#1B3281#1B3281

#1B3281 is a dark, vivid blue. Relative luminance 0.041; OKLCH L 35.3% C 0.136 H 266.7°. Best body text is #FFFFFF at 11.54:1 contrast (WCAG AA passes).

Color values

HEX	#1B3281
RGB	rgb(27, 50, 129)
HSL	hsl(226, 65%, 31%)
HSV	hsv(226, 79%, 51%)
CMYK	cmyk(79.1%, 61.2%, 0%, 49.4%)
CIE-LAB	lab(23.99, 21.63, -47.08)
CIE-LCH	lch(23.99, 51.81, 294.68°)
OKLab	oklab(35.29% -0.0078 -0.136)
OKLCH	oklch(35.29% 0.136 266.7)
XYZ	xyz(5.5537, 4.0986, 21.2630)
Luminance	0.0410 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3281 #816A1B

analogous

#1B6581 #1B3281 #371B81

triadic

#1B3281 #811B32 #32811B

tetradic

#1B3281 #811B65 #816A1B #1B8137

square

#1B3281 #811B65 #816A1B #1B8137

split-complementary

#1B3281 #81371B #65811B

monochromatic

#060B1C #101E4E #1B3281 #2646B4 #3F62D7

Accessibility & contrast

On white

11.54

#1B3281 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.82

#1B3281 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3281

11.54:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3281	#FFFFFF	#000000	##FFFFFF
##1B3281	1.00	11.54	1.82	11.54
#FFFFFF	11.54	1.00	21.00	1.00
#000000	1.82	21.00	1.00	21.00
##FFFFFF	11.54	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003E84

Deuteranopia (green-blind)

#00347F

Tritanopia (blue-blind)

#004654

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1b3281;
/* rgb */ color: rgb(27, 50, 129);
/* oklch */ color: oklch(35.3% 0.136 266.7);

Tailwind

colors: {
  custom: {
    50: '#6969a6',
    500: '#1b3281',
    950: '#000000',
  },
}

SCSS

$custom: #1b3281;
$custom-light: #6969a6;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3281",
  "rgb": {
    "r": 27,
    "g": 50,
    "b": 129
  },
  "hsl": {
    "h": 226.471,
    "s": 65.385,
    "l": 30.588
  },
  "oklch": {
    "l": 0.35293,
    "c": 0.13621,
    "h": 266.7
  },
  "luminance": 0.04099
}

Semantic roles & 50–950 ramp

primary

#1B3281

secondary

#B59B43

accent

#C23FE8

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B3281

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

Preview Lab → · Contrast checker → · Palette generator →