#1B3384#1B3384

#1B3384 is a dark, vivid blue. Relative luminance 0.043; OKLCH L 35.8% C 0.139 H 266.5°. Best body text is #FFFFFF at 11.33:1 contrast (WCAG AA passes).

Color values

HEX	#1B3384
RGB	rgb(27, 51, 132)
HSL	hsl(226, 66%, 31%)
HSV	hsv(226, 80%, 52%)
CMYK	cmyk(79.5%, 61.4%, 0%, 48.2%)
CIE-LAB	lab(24.53, 22.13, -48.08)
CIE-LCH	lch(24.53, 52.93, 294.72°)
OKLab	oklab(35.78% -0.0084 -0.1389)
OKLCH	oklch(35.78% 0.139 266.5)
XYZ	xyz(5.7992, 4.2660, 22.3431)
Luminance	0.0427 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3384 #846C1B

analogous

#1B6784 #1B3384 #371B84

triadic

#1B3384 #841B33 #33841B

tetradic

#1B3384 #841B67 #846C1B #1B8437

square

#1B3384 #841B67 #846C1B #1B8437

split-complementary

#1B3384 #84371B #67841B

monochromatic

#060C1E #111F51 #1B3384 #2547B7 #4164D8

Accessibility & contrast

On white

11.33

#1B3384 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#1B3384 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3384

11.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3384	#FFFFFF	#000000	##FFFFFF
##1B3384	1.00	11.33	1.85	11.33
#FFFFFF	11.33	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003F87

Deuteranopia (green-blind)

#003682

Tritanopia (blue-blind)

#004856

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1b3384;
/* rgb */ color: rgb(27, 51, 132);
/* oklch */ color: oklch(35.8% 0.139 266.5);

Tailwind

colors: {
  custom: {
    50: '#696aa9',
    500: '#1b3384',
    950: '#000000',
  },
}

SCSS

$custom: #1b3384;
$custom-light: #696aa9;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3384",
  "rgb": {
    "r": 27,
    "g": 51,
    "b": 132
  },
  "hsl": {
    "h": 226.286,
    "s": 66.038,
    "l": 31.176
  },
  "oklch": {
    "l": 0.35775,
    "c": 0.13919,
    "h": 266.5
  },
  "luminance": 0.04267
}

Semantic roles & 50–950 ramp

primary

#1B3384

secondary

#B79D43

accent

#C23FE9

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#070610

muted

#7A7A7F

Preview Lab

Preview with #1B3384

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

Preview Lab → · Contrast checker → · Palette generator →