#1B287F#1B287F

#1B287F is a dark, vivid blue. Relative luminance 0.033; OKLCH L 33.1% C 0.146 H 269.6°. Best body text is #FFFFFF at 12.68:1 contrast (WCAG AA passes).

Color values

HEX	#1B287F
RGB	rgb(27, 40, 127)
HSL	hsl(232, 65%, 30%)
HSV	hsv(232, 79%, 50%)
CMYK	cmyk(78.7%, 68.5%, 0%, 50.2%)
CIE-LAB	lab(21.14, 27.76, -50.49)
CIE-LCH	lch(21.14, 57.61, 298.80°)
OKLab	oklab(33.13% -0.0011 -0.1461)
OKLCH	oklch(33.13% 0.146 269.6)
XYZ	xyz(5.0402, 3.2823, 20.4425)
Luminance	0.0328 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B287F #7F721B

analogous

#1B5A7F #1B287F #401B7F

triadic

#1B287F #7F1B28 #287F1B

tetradic

#1B287F #7F1B5A #7F721B #1B7F40

square

#1B287F #7F1B5A #7F721B #1B7F40

split-complementary

#1B287F #7F401B #5A7F1B

monochromatic

#06081A #10184D #1B287F #2638B1 #3E52D6

Accessibility & contrast

On white

12.68

#1B287F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.66

#1B287F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B287F

12.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B287F	#FFFFFF	#000000	##FFFFFF
##1B287F	1.00	12.68	1.66	12.68
#FFFFFF	12.68	1.00	21.00	1.00
#000000	1.66	21.00	1.00	21.00
##FFFFFF	12.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003882

Deuteranopia (green-blind)

#002E7D

Tritanopia (blue-blind)

#003F50

Achromatopsia (no color)

#333333

Design tokens & code

CSS

--color: #1b287f;
/* rgb */ color: rgb(27, 40, 127);
/* oklch */ color: oklch(33.1% 0.146 269.6);

Tailwind

colors: {
  custom: {
    50: '#6962a5',
    500: '#1b287f',
    950: '#000000',
  },
}

SCSS

$custom: #1b287f;
$custom-light: #6962a5;
$custom-dark: #000000;

JSON

{
  "hex": "#1b287f",
  "rgb": {
    "r": 27,
    "g": 40,
    "b": 127
  },
  "hsl": {
    "h": 232.2,
    "s": 64.935,
    "l": 30.196
  },
  "oklch": {
    "l": 0.33129,
    "c": 0.14608,
    "h": 269.6
  },
  "luminance": 0.03283
}

Semantic roles & 50–950 ramp

primary

#1B287F

secondary

#B3A443

accent

#D240E8

background

#F6F5FA

surface

#ECEAF4

border

#C7C6CE

text

#07050F

muted

#7A797F

Preview Lab

Preview with #1B287F

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

Preview Lab → · Contrast checker → · Palette generator →