#1B3580#1B3580

#1B3580 is a dark, vivid blue. Relative luminance 0.043; OKLCH L 35.8% C 0.131 H 265.6°. Best body text is #FFFFFF at 11.24:1 contrast (WCAG AA passes).

Color values

HEX	#1B3580
RGB	rgb(27, 53, 128)
HSL	hsl(225, 65%, 30%)
HSV	hsv(225, 79%, 50%)
CMYK	cmyk(78.9%, 58.6%, 0%, 49.8%)
CIE-LAB	lab(24.76, 19.12, -45.21)
CIE-LCH	lch(24.76, 49.09, 292.92°)
OKLab	oklab(35.84% -0.0101 -0.1304)
OKLCH	oklch(35.84% 0.131 265.6)
XYZ	xyz(5.6200, 4.3371, 20.9588)
Luminance	0.0434 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3580 #80661B

analogous

#1B6880 #1B3580 #331B80

triadic

#1B3580 #801B35 #35801B

tetradic

#1B3580 #801B68 #80661B #1B8033

square

#1B3580 #801B68 #80661B #1B8033

split-complementary

#1B3580 #80331B #68801B

monochromatic

#060B1B #10204D #1B3580 #264AB3 #3F66D6

Accessibility & contrast

On white

11.24

#1B3580 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.87

#1B3580 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3580

11.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3580	#FFFFFF	#000000	##FFFFFF
##1B3580	1.00	11.24	1.87	11.24
#FFFFFF	11.24	1.00	21.00	1.00
#000000	1.87	21.00	1.00	21.00
##FFFFFF	11.24	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004083

Deuteranopia (green-blind)

#00367F

Tritanopia (blue-blind)

#004855

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1b3580;
/* rgb */ color: rgb(27, 53, 128);
/* oklch */ color: oklch(35.8% 0.131 265.6);

Tailwind

colors: {
  custom: {
    50: '#686ba5',
    500: '#1b3580',
    950: '#000000',
  },
}

SCSS

$custom: #1b3580;
$custom-light: #686ba5;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3580",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 128
  },
  "hsl": {
    "h": 224.554,
    "s": 65.161,
    "l": 30.392
  },
  "oklch": {
    "l": 0.35837,
    "c": 0.13084,
    "h": 265.6
  },
  "luminance": 0.04338
}

Semantic roles & 50–950 ramp

primary

#1B3580

secondary

#B49743

accent

#BD40E8

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B3580

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

Preview Lab → · Contrast checker → · Palette generator →