#1B3A8D#1B3A8D

#1B3A8D is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.0% C 0.143 H 264.8°. Best body text is #FFFFFF at 10.31:1 contrast (WCAG AA passes).

Color values

HEX	#1B3A8D
RGB	rgb(27, 58, 141)
HSL	hsl(224, 68%, 33%)
HSV	hsv(224, 81%, 55%)
CMYK	cmyk(80.9%, 58.9%, 0%, 44.7%)
CIE-LAB	lab(27.25, 20.87, -49.26)
CIE-LCH	lch(27.25, 53.50, 292.96°)
OKLab	oklab(38.04% -0.013 -0.1423)
OKLCH	oklch(38.04% 0.143 264.8)
XYZ	xyz(6.7711, 5.1814, 25.8374)
Luminance	0.0518 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3A8D #8D6E1B

analogous

#1B738D #1B3A8D #351B8D

triadic

#1B3A8D #8D1B3A #3A8D1B

tetradic

#1B3A8D #8D1B73 #8D6E1B #1B8D35

square

#1B3A8D #8D1B73 #8D6E1B #1B8D35

split-complementary

#1B3A8D #8D351B #738D1B

monochromatic

#071026 #11255A #1B3A8D #254FC0 #476FDC

Accessibility & contrast

On white

10.31

#1B3A8D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#1B3A8D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3A8D

10.31:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3A8D	#FFFFFF	#000000	##FFFFFF
##1B3A8D	1.00	10.31	2.04	10.31
#FFFFFF	10.31	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.31	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004690

Deuteranopia (green-blind)

#003B8B

Tritanopia (blue-blind)

#004F5D

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1b3a8d;
/* rgb */ color: rgb(27, 58, 141);
/* oklch */ color: oklch(38.0% 0.143 264.8);

Tailwind

colors: {
  custom: {
    50: '#6b6faf',
    500: '#1b3a8d',
    950: '#000000',
  },
}

SCSS

$custom: #1b3a8d;
$custom-light: #6b6faf;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3a8d",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 141
  },
  "hsl": {
    "h": 223.684,
    "s": 67.857,
    "l": 32.941
  },
  "oklch": {
    "l": 0.38044,
    "c": 0.14286,
    "h": 264.8
  },
  "luminance": 0.05182
}

Semantic roles & 50–950 ramp

primary

#1B3A8D

secondary

#BD9D46

accent

#BC3DEB

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #1B3A8D

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

Preview Lab → · Contrast checker → · Palette generator →