#1B3388#1B3388

#1B3388 is a dark, vivid blue. Relative luminance 0.044; OKLCH L 36.1% C 0.145 H 266.7°. Best body text is #FFFFFF at 11.20:1 contrast (WCAG AA passes).

Color values

HEX	#1B3388
RGB	rgb(27, 51, 136)
HSL	hsl(227, 67%, 32%)
HSV	hsv(227, 80%, 53%)
CMYK	cmyk(80.1%, 62.5%, 0%, 46.7%)
CIE-LAB	lab(24.88, 23.73, -50.01)
CIE-LCH	lch(24.88, 55.36, 295.39°)
OKLab	oklab(36.14% -0.0084 -0.1446)
OKLCH	oklch(36.14% 0.145 266.7)
XYZ	xyz(6.0782, 4.3775, 23.8124)
Luminance	0.0438 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3388 #88701B

analogous

#1B6A88 #1B3388 #3A1B88

triadic

#1B3388 #881B33 #33881B

tetradic

#1B3388 #881B6A #88701B #1B883A

square

#1B3388 #881B6A #88701B #1B883A

split-complementary

#1B3388 #883A1B #6A881B

monochromatic

#070D22 #112055 #1B3388 #2546BB #4465DA

Accessibility & contrast

On white

11.20

#1B3388 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.88

#1B3388 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3388

11.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3388	#FFFFFF	#000000	##FFFFFF
##1B3388	1.00	11.20	1.88	11.20
#FFFFFF	11.20	1.00	21.00	1.00
#000000	1.88	21.00	1.00	21.00
##FFFFFF	11.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00408B

Deuteranopia (green-blind)

#003686

Tritanopia (blue-blind)

#004958

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1b3388;
/* rgb */ color: rgb(27, 51, 136);
/* oklch */ color: oklch(36.1% 0.145 266.7);

Tailwind

colors: {
  custom: {
    50: '#6a6aab',
    500: '#1b3388',
    950: '#000000',
  },
}

SCSS

$custom: #1b3388;
$custom-light: #6a6aab;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3388",
  "rgb": {
    "r": 27,
    "g": 51,
    "b": 136
  },
  "hsl": {
    "h": 226.789,
    "s": 66.871,
    "l": 31.961
  },
  "oklch": {
    "l": 0.36145,
    "c": 0.14482,
    "h": 266.7
  },
  "luminance": 0.04378
}

Semantic roles & 50–950 ramp

primary

#1B3388

secondary

#BBA144

accent

#C43EEA

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080610

muted

#7A7A7F

Preview Lab

Preview with #1B3388

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

Preview Lab → · Contrast checker → · Palette generator →