59, 73.83, 304.29°)
OKLab	oklab(31.64% 0.0046 -0.1766)
OKLCH	oklch(31.64% 0.177 271.5)
XYZ	xyz(5.2722, 2.6514, 23.8960)
Luminance	0.0265 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B1789 #858917

analogous

#174C89 #1B1789 #541789

triadic

#1B1789 #891B17 #17891B

tetradic

#1B1789 #89174C #858917 #178954

square

#1B1789 #89174C #858917 #178954

split-complementary

#1B1789 #895417 #4C8917

monochromatic

#060520 #110E55 #1B1789 #2520BD #423CDE

Accessibility & contrast

On white

13.72

#1B1789 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.53

#1B1789 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B1789

13.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B1789	#FFFFFF	#000000	##FFFFFF
##1B1789	1.00	13.72	1.53	13.72
#FFFFFF	13.72	1.00	21.00	1.00
#000000	1.53	21.00	1.00	21.00
##FFFFFF	13.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00338C

Deuteranopia (green-blind)

#002787

Tritanopia (blue-blind)

#003B51

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #1b1789;
/* rgb */ color: rgb(27, 23, 137);
/* oklch */ color: oklch(31.6% 0.177 271.5);

Tailwind

colors: {
  custom: {
    50: '#6e57ad',
    500: '#1b1789',
    950: '#000000',
  },
}

SCSS

$custom: #1b1789;
$custom-light: #6e57ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1b1789",
  "rgb": {
    "r": 27,
    "g": 23,
    "b": 137
  },
  "hsl": {
    "h": 242.105,
    "s": 71.25,
    "l": 31.373
  },
  "oklch": {
    "l": 0.31639,
    "c": 0.17661,
    "h": 271.5
  },
  "luminance": 0.02652
}

Semantic roles & 50–950 ramp

primary

#1B1789

secondary

#B8BD3F

accent

#EE3AE8

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#080310

muted

#7B787F

Preview Lab

Preview with #1B1789

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

Preview Lab → · Contrast checker → · Palette generator →