#1B3787#1B3787

#1B3787 is a dark, vivid blue. Relative luminance 0.047; OKLCH L 36.9% C 0.138 H 265.4°. Best body text is #FFFFFF at 10.81:1 contrast (WCAG AA passes).

Color values

HEX	#1B3787
RGB	rgb(27, 55, 135)
HSL	hsl(224, 67%, 32%)
HSV	hsv(224, 80%, 53%)
CMYK	cmyk(80%, 59.3%, 0%, 47.1%)
CIE-LAB	lab(25.90, 20.54, -47.72)
CIE-LCH	lch(25.90, 51.96, 293.29°)
OKLab	oklab(36.88% -0.0112 -0.1378)
OKLCH	oklch(36.88% 0.138 265.4)
XYZ	xyz(6.1898, 4.7139, 23.5006)
Luminance	0.0471 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3787 #876B1B

analogous

#1B6D87 #1B3787 #351B87

triadic

#1B3787 #871B37 #37871B

tetradic

#1B3787 #871B6D #876B1B #1B8735

square

#1B3787 #871B6D #876B1B #1B8735

split-complementary

#1B3787 #87351B #6D871B

monochromatic

#070D21 #112254 #1B3787 #254CBA #436AD9

Accessibility & contrast

On white

10.81

#1B3787 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.94

#1B3787 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3787

10.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3787	#FFFFFF	#000000	##FFFFFF
##1B3787	1.00	10.81	1.94	10.81
#FFFFFF	10.81	1.00	21.00	1.00
#000000	1.94	21.00	1.00	21.00
##FFFFFF	10.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00438A

Deuteranopia (green-blind)

#003985

Tritanopia (blue-blind)

#004B59

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1b3787;
/* rgb */ color: rgb(27, 55, 135);
/* oklch */ color: oklch(36.9% 0.138 265.4);

Tailwind

colors: {
  custom: {
    50: '#6a6dab',
    500: '#1b3787',
    950: '#000000',
  },
}

SCSS

$custom: #1b3787;
$custom-light: #6a6dab;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3787",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 135
  },
  "hsl": {
    "h": 224.444,
    "s": 66.667,
    "l": 31.765
  },
  "oklch": {
    "l": 0.36881,
    "c": 0.13825,
    "h": 265.4
  },
  "luminance": 0.04715
}

Semantic roles & 50–950 ramp

primary

#1B3787

secondary

#BA9B44

accent

#BD3EEA

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #1B3787

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

Preview Lab → · Contrast checker → · Palette generator →