#1B1F83#1B1F83

#1B1F83 is a dark, vivid blue. Relative luminance 0.029; OKLCH L 32.0% C 0.162 H 271.1°. Best body text is #FFFFFF at 13.37:1 contrast (WCAG AA passes).

Color values

HEX	#1B1F83
RGB	rgb(27, 31, 131)
HSL	hsl(238, 66%, 31%)
HSV	hsv(238, 79%, 51%)
CMYK	cmyk(79.4%, 76.3%, 0%, 48.6%)
CIE-LAB	lab(19.44, 35.06, -55.82)
CIE-LCH	lch(19.44, 65.92, 302.14°)
OKLab	oklab(32.03% 0.0031 -0.1616)
OKLCH	oklch(32.03% 0.162 271.1)
XYZ	xyz(5.0373, 2.8511, 21.7532)
Luminance	0.0285 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B1F83 #837F1B

analogous

#1B5383 #1B1F83 #4B1B83

triadic

#1B1F83 #831B1F #1F831B

tetradic

#1B1F83 #831B53 #837F1B #1B834B

square

#1B1F83 #831B53 #837F1B #1B834B

split-complementary

#1B1F83 #834B1B #53831B

monochromatic

#06071E #111350 #1B1F83 #252BB6 #4146D8

Accessibility & contrast

On white

13.37

#1B1F83 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.57

#1B1F83 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B1F83

13.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B1F83	#FFFFFF	#000000	##FFFFFF
##1B1F83	1.00	13.37	1.57	13.37
#FFFFFF	13.37	1.00	21.00	1.00
#000000	1.57	21.00	1.00	21.00
##FFFFFF	13.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003486

Deuteranopia (green-blind)

#002A81

Tritanopia (blue-blind)

#003C4F

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1b1f83;
/* rgb */ color: rgb(27, 31, 131);
/* oklch */ color: oklch(32.0% 0.162 271.1);

Tailwind

colors: {
  custom: {
    50: '#6b5ca8',
    500: '#1b1f83',
    950: '#000000',
  },
}

SCSS

$custom: #1b1f83;
$custom-light: #6b5ca8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b1f83",
  "rgb": {
    "r": 27,
    "g": 31,
    "b": 131
  },
  "hsl": {
    "h": 237.692,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.32027,
    "c": 0.16165,
    "h": 271.1
  },
  "luminance": 0.02852
}

Semantic roles & 50–950 ramp

primary

#1B1F83

secondary

#B6B243

accent

#E23FE9

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#080410

muted

#7B797F

Preview Lab

Preview with #1B1F83

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

Preview Lab → · Contrast checker → · Palette generator →