#1B3377#1B3377

#1B3377 is a dark, vivid blue. Relative luminance 0.039; OKLCH L 34.6% C 0.120 H 265.7°. Best body text is #FFFFFF at 11.75:1 contrast (WCAG AA passes).

Color values

HEX	#1B3377
RGB	rgb(27, 51, 119)
HSL	hsl(224, 63%, 29%)
HSV	hsv(224, 77%, 47%)
CMYK	cmyk(77.3%, 57.1%, 0%, 53.3%)
CIE-LAB	lab(23.45, 16.88, -41.65)
CIE-LCH	lch(23.45, 44.94, 292.06°)
OKLab	oklab(34.62% -0.0091 -0.12)
OKLCH	oklch(34.62% 0.12 265.7)
XYZ	xyz(4.9644, 3.9320, 17.9465)
Luminance	0.0393 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3377 #775F1B

analogous

#1B6177 #1B3377 #311B77

triadic

#1B3377 #771B33 #33771B

tetradic

#1B3377 #771B61 #775F1B #1B7731

square

#1B3377 #771B61 #775F1B #1B7731

split-complementary

#1B3377 #77311B #61771B

monochromatic

#060B19 #101E45 #1B3377 #2648A9 #3A62D2

Accessibility & contrast

On white

11.75

#1B3377 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.79

#1B3377 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3377

11.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3377	#FFFFFF	#000000	##FFFFFF
##1B3377	1.00	11.75	1.79	11.75
#FFFFFF	11.75	1.00	21.00	1.00
#000000	1.79	21.00	1.00	21.00
##FFFFFF	11.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C79

Deuteranopia (green-blind)

#003476

Tritanopia (blue-blind)

#00444F

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1b3377;
/* rgb */ color: rgb(27, 51, 119);
/* oklch */ color: oklch(34.6% 0.120 265.7);

Tailwind

colors: {
  custom: {
    50: '#666a9f',
    500: '#1b3377',
    950: '#000000',
  },
}

SCSS

$custom: #1b3377;
$custom-light: #666a9f;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3377",
  "rgb": {
    "r": 27,
    "g": 51,
    "b": 119
  },
  "hsl": {
    "h": 224.348,
    "s": 63.014,
    "l": 28.627
  },
  "oklch": {
    "l": 0.34619,
    "c": 0.12036,
    "h": 265.7
  },
  "luminance": 0.03933
}

Semantic roles & 50–950 ramp

primary

#1B3377

secondary

#AB9042

accent

#BB42E6

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#07060E

muted

#7A7A7E

Preview Lab

Preview with #1B3377

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

Preview Lab → · Contrast checker → · Palette generator →