#1B3B8A#1B3B8A

#1B3B8A is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.0% C 0.137 H 264.2°. Best body text is #FFFFFF at 10.30:1 contrast (WCAG AA passes).

Color values

HEX	#1B3B8A
RGB	rgb(27, 59, 138)
HSL	hsl(223, 67%, 32%)
HSV	hsv(223, 80%, 54%)
CMYK	cmyk(80.4%, 57.2%, 0%, 45.9%)
CIE-LAB	lab(27.28, 18.96, -47.34)
CIE-LCH	lch(27.28, 51.00, 291.83°)
OKLab	oklab(38% -0.0139 -0.1366)
OKLCH	oklch(38% 0.137 264.2)
XYZ	xyz(6.6018, 5.1952, 24.6947)
Luminance	0.0520 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3B8A #8A6A1B

analogous

#1B728A #1B3B8A #331B8A

triadic

#1B3B8A #8A1B3B #3B8A1B

tetradic

#1B3B8A #8A1B72 #8A6A1B #1B8A33

square

#1B3B8A #8A1B72 #8A6A1B #1B8A33

split-complementary

#1B3B8A #8A331B #728A1B

monochromatic

#070F24 #112557 #1B3B8A #2551BD #4570DB

Accessibility & contrast

On white

10.30

#1B3B8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#1B3B8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3B8A

10.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3B8A	#FFFFFF	#000000	##FFFFFF
##1B3B8A	1.00	10.30	2.04	10.30
#FFFFFF	10.30	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00468D

Deuteranopia (green-blind)

#003C88

Tritanopia (blue-blind)

#004F5C

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1b3b8a;
/* rgb */ color: rgb(27, 59, 138);
/* oklch */ color: oklch(38.0% 0.137 264.2);

Tailwind

colors: {
  custom: {
    50: '#6a70ad',
    500: '#1b3b8a',
    950: '#000000',
  },
}

SCSS

$custom: #1b3b8a;
$custom-light: #6a70ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3b8a",
  "rgb": {
    "r": 27,
    "g": 59,
    "b": 138
  },
  "hsl": {
    "h": 222.703,
    "s": 67.273,
    "l": 32.353
  },
  "oklch": {
    "l": 0.37996,
    "c": 0.13732,
    "h": 264.2
  },
  "luminance": 0.05196
}

Semantic roles & 50–950 ramp

primary

#1B3B8A

secondary

#BC9A45

accent

#B83EEA

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1B3B8A

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

Preview Lab → · Contrast checker → · Palette generator →