#1B3783#1B3783

#1B3783 is a dark, vivid blue. Relative luminance 0.046; OKLCH L 36.5% C 0.133 H 265.1°. Best body text is #FFFFFF at 10.93:1 contrast (WCAG AA passes).

Color values

HEX	#1B3783
RGB	rgb(27, 55, 131)
HSL	hsl(224, 66%, 31%)
HSV	hsv(224, 79%, 51%)
CMYK	cmyk(79.4%, 58%, 0%, 48.6%)
CIE-LAB	lab(25.57, 18.93, -45.76)
CIE-LCH	lch(25.57, 49.52, 292.47°)
OKLab	oklab(36.53% -0.0114 -0.132)
OKLCH	oklch(36.53% 0.133 265.1)
XYZ	xyz(5.9135, 4.6034, 22.0452)
Luminance	0.0460 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3783 #83671B

analogous

#1B6B83 #1B3783 #331B83

triadic

#1B3783 #831B37 #37831B

tetradic

#1B3783 #831B6B #83671B #1B8333

square

#1B3783 #831B6B #83671B #1B8333

split-complementary

#1B3783 #83331B #6B831B

monochromatic

#060C1E #112250 #1B3783 #254CB6 #4169D8

Accessibility & contrast

On white

10.93

#1B3783 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.92

#1B3783 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3783

10.93:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3783	#FFFFFF	#000000	##FFFFFF
##1B3783	1.00	10.93	1.92	10.93
#FFFFFF	10.93	1.00	21.00	1.00
#000000	1.92	21.00	1.00	21.00
##FFFFFF	10.93	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004286

Deuteranopia (green-blind)

#003882

Tritanopia (blue-blind)

#004A57

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1b3783;
/* rgb */ color: rgb(27, 55, 131);
/* oklch */ color: oklch(36.5% 0.133 265.1);

Tailwind

colors: {
  custom: {
    50: '#696da8',
    500: '#1b3783',
    950: '#000000',
  },
}

SCSS

$custom: #1b3783;
$custom-light: #696da8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3783",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 131
  },
  "hsl": {
    "h": 223.846,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.36529,
    "c": 0.13253,
    "h": 265.1
  },
  "luminance": 0.04604
}

Semantic roles & 50–950 ramp

primary

#1B3783

secondary

#B69743

accent

#BB3FE9

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #1B3783

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

Preview Lab → · Contrast checker → · Palette generator →