#1B3585#1B3585

#1B3585 is a dark, vivid blue. Relative luminance 0.045; OKLCH L 36.3% C 0.138 H 265.9°. Best body text is #FFFFFF at 11.08:1 contrast (WCAG AA passes).

Color values

HEX	#1B3585
RGB	rgb(27, 53, 133)
HSL	hsl(225, 66%, 31%)
HSV	hsv(225, 80%, 52%)
CMYK	cmyk(79.7%, 60.2%, 0%, 47.8%)
CIE-LAB	lab(25.17, 21.14, -47.66)
CIE-LCH	lch(25.17, 52.14, 293.92°)
OKLab	oklab(36.28% -0.0098 -0.1377)
OKLCH	oklch(36.28% 0.138 265.9)
XYZ	xyz(5.9572, 4.4720, 22.7350)
Luminance	0.0447 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3585 #856B1B

analogous

#1B6A85 #1B3585 #361B85

triadic

#1B3585 #851B35 #35851B

tetradic

#1B3585 #851B6A #856B1B #1B8536

square

#1B3585 #851B6A #856B1B #1B8536

split-complementary

#1B3585 #85361B #6A851B

monochromatic

#060C1F #112152 #1B3585 #2549B8 #4267D9

Accessibility & contrast

On white

11.08

#1B3585 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#1B3585 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3585

11.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3585	#FFFFFF	#000000	##FFFFFF
##1B3585	1.00	11.08	1.89	11.08
#FFFFFF	11.08	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.08	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004188

Deuteranopia (green-blind)

#003783

Tritanopia (blue-blind)

#004957

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1b3585;
/* rgb */ color: rgb(27, 53, 133);
/* oklch */ color: oklch(36.3% 0.138 265.9);

Tailwind

colors: {
  custom: {
    50: '#696ba9',
    500: '#1b3585',
    950: '#000000',
  },
}

SCSS

$custom: #1b3585;
$custom-light: #696ba9;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3585",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 133
  },
  "hsl": {
    "h": 225.283,
    "s": 66.25,
    "l": 31.373
  },
  "oklch": {
    "l": 0.36281,
    "c": 0.13801,
    "h": 265.9
  },
  "luminance": 0.04473
}

Semantic roles & 50–950 ramp

primary

#1B3585

secondary

#B89C44

accent

#BF3FE9

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#070610

muted

#7A7A7F

Preview Lab

Preview with #1B3585

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

Preview Lab → · Contrast checker → · Palette generator →