#1B3573#1B3573

#1B3573 is a dark, moderate blue. Relative luminance 0.040; OKLCH L 34.7% C 0.112 H 264.2°. Best body text is #FFFFFF at 11.64:1 contrast (WCAG AA passes).

Color values

HEX	#1B3573
RGB	rgb(27, 53, 115)
HSL	hsl(222, 62%, 28%)
HSV	hsv(222, 77%, 45%)
CMYK	cmyk(76.5%, 53.9%, 0%, 54.9%)
CIE-LAB	lab(23.73, 13.82, -38.64)
CIE-LCH	lch(23.73, 41.04, 289.68°)
OKLab	oklab(34.73% -0.0112 -0.1111)
OKLCH	oklch(34.73% 0.112 264.2)
XYZ	xyz(4.8185, 4.0165, 16.7376)
Luminance	0.0402 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3573 #73591B

analogous

#1B6173 #1B3573 #2D1B73

triadic

#1B3573 #731B35 #35731B

tetradic

#1B3573 #731B61 #73591B #1B732D

square

#1B3573 #731B61 #73591B #1B732D

split-complementary

#1B3573 #732D1B #61731B

monochromatic

#060B19 #0F1E41 #1B3573 #274CA5 #3865D0

Accessibility & contrast

On white

11.64

#1B3573 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.80

#1B3573 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3573

11.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3573	#FFFFFF	#000000	##FFFFFF
##1B3573	1.00	11.64	1.80	11.64
#FFFFFF	11.64	1.00	21.00	1.00
#000000	1.80	21.00	1.00	21.00
##FFFFFF	11.64	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0D3D75

Deuteranopia (green-blind)

#003572

Tritanopia (blue-blind)

#00444E

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1b3573;
/* rgb */ color: rgb(27, 53, 115);
/* oklch */ color: oklch(34.7% 0.112 264.2);

Tailwind

colors: {
  custom: {
    50: '#656b9c',
    500: '#1b3573',
    950: '#000000',
  },
}

SCSS

$custom: #1b3573;
$custom-light: #656b9c;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3573",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 115
  },
  "hsl": {
    "h": 222.273,
    "s": 61.972,
    "l": 27.843
  },
  "oklch": {
    "l": 0.34733,
    "c": 0.1117,
    "h": 264.2
  },
  "luminance": 0.04017
}

Semantic roles & 50–950 ramp

primary

#1B3573

secondary

#A88A42

accent

#B543E5

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060E

muted

#7A7A7E

Preview Lab

Preview with #1B3573

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

Preview Lab → · Contrast checker → · Palette generator →