#1D3C81#1D3C81

#1D3C81 is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.5% C 0.122 H 263.4°. Best body text is #FFFFFF at 10.42:1 contrast (WCAG AA passes).

Color values

HEX	#1D3C81
RGB	rgb(29, 60, 129)
HSL	hsl(221, 63%, 31%)
HSV	hsv(221, 78%, 51%)
CMYK	cmyk(77.5%, 53.5%, 0%, 49.4%)
CIE-LAB	lab(26.95, 14.86, -42.27)
CIE-LCH	lch(26.95, 44.80, 289.37°)
OKLab	oklab(37.55% -0.014 -0.1216)
OKLCH	oklch(37.55% 0.122 263.4)
XYZ	xyz(6.0836, 5.0772, 21.4240)
Luminance	0.0508 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1D3C81 #81621D

analogous

#1D6E81 #1D3C81 #301D81

triadic

#1D3C81 #811D3C #3C811D

tetradic

#1D3C81 #811D6E #81621D #1D8130

square

#1D3C81 #811D6E #81621D #1D8130

split-complementary

#1D3C81 #81301D #6E811D

monochromatic

#070E1D #12254F #1D3C81 #2853B3 #4471D5

Accessibility & contrast

On white

10.42

#1D3C81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#1D3C81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1D3C81

10.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1D3C81	#FFFFFF	#000000	##FFFFFF
##1D3C81	1.00	10.42	2.02	10.42
#FFFFFF	10.42	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0E4583

Deuteranopia (green-blind)

#003B80

Tritanopia (blue-blind)

#004D58

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1d3c81;
/* rgb */ color: rgb(29, 60, 129);
/* oklch */ color: oklch(37.5% 0.122 263.4);

Tailwind

colors: {
  custom: {
    50: '#6971a6',
    500: '#1d3c81',
    950: '#000000',
  },
}

SCSS

$custom: #1d3c81;
$custom-light: #6971a6;
$custom-dark: #000000;

JSON

{
  "hex": "#1d3c81",
  "rgb": {
    "r": 29,
    "g": 60,
    "b": 129
  },
  "hsl": {
    "h": 221.4,
    "s": 63.291,
    "l": 30.98
  },
  "oklch": {
    "l": 0.37547,
    "c": 0.12244,
    "h": 263.4
  },
  "luminance": 0.05078
}

Semantic roles & 50–950 ramp

primary

#1D3C81

secondary

#B49246

accent

#B341E6

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1D3C81

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

Preview Lab → · Contrast checker → · Palette generator →