#1B3578#1B3578

#1B3578 is a dark, moderate blue. Relative luminance 0.041; OKLCH L 35.1% C 0.119 H 264.9°. Best body text is #FFFFFF at 11.49:1 contrast (WCAG AA passes).

Color values

HEX	#1B3578
RGB	rgb(27, 53, 120)
HSL	hsl(223, 63%, 29%)
HSV	hsv(223, 78%, 47%)
CMYK	cmyk(77.5%, 55.8%, 0%, 52.9%)
CIE-LAB	lab(24.11, 15.87, -41.20)
CIE-LCH	lch(24.11, 44.15, 291.06°)
OKLab	oklab(35.15% -0.0107 -0.1187)
OKLCH	oklch(35.15% 0.119 264.9)
XYZ	xyz(5.1141, 4.1347, 18.2942)
Luminance	0.0413 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3578 #785E1B

analogous

#1B6478 #1B3578 #301B78

triadic

#1B3578 #781B35 #35781B

tetradic

#1B3578 #781B64 #785E1B #1B7830

square

#1B3578 #781B64 #785E1B #1B7830

split-complementary

#1B3578 #78301B #64781B

monochromatic

#060B19 #101F46 #1B3578 #264BAA #3B65D3

Accessibility & contrast

On white

11.49

#1B3578 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.83

#1B3578 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3578

11.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3578	#FFFFFF	#000000	##FFFFFF
##1B3578	1.00	11.49	1.83	11.49
#FFFFFF	11.49	1.00	21.00	1.00
#000000	1.83	21.00	1.00	21.00
##FFFFFF	11.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#023E7A

Deuteranopia (green-blind)

#003577

Tritanopia (blue-blind)

#004551

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1b3578;
/* rgb */ color: rgb(27, 53, 120);
/* oklch */ color: oklch(35.1% 0.119 264.9);

Tailwind

colors: {
  custom: {
    50: '#666b9f',
    500: '#1b3578',
    950: '#000000',
  },
}

SCSS

$custom: #1b3578;
$custom-light: #666b9f;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3578",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 120
  },
  "hsl": {
    "h": 223.226,
    "s": 63.265,
    "l": 28.824
  },
  "oklch": {
    "l": 0.35148,
    "c": 0.11915,
    "h": 264.9
  },
  "luminance": 0.04135
}

Semantic roles & 50–950 ramp

primary

#1B3578

secondary

#AC8F43

accent

#B841E6

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#07060F

muted

#7A7A7E

Preview Lab

Preview with #1B3578

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

Preview Lab → · Contrast checker → · Palette generator →