#1B287B#1B287B

#1B287B is a dark, vivid blue. Relative luminance 0.032; OKLCH L 32.7% C 0.141 H 269.7°. Best body text is #FFFFFF at 12.83:1 contrast (WCAG AA passes).

Color values

HEX	#1B287B
RGB	rgb(27, 40, 123)
HSL	hsl(232, 64%, 29%)
HSV	hsv(232, 78%, 48%)
CMYK	cmyk(78%, 67.5%, 0%, 51.8%)
CIE-LAB	lab(20.75, 26.21, -48.59)
CIE-LCH	lch(20.75, 55.20, 298.34°)
OKLab	oklab(32.73% -0.0008 -0.1405)
OKLCH	oklch(32.73% 0.141 269.7)
XYZ	xyz(4.7847, 3.1801, 19.0967)
Luminance	0.0318 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B287B #7B6E1B

analogous

#1B587B #1B287B #3E1B7B

triadic

#1B287B #7B1B28 #287B1B

tetradic

#1B287B #7B1B58 #7B6E1B #1B7B3E

square

#1B287B #7B1B58 #7B6E1B #1B7B3E

split-complementary

#1B287B #7B3E1B #587B1B

monochromatic

#060819 #101849 #1B287B #2638AD #3C51D4

Accessibility & contrast

On white

12.83

#1B287B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.64

#1B287B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B287B

12.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B287B	#FFFFFF	#000000	##FFFFFF
##1B287B	1.00	12.83	1.64	12.83
#FFFFFF	12.83	1.00	21.00	1.00
#000000	1.64	21.00	1.00	21.00
##FFFFFF	12.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00377E

Deuteranopia (green-blind)

#002D79

Tritanopia (blue-blind)

#003E4D

Achromatopsia (no color)

#323232

Design tokens & code

CSS

--color: #1b287b;
/* rgb */ color: rgb(27, 40, 123);
/* oklch */ color: oklch(32.7% 0.141 269.7);

Tailwind

colors: {
  custom: {
    50: '#6862a2',
    500: '#1b287b',
    950: '#000000',
  },
}

SCSS

$custom: #1b287b;
$custom-light: #6862a2;
$custom-dark: #000000;

JSON

{
  "hex": "#1b287b",
  "rgb": {
    "r": 27,
    "g": 40,
    "b": 123
  },
  "hsl": {
    "h": 231.875,
    "s": 64,
    "l": 29.412
  },
  "oklch": {
    "l": 0.32725,
    "c": 0.14053,
    "h": 269.7
  },
  "luminance": 0.03181
}

Semantic roles & 50–950 ramp

primary

#1B287B

secondary

#AFA043

accent

#D141E7

background

#F6F5FA

surface

#ECEAF4

border

#C7C6CE

text

#07050F

muted

#7A797F

Preview Lab

Preview with #1B287B

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

Preview Lab → · Contrast checker → · Palette generator →