#1B288D#1B288D

#1B288D is a dark, vivid blue. Relative luminance 0.037; OKLCH L 34.6% C 0.165 H 269.2°. Best body text is #FFFFFF at 12.11:1 contrast (WCAG AA passes).

Color values

HEX	#1B288D
RGB	rgb(27, 40, 141)
HSL	hsl(233, 68%, 33%)
HSV	hsv(233, 81%, 55%)
CMYK	cmyk(80.9%, 71.6%, 0%, 44.7%)
CIE-LAB	lab(22.56, 33.07, -56.94)
CIE-LCH	lch(22.56, 65.84, 300.15°)
OKLab	oklab(34.59% -0.0024 -0.1649)
OKLCH	oklch(34.59% 0.165 269.2)
XYZ	xyz(6.0169, 3.6730, 25.5860)
Luminance	0.0367 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B288D #8D801B

analogous

#1B618D #1B288D #471B8D

triadic

#1B288D #8D1B28 #288D1B

tetradic

#1B288D #8D1B61 #8D801B #1B8D47

square

#1B288D #8D1B61 #8D801B #1B8D47

split-complementary

#1B288D #8D471B #618D1B

monochromatic

#070B26 #11195A #1B288D #2537C0 #4758DC

Accessibility & contrast

On white

12.11

#1B288D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.73

#1B288D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B288D

12.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B288D	#FFFFFF	#000000	##FFFFFF
##1B288D	1.00	12.11	1.73	12.11
#FFFFFF	12.11	1.00	21.00	1.00
#000000	1.73	21.00	1.00	21.00
##FFFFFF	12.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003B90

Deuteranopia (green-blind)

#00308B

Tritanopia (blue-blind)

#004457

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #1b288d;
/* rgb */ color: rgb(27, 40, 141);
/* oklch */ color: oklch(34.6% 0.165 269.2);

Tailwind

colors: {
  custom: {
    50: '#6d62af',
    500: '#1b288d',
    950: '#000000',
  },
}

SCSS

$custom: #1b288d;
$custom-light: #6d62af;
$custom-dark: #000000;

JSON

{
  "hex": "#1b288d",
  "rgb": {
    "r": 27,
    "g": 40,
    "b": 141
  },
  "hsl": {
    "h": 233.158,
    "s": 67.857,
    "l": 32.941
  },
  "oklch": {
    "l": 0.34588,
    "c": 0.16493,
    "h": 269.2
  },
  "luminance": 0.03674
}

Semantic roles & 50–950 ramp

primary

#1B288D

secondary

#BDB046

accent

#D73DEB

background

#F7F5FA

surface

#EDEAF5

border

#C8C6CF

text

#080511

muted

#7B7980

Preview Lab

Preview with #1B288D

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

Preview Lab → · Contrast checker → · Palette generator →