#1B288A#1B288A

#1B288A is a dark, vivid blue. Relative luminance 0.036; OKLCH L 34.3% C 0.161 H 269.3°. Best body text is #FFFFFF at 12.23:1 contrast (WCAG AA passes).

Color values

HEX	#1B288A
RGB	rgb(27, 40, 138)
HSL	hsl(233, 67%, 32%)
HSV	hsv(233, 80%, 54%)
CMYK	cmyk(80.4%, 71%, 0%, 45.9%)
CIE-LAB	lab(22.25, 31.95, -55.58)
CIE-LCH	lch(22.25, 64.11, 299.89°)
OKLab	oklab(34.27% -0.0021 -0.1609)
OKLCH	oklch(34.27% 0.161 269.3)
XYZ	xyz(5.7967, 3.5849, 24.4263)
Luminance	0.0359 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B288A #8A7D1B

analogous

#1B608A #1B288A #461B8A

triadic

#1B288A #8A1B28 #288A1B

tetradic

#1B288A #8A1B60 #8A7D1B #1B8A46

square

#1B288A #8A1B60 #8A7D1B #1B8A46

split-complementary

#1B288A #8A461B #608A1B

monochromatic

#070A24 #111957 #1B288A #2537BD #4556DB

Accessibility & contrast

On white

12.23

#1B288A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.72

#1B288A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B288A

12.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B288A	#FFFFFF	#000000	##FFFFFF
##1B288A	1.00	12.23	1.72	12.23
#FFFFFF	12.23	1.00	21.00	1.00
#000000	1.72	21.00	1.00	21.00
##FFFFFF	12.23	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003B8D

Deuteranopia (green-blind)

#003088

Tritanopia (blue-blind)

#004356

Achromatopsia (no color)

#353535

Design tokens & code

CSS

--color: #1b288a;
/* rgb */ color: rgb(27, 40, 138);
/* oklch */ color: oklch(34.3% 0.161 269.3);

Tailwind

colors: {
  custom: {
    50: '#6c62ad',
    500: '#1b288a',
    950: '#000000',
  },
}

SCSS

$custom: #1b288a;
$custom-light: #6c62ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1b288a",
  "rgb": {
    "r": 27,
    "g": 40,
    "b": 138
  },
  "hsl": {
    "h": 232.973,
    "s": 67.273,
    "l": 32.353
  },
  "oklch": {
    "l": 0.3427,
    "c": 0.16096,
    "h": 269.3
  },
  "luminance": 0.03586
}

Semantic roles & 50–950 ramp

primary

#1B288A

secondary

#BCAE45

accent

#D63EEA

background

#F7F5FA

surface

#EDEAF4

border

#C8C6CE

text

#080510

muted

#7B797F

Preview Lab

Preview with #1B288A

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

Preview Lab → · Contrast checker → · Palette generator →