#1B3987#1B3987

#1B3987 is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.3% C 0.136 H 264.6°. Best body text is #FFFFFF at 10.60:1 contrast (WCAG AA passes).

Color values

HEX	#1B3987
RGB	rgb(27, 57, 135)
HSL	hsl(223, 67%, 32%)
HSV	hsv(223, 80%, 53%)
CMYK	cmyk(80%, 57.8%, 0%, 47.1%)
CIE-LAB	lab(26.47, 19.15, -46.80)
CIE-LCH	lch(26.47, 50.56, 292.25°)
OKLab	oklab(37.31% -0.0126 -0.135)
OKLCH	oklch(37.31% 0.136 264.6)
XYZ	xyz(6.2867, 4.9078, 23.5329)
Luminance	0.0491 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3987 #87691B

analogous

#1B6F87 #1B3987 #331B87

triadic

#1B3987 #871B39 #39871B

tetradic

#1B3987 #871B6F #87691B #1B8733

square

#1B3987 #871B6F #87691B #1B8733

split-complementary

#1B3987 #87331B #6F871B

monochromatic

#070E21 #112354 #1B3987 #254FBA #436DD9

Accessibility & contrast

On white

10.60

#1B3987 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#1B3987 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3987

10.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3987	#FFFFFF	#000000	##FFFFFF
##1B3987	1.00	10.60	1.98	10.60
#FFFFFF	10.60	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00448A

Deuteranopia (green-blind)

#003A85

Tritanopia (blue-blind)

#004C5A

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b3987;
/* rgb */ color: rgb(27, 57, 135);
/* oklch */ color: oklch(37.3% 0.136 264.6);

Tailwind

colors: {
  custom: {
    50: '#6a6eab',
    500: '#1b3987',
    950: '#000000',
  },
}

SCSS

$custom: #1b3987;
$custom-light: #6a6eab;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3987",
  "rgb": {
    "r": 27,
    "g": 57,
    "b": 135
  },
  "hsl": {
    "h": 223.333,
    "s": 66.667,
    "l": 31.765
  },
  "oklch": {
    "l": 0.37307,
    "c": 0.13564,
    "h": 264.6
  },
  "luminance": 0.04909
}

Semantic roles & 50–950 ramp

primary

#1B3987

secondary

#BA9944

accent

#BA3EEA

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #1B3987

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

Preview Lab → · Contrast checker → · Palette generator →