#1B3872#1B3872

#1B3872 is a dark, moderate blue. Relative luminance 0.043; OKLCH L 35.3% C 0.106 H 262.4°. Best body text is #FFFFFF at 11.32:1 contrast (WCAG AA passes).

Color values

HEX	#1B3872
RGB	rgb(27, 56, 114)
HSL	hsl(220, 62%, 28%)
HSV	hsv(220, 76%, 45%)
CMYK	cmyk(76.3%, 50.9%, 0%, 55.3%)
CIE-LAB	lab(24.56, 11.28, -36.66)
CIE-LCH	lch(24.56, 38.35, 287.10°)
OKLab	oklab(35.35% -0.0141 -0.1052)
OKLCH	oklch(35.35% 0.106 262.4)
XYZ	xyz(4.9023, 4.2757, 16.4833)
Luminance	0.0428 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3872 #72551B

analogous

#1B6372 #1B3872 #291B72

triadic

#1B3872 #721B38 #38721B

tetradic

#1B3872 #721B63 #72551B #1B7229

square

#1B3872 #721B63 #72551B #1B7229

split-complementary

#1B3872 #72291B #63721B

monochromatic

#060C19 #0F2041 #1B3872 #2750A3 #386AD0

Accessibility & contrast

On white

11.32

#1B3872 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#1B3872 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3872

11.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3872	#FFFFFF	#000000	##FFFFFF
##1B3872	1.00	11.32	1.86	11.32
#FFFFFF	11.32	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.32	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#173F74

Deuteranopia (green-blind)

#003771

Tritanopia (blue-blind)

#00464F

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1b3872;
/* rgb */ color: rgb(27, 56, 114);
/* oklch */ color: oklch(35.3% 0.106 262.4);

Tailwind

colors: {
  custom: {
    50: '#646e9b',
    500: '#1b3872',
    950: '#000000',
  },
}

SCSS

$custom: #1b3872;
$custom-light: #646e9b;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3872",
  "rgb": {
    "r": 27,
    "g": 56,
    "b": 114
  },
  "hsl": {
    "h": 220,
    "s": 61.702,
    "l": 27.647
  },
  "oklch": {
    "l": 0.35347,
    "c": 0.10618,
    "h": 262.4
  },
  "luminance": 0.04276
}

Semantic roles & 50–950 ramp

primary

#1B3872

secondary

#A78542

accent

#AF43E5

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #1B3872

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

Preview Lab → · Contrast checker → · Palette generator →