#1B287E#1B287E

#1B287E is a dark, vivid blue. Relative luminance 0.033; OKLCH L 33.0% C 0.145 H 269.6°. Best body text is #FFFFFF at 12.72:1 contrast (WCAG AA passes).

Color values

HEX	#1B287E
RGB	rgb(27, 40, 126)
HSL	hsl(232, 65%, 30%)
HSV	hsv(232, 79%, 49%)
CMYK	cmyk(78.6%, 68.3%, 0%, 50.6%)
CIE-LAB	lab(21.04, 27.37, -50.01)
CIE-LCH	lch(21.04, 57.01, 298.69°)
OKLab	oklab(33.03% -0.001 -0.1447)
OKLCH	oklch(33.03% 0.145 269.6)
XYZ	xyz(4.9754, 3.2564, 20.1010)
Luminance	0.0326 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B287E #7E711B

analogous

#1B5A7E #1B287E #3F1B7E

triadic

#1B287E #7E1B28 #287E1B

tetradic

#1B287E #7E1B5A #7E711B #1B7E3F

square

#1B287E #7E1B5A #7E711B #1B7E3F

split-complementary

#1B287E #7E3F1B #5A7E1B

monochromatic

#050819 #10184C #1B287E #2638B0 #3E52D6

Accessibility & contrast

On white

12.72

#1B287E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.65

#1B287E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B287E

12.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B287E	#FFFFFF	#000000	##FFFFFF
##1B287E	1.00	12.72	1.65	12.72
#FFFFFF	12.72	1.00	21.00	1.00
#000000	1.65	21.00	1.00	21.00
##FFFFFF	12.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003781

Deuteranopia (green-blind)

#002E7C

Tritanopia (blue-blind)

#003F4F

Achromatopsia (no color)

#333333

Design tokens & code

CSS

--color: #1b287e;
/* rgb */ color: rgb(27, 40, 126);
/* oklch */ color: oklch(33.0% 0.145 269.6);

Tailwind

colors: {
  custom: {
    50: '#6962a4',
    500: '#1b287e',
    950: '#000000',
  },
}

SCSS

$custom: #1b287e;
$custom-light: #6962a4;
$custom-dark: #000000;

JSON

{
  "hex": "#1b287e",
  "rgb": {
    "r": 27,
    "g": 40,
    "b": 126
  },
  "hsl": {
    "h": 232.121,
    "s": 64.706,
    "l": 30
  },
  "oklch": {
    "l": 0.33027,
    "c": 0.1447,
    "h": 269.6
  },
  "luminance": 0.03257
}

Semantic roles & 50–950 ramp

primary

#1B287E

secondary

#B2A343

accent

#D240E8

background

#F6F5FA

surface

#ECEAF4

border

#C7C6CE

text

#07050F

muted

#7A797F

Preview Lab

Preview with #1B287E

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

Preview Lab → · Contrast checker → · Palette generator →