#1B3584#1B3584

#1B3584 is a dark, vivid blue. Relative luminance 0.044; OKLCH L 36.2% C 0.137 H 265.9°. Best body text is #FFFFFF at 11.12:1 contrast (WCAG AA passes).

Color values

HEX	#1B3584
RGB	rgb(27, 53, 132)
HSL	hsl(225, 66%, 31%)
HSV	hsv(225, 80%, 52%)
CMYK	cmyk(79.5%, 59.8%, 0%, 48.2%)
CIE-LAB	lab(25.09, 20.73, -47.17)
CIE-LCH	lch(25.09, 51.53, 293.73°)
OKLab	oklab(36.19% -0.0099 -0.1362)
OKLCH	oklch(36.19% 0.137 265.9)
XYZ	xyz(5.8885, 4.4445, 22.3729)
Luminance	0.0445 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3584 #846A1B

analogous

#1B6984 #1B3584 #351B84

triadic

#1B3584 #841B35 #35841B

tetradic

#1B3584 #841B69 #846A1B #1B8435

square

#1B3584 #841B69 #846A1B #1B8435

split-complementary

#1B3584 #84351B #69841B

monochromatic

#060C1E #112151 #1B3584 #2549B7 #4167D8

Accessibility & contrast

On white

11.12

#1B3584 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#1B3584 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3584

11.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3584	#FFFFFF	#000000	##FFFFFF
##1B3584	1.00	11.12	1.89	11.12
#FFFFFF	11.12	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.12	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004187

Deuteranopia (green-blind)

#003782

Tritanopia (blue-blind)

#004957

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1b3584;
/* rgb */ color: rgb(27, 53, 132);
/* oklch */ color: oklch(36.2% 0.137 265.9);

Tailwind

colors: {
  custom: {
    50: '#696ba8',
    500: '#1b3584',
    950: '#000000',
  },
}

SCSS

$custom: #1b3584;
$custom-light: #696ba8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3584",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 132
  },
  "hsl": {
    "h": 225.143,
    "s": 66.038,
    "l": 31.176
  },
  "oklch": {
    "l": 0.36192,
    "c": 0.13659,
    "h": 265.9
  },
  "luminance": 0.04445
}

Semantic roles & 50–950 ramp

primary

#1B3584

secondary

#B79B43

accent

#BF3FE9

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#070610

muted

#7A7A7F

Preview Lab

Preview with #1B3584

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

Preview Lab → · Contrast checker → · Palette generator →