#1B3183#1B3183

#1B3183 is a dark, vivid blue. Relative luminance 0.041; OKLCH L 35.3% C 0.140 H 267.1°. Best body text is #FFFFFF at 11.58:1 contrast (WCAG AA passes).

Color values

HEX	#1B3183
RGB	rgb(27, 49, 131)
HSL	hsl(227, 66%, 31%)
HSV	hsv(227, 79%, 51%)
CMYK	cmyk(79.4%, 62.6%, 0%, 48.6%)
CIE-LAB	lab(23.89, 23.13, -48.50)
CIE-LCH	lch(23.89, 53.73, 295.50°)
OKLab	oklab(35.27% -0.0071 -0.1402)
OKLCH	oklch(35.27% 0.14 267.1)
XYZ	xyz(5.6456, 4.0677, 21.9559)
Luminance	0.0407 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3183 #836D1B

analogous

#1B6583 #1B3183 #391B83

triadic

#1B3183 #831B31 #31831B

tetradic

#1B3183 #831B65 #836D1B #1B8339

square

#1B3183 #831B65 #836D1B #1B8339

split-complementary

#1B3183 #83391B #65831B

monochromatic

#060B1E #111E50 #1B3183 #2544B6 #4161D8

Accessibility & contrast

On white

11.58

#1B3183 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#1B3183 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3183

11.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3183	#FFFFFF	#000000	##FFFFFF
##1B3183	1.00	11.58	1.81	11.58
#FFFFFF	11.58	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003E86

Deuteranopia (green-blind)

#003481

Tritanopia (blue-blind)

#004655

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1b3183;
/* rgb */ color: rgb(27, 49, 131);
/* oklch */ color: oklch(35.3% 0.140 267.1);

Tailwind

colors: {
  custom: {
    50: '#6968a8',
    500: '#1b3183',
    950: '#000000',
  },
}

SCSS

$custom: #1b3183;
$custom-light: #6968a8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3183",
  "rgb": {
    "r": 27,
    "g": 49,
    "b": 131
  },
  "hsl": {
    "h": 227.308,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.35273,
    "c": 0.14035,
    "h": 267.1
  },
  "luminance": 0.04068
}

Semantic roles & 50–950 ramp

primary

#1B3183

secondary

#B69E43

accent

#C53FE9

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#070610

muted

#7A7A7F

Preview Lab

Preview with #1B3183

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

Preview Lab → · Contrast checker → · Palette generator →