#1B3A8A#1B3A8A

#1B3A8A is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.8% C 0.139 H 264.5°. Best body text is #FFFFFF at 10.40:1 contrast (WCAG AA passes).

Color values

HEX	#1B3A8A
RGB	rgb(27, 58, 138)
HSL	hsl(223, 67%, 32%)
HSV	hsv(223, 80%, 54%)
CMYK	cmyk(80.4%, 58%, 0%, 45.9%)
CIE-LAB	lab(27.00, 19.66, -47.80)
CIE-LCH	lch(27.00, 51.69, 292.36°)
OKLab	oklab(37.78% -0.0132 -0.138)
OKLCH	oklch(37.78% 0.139 264.5)
XYZ	xyz(6.5509, 5.0933, 24.6777)
Luminance	0.0509 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3A8A #8A6B1B

analogous

#1B728A #1B3A8A #331B8A

triadic

#1B3A8A #8A1B3A #3A8A1B

tetradic

#1B3A8A #8A1B72 #8A6B1B #1B8A33

square

#1B3A8A #8A1B72 #8A6B1B #1B8A33

split-complementary

#1B3A8A #8A331B #728A1B

monochromatic

#070F24 #112457 #1B3A8A #2550BD #456FDB

Accessibility & contrast

On white

10.40

#1B3A8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#1B3A8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3A8A

10.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3A8A	#FFFFFF	#000000	##FFFFFF
##1B3A8A	1.00	10.40	2.02	10.40
#FFFFFF	10.40	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458D

Deuteranopia (green-blind)

#003B88

Tritanopia (blue-blind)

#004E5C

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1b3a8a;
/* rgb */ color: rgb(27, 58, 138);
/* oklch */ color: oklch(37.8% 0.139 264.5);

Tailwind

colors: {
  custom: {
    50: '#6a6fad',
    500: '#1b3a8a',
    950: '#000000',
  },
}

SCSS

$custom: #1b3a8a;
$custom-light: #6a6fad;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3a8a",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 138
  },
  "hsl": {
    "h": 223.243,
    "s": 67.273,
    "l": 32.353
  },
  "oklch": {
    "l": 0.37781,
    "c": 0.13862,
    "h": 264.5
  },
  "luminance": 0.05094
}

Semantic roles & 50–950 ramp

primary

#1B3A8A

secondary

#BC9B45

accent

#BA3EEA

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1B3A8A

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

Preview Lab → · Contrast checker → · Palette generator →