#1B1B83#1B1B83

#1B1B83 is a dark, vivid blue. Relative luminance 0.027; OKLCH L 31.4% C 0.166 H 271.6°. Best body text is #FFFFFF at 13.71:1 contrast (WCAG AA passes).

Color values

HEX	#1B1B83
RGB	rgb(27, 27, 131)
HSL	hsl(240, 66%, 31%)
HSV	hsv(240, 79%, 51%)
CMYK	cmyk(79.4%, 79.4%, 0%, 48.6%)
CIE-LAB	lab(18.61, 37.42, -57.20)
CIE-LCH	lch(18.61, 68.35, 303.20°)
OKLab	oklab(31.44% 0.0047 -0.1656)
OKLCH	oklch(31.44% 0.166 271.6)
XYZ	xyz(4.9393, 2.6550, 21.7205)
Luminance	0.0266 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B1B83 #83831B

analogous

#1B4F83 #1B1B83 #4F1B83

triadic

#1B1B83 #831B1B #1B831B

tetradic

#1B1B83 #831B4F #83831B #1B834F

square

#1B1B83 #831B4F #83831B #1B834F

split-complementary

#1B1B83 #834F1B #4F831B

monochromatic

#06061E #111150 #1B1B83 #2525B6 #4141D8

Accessibility & contrast

On white

13.71

#1B1B83 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.53

#1B1B83 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B1B83

13.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B1B83	#FFFFFF	#000000	##FFFFFF
##1B1B83	1.00	13.71	1.53	13.71
#FFFFFF	13.71	1.00	21.00	1.00
#000000	1.53	21.00	1.00	21.00
##FFFFFF	13.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003286

Deuteranopia (green-blind)

#002881

Tritanopia (blue-blind)

#003A4E

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #1b1b83;
/* rgb */ color: rgb(27, 27, 131);
/* oklch */ color: oklch(31.4% 0.166 271.6);

Tailwind

colors: {
  custom: {
    50: '#6b59a8',
    500: '#1b1b83',
    950: '#000000',
  },
}

SCSS

$custom: #1b1b83;
$custom-light: #6b59a8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b1b83",
  "rgb": {
    "r": 27,
    "g": 27,
    "b": 131
  },
  "hsl": {
    "h": 240,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.31439,
    "c": 0.16565,
    "h": 271.6
  },
  "luminance": 0.02656
}

Semantic roles & 50–950 ramp

primary

#1B1B83

secondary

#B6B643

accent

#E93FE9

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#080410

muted

#7B797F

Preview Lab

Preview with #1B1B83

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

Preview Lab → · Contrast checker → · Palette generator →