#1B3371#1B3371

#1B3371 is a dark, moderate blue. Relative luminance 0.038; OKLCH L 34.1% C 0.111 H 265.0°. Best body text is #FFFFFF at 11.94:1 contrast (WCAG AA passes).

Color values

HEX	#1B3371
RGB	rgb(27, 51, 113)
HSL	hsl(223, 61%, 27%)
HSV	hsv(223, 76%, 44%)
CMYK	cmyk(76.1%, 54.9%, 0%, 55.7%)
CIE-LAB	lab(22.97, 14.43, -38.58)
CIE-LCH	lch(22.97, 41.19, 290.50°)
OKLab	oklab(34.11% -0.0096 -0.111)
OKLCH	oklch(34.11% 0.111 265)
XYZ	xyz(4.6154, 3.7924, 16.1084)
Luminance	0.0379 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3371 #71591B

analogous

#1B5E71 #1B3371 #2E1B71

triadic

#1B3371 #711B33 #33711B

tetradic

#1B3371 #711B5E #71591B #1B712E

square

#1B3371 #711B5E #71591B #1B712E

split-complementary

#1B3371 #712E1B #5E711B

monochromatic

#060B19 #0F1D40 #1B3371 #2749A2 #3762CF

Accessibility & contrast

On white

11.94

#1B3371 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.76

#1B3371 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3371

11.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3371	#FFFFFF	#000000	##FFFFFF
##1B3371	1.00	11.94	1.76	11.94
#FFFFFF	11.94	1.00	21.00	1.00
#000000	1.76	21.00	1.00	21.00
##FFFFFF	11.94	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#093B73

Deuteranopia (green-blind)

#003370

Tritanopia (blue-blind)

#00424C

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1b3371;
/* rgb */ color: rgb(27, 51, 113);
/* oklch */ color: oklch(34.1% 0.111 265.0);

Tailwind

colors: {
  custom: {
    50: '#646a9a',
    500: '#1b3371',
    950: '#000000',
  },
}

SCSS

$custom: #1b3371;
$custom-light: #646a9a;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3371",
  "rgb": {
    "r": 27,
    "g": 51,
    "b": 113
  },
  "hsl": {
    "h": 223.256,
    "s": 61.429,
    "l": 27.451
  },
  "oklch": {
    "l": 0.34112,
    "c": 0.11142,
    "h": 265
  },
  "luminance": 0.03793
}

Semantic roles & 50–950 ramp

primary

#1B3371

secondary

#A68A42

accent

#B843E5

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060E

muted

#7A7A7E

Preview Lab

Preview with #1B3371

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

Preview Lab → · Contrast checker → · Palette generator →