#1B1C83#1B1C83

#1B1C83 is a dark, vivid blue. Relative luminance 0.027; OKLCH L 31.6% C 0.165 H 271.5°. Best body text is #FFFFFF at 13.63:1 contrast (WCAG AA passes).

Color values

HEX	#1B1C83
RGB	rgb(27, 28, 131)
HSL	hsl(239, 66%, 31%)
HSV	hsv(239, 79%, 51%)
CMYK	cmyk(79.4%, 78.6%, 0%, 48.6%)
CIE-LAB	lab(18.81, 36.85, -56.86)
CIE-LCH	lch(18.81, 67.76, 302.94°)
OKLab	oklab(31.58% 0.0043 -0.1646)
OKLCH	oklch(31.58% 0.165 271.5)
XYZ	xyz(4.9626, 2.7017, 21.7283)
Luminance	0.0270 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B1C83 #83821B

analogous

#1B5083 #1B1C83 #4E1B83

triadic

#1B1C83 #831B1C #1C831B

tetradic

#1B1C83 #831B50 #83821B #1B834E

square

#1B1C83 #831B50 #83821B #1B834E

split-complementary

#1B1C83 #834E1B #50831B

monochromatic

#06061E #111150 #1B1C83 #2527B6 #4142D8

Accessibility & contrast

On white

13.63

#1B1C83 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.54

#1B1C83 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B1C83

13.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B1C83	#FFFFFF	#000000	##FFFFFF
##1B1C83	1.00	13.63	1.54	13.63
#FFFFFF	13.63	1.00	21.00	1.00
#000000	1.54	21.00	1.00	21.00
##FFFFFF	13.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003386

Deuteranopia (green-blind)

#002881

Tritanopia (blue-blind)

#003B4E

Achromatopsia (no color)

#2E2E2E

Design tokens & code

CSS

--color: #1b1c83;
/* rgb */ color: rgb(27, 28, 131);
/* oklch */ color: oklch(31.6% 0.165 271.5);

Tailwind

colors: {
  custom: {
    50: '#6b5aa8',
    500: '#1b1c83',
    950: '#000000',
  },
}

SCSS

$custom: #1b1c83;
$custom-light: #6b5aa8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b1c83",
  "rgb": {
    "r": 27,
    "g": 28,
    "b": 131
  },
  "hsl": {
    "h": 239.423,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.31581,
    "c": 0.16468,
    "h": 271.5
  },
  "luminance": 0.02702
}

Semantic roles & 50–950 ramp

primary

#1B1C83

secondary

#B6B543

accent

#E73FE9

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#080410

muted

#7B797F

Preview Lab

Preview with #1B1C83

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

Preview Lab → · Contrast checker → · Palette generator →