#1B288E#1B288E

#1B288E is a dark, vivid blue. Relative luminance 0.037; OKLCH L 34.7% C 0.166 H 269.1°. Best body text is #FFFFFF at 12.06:1 contrast (WCAG AA passes).

Color values

HEX	#1B288E
RGB	rgb(27, 40, 142)
HSL	hsl(233, 68%, 33%)
HSV	hsv(233, 81%, 56%)
CMYK	cmyk(81%, 71.8%, 0%, 44.3%)
CIE-LAB	lab(22.66, 33.44, -57.39)
CIE-LCH	lch(22.66, 66.42, 300.23°)
OKLab	oklab(34.7% -0.0025 -0.1662)
OKLCH	oklch(34.7% 0.166 269.1)
XYZ	xyz(6.0916, 3.7029, 25.9796)
Luminance	0.0370 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B288E #8E811B

analogous

#1B618E #1B288E #471B8E

triadic

#1B288E #8E1B28 #288E1B

tetradic

#1B288E #8E1B61 #8E811B #1B8E47

square

#1B288E #8E1B61 #8E811B #1B8E47

split-complementary

#1B288E #8E471B #618E1B

monochromatic

#070B27 #111A5B #1B288E #2536C1 #4758DC

Accessibility & contrast

On white

12.06

#1B288E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.74

#1B288E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B288E

12.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B288E	#FFFFFF	#000000	##FFFFFF
##1B288E	1.00	12.06	1.74	12.06
#FFFFFF	12.06	1.00	21.00	1.00
#000000	1.74	21.00	1.00	21.00
##FFFFFF	12.06	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C91

Deuteranopia (green-blind)

#00318C

Tritanopia (blue-blind)

#004558

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #1b288e;
/* rgb */ color: rgb(27, 40, 142);
/* oklch */ color: oklch(34.7% 0.166 269.1);

Tailwind

colors: {
  custom: {
    50: '#6d62b0',
    500: '#1b288e',
    950: '#000000',
  },
}

SCSS

$custom: #1b288e;
$custom-light: #6d62b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b288e",
  "rgb": {
    "r": 27,
    "g": 40,
    "b": 142
  },
  "hsl": {
    "h": 233.217,
    "s": 68.047,
    "l": 33.137
  },
  "oklch": {
    "l": 0.34695,
    "c": 0.16624,
    "h": 269.1
  },
  "luminance": 0.03704
}

Semantic roles & 50–950 ramp

primary

#1B288E

secondary

#BEB047

accent

#D73DEB

background

#F7F5FB

surface

#EDEAF6

border

#C8C6D0

text

#080511

muted

#7B7980

Preview Lab

Preview with #1B288E

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

Preview Lab → · Contrast checker → · Palette generator →