#1B3C85#1B3C85

#1B3C85 is a dark, vivid blue. Relative luminance 0.052; OKLCH L 37.8% C 0.129 H 263.3°. Best body text is #FFFFFF at 10.34:1 contrast (WCAG AA passes).

Color values

HEX	#1B3C85
RGB	rgb(27, 60, 133)
HSL	hsl(221, 66%, 31%)
HSV	hsv(221, 80%, 52%)
CMYK	cmyk(79.7%, 54.9%, 0%, 47.8%)
CIE-LAB	lab(27.18, 16.23, -44.40)
CIE-LCH	lch(27.18, 47.28, 290.08°)
OKLab	oklab(37.79% -0.0151 -0.128)
OKLCH	oklch(37.79% 0.129 263.3)
XYZ	xyz(6.3000, 5.1575, 22.8492)
Luminance	0.0516 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3C85 #85641B

analogous

#1B7185 #1B3C85 #2F1B85

triadic

#1B3C85 #851B3C #3C851B

tetradic

#1B3C85 #851B71 #85641B #1B852F

square

#1B3C85 #851B71 #85641B #1B852F

split-complementary

#1B3C85 #852F1B #71851B

monochromatic

#060E1F #112552 #1B3C85 #2553B8 #4271D9

Accessibility & contrast

On white

10.34

#1B3C85 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#1B3C85 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3C85

10.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3C85	#FFFFFF	#000000	##FFFFFF
##1B3C85	1.00	10.34	2.03	10.34
#FFFFFF	10.34	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.34	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#044588

Deuteranopia (green-blind)

#003C84

Tritanopia (blue-blind)

#004E5A

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1b3c85;
/* rgb */ color: rgb(27, 60, 133);
/* oklch */ color: oklch(37.8% 0.129 263.3);

Tailwind

colors: {
  custom: {
    50: '#6971a9',
    500: '#1b3c85',
    950: '#000000',
  },
}

SCSS

$custom: #1b3c85;
$custom-light: #6971a9;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3c85",
  "rgb": {
    "r": 27,
    "g": 60,
    "b": 133
  },
  "hsl": {
    "h": 221.321,
    "s": 66.25,
    "l": 31.373
  },
  "oklch": {
    "l": 0.37792,
    "c": 0.12885,
    "h": 263.3
  },
  "luminance": 0.05158
}

Semantic roles & 50–950 ramp

primary

#1B3C85

secondary

#B89444

accent

#B43FE9

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #1B3C85

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

Preview Lab → · Contrast checker → · Palette generator →