#1B3471#1B3471

#1B3471 is a dark, moderate blue. Relative luminance 0.039; OKLCH L 34.3% C 0.110 H 264.5°. Best body text is #FFFFFF at 11.82:1 contrast (WCAG AA passes).

Color values

HEX	#1B3471
RGB	rgb(27, 52, 113)
HSL	hsl(223, 61%, 27%)
HSV	hsv(223, 76%, 44%)
CMYK	cmyk(76.1%, 54%, 0%, 55.7%)
CIE-LAB	lab(23.27, 13.71, -38.10)
CIE-LCH	lch(23.27, 40.49, 289.80°)
OKLab	oklab(34.34% -0.0105 -0.1095)
OKLCH	oklch(34.34% 0.11 264.5)
XYZ	xyz(4.6596, 3.8808, 16.1231)
Luminance	0.0388 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3471 #71581B

analogous

#1B5F71 #1B3471 #2D1B71

triadic

#1B3471 #711B34 #34711B

tetradic

#1B3471 #711B5F #71581B #1B712D

square

#1B3471 #711B5F #71581B #1B712D

split-complementary

#1B3471 #712D1B #5F711B

monochromatic

#060B19 #0F1D40 #1B3471 #274BA2 #3763CF

Accessibility & contrast

On white

11.82

#1B3471 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.78

#1B3471 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3471

11.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3471	#FFFFFF	#000000	##FFFFFF
##1B3471	1.00	11.82	1.78	11.82
#FFFFFF	11.82	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0D3C73

Deuteranopia (green-blind)

#003470

Tritanopia (blue-blind)

#00434D

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1b3471;
/* rgb */ color: rgb(27, 52, 113);
/* oklch */ color: oklch(34.3% 0.110 264.5);

Tailwind

colors: {
  custom: {
    50: '#646b9a',
    500: '#1b3471',
    950: '#000000',
  },
}

SCSS

$custom: #1b3471;
$custom-light: #646b9a;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3471",
  "rgb": {
    "r": 27,
    "g": 52,
    "b": 113
  },
  "hsl": {
    "h": 222.558,
    "s": 61.429,
    "l": 27.451
  },
  "oklch": {
    "l": 0.3434,
    "c": 0.11005,
    "h": 264.5
  },
  "luminance": 0.03881
}

Semantic roles & 50–950 ramp

primary

#1B3471

secondary

#A68942

accent

#B643E5

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060E

muted

#7A7A7E

Preview Lab

Preview with #1B3471

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

Preview Lab → · Contrast checker → · Palette generator →