#1B3579#1B3579

#1B3579 is a dark, vivid blue. Relative luminance 0.042; OKLCH L 35.2% C 0.121 H 265.0°. Best body text is #FFFFFF at 11.46:1 contrast (WCAG AA passes).

Color values

HEX	#1B3579
RGB	rgb(27, 53, 121)
HSL	hsl(223, 64%, 29%)
HSV	hsv(223, 78%, 47%)
CMYK	cmyk(77.7%, 56.2%, 0%, 52.5%)
CIE-LAB	lab(24.19, 16.27, -41.71)
CIE-LCH	lch(24.19, 44.77, 291.31°)
OKLab	oklab(35.23% -0.0106 -0.1202)
OKLCH	oklch(35.23% 0.121 265)
XYZ	xyz(5.1751, 4.1591, 18.6155)
Luminance	0.0416 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3579 #795F1B

analogous

#1B6479 #1B3579 #301B79

triadic

#1B3579 #791B35 #35791B

tetradic

#1B3579 #791B64 #795F1B #1B7930

square

#1B3579 #791B64 #795F1B #1B7930

split-complementary

#1B3579 #79301B #64791B

monochromatic

#060B19 #101F47 #1B3579 #264BAB #3B65D3

Accessibility & contrast

On white

11.46

#1B3579 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.83

#1B3579 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3579

11.46:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3579	#FFFFFF	#000000	##FFFFFF
##1B3579	1.00	11.46	1.83	11.46
#FFFFFF	11.46	1.00	21.00	1.00
#000000	1.83	21.00	1.00	21.00
##FFFFFF	11.46	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003E7B

Deuteranopia (green-blind)

#003578

Tritanopia (blue-blind)

#004651

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1b3579;
/* rgb */ color: rgb(27, 53, 121);
/* oklch */ color: oklch(35.2% 0.121 265.0);

Tailwind

colors: {
  custom: {
    50: '#666ba0',
    500: '#1b3579',
    950: '#000000',
  },
}

SCSS

$custom: #1b3579;
$custom-light: #666ba0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3579",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 121
  },
  "hsl": {
    "h": 223.404,
    "s": 63.514,
    "l": 29.02
  },
  "oklch": {
    "l": 0.35233,
    "c": 0.12062,
    "h": 265
  },
  "luminance": 0.0416
}

Semantic roles & 50–950 ramp

primary

#1B3579

secondary

#AD9043

accent

#B941E7

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#07060F

muted

#7A7A7E

Preview Lab

Preview with #1B3579

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

Preview Lab → · Contrast checker → · Palette generator →