#1D3771#1D3771

#1D3771 is a dark, moderate blue. Relative luminance 0.042; OKLCH L 35.1% C 0.105 H 263.7°. Best body text is #FFFFFF at 11.43:1 contrast (WCAG AA passes).

Color values

HEX	#1D3771
RGB	rgb(29, 55, 113)
HSL	hsl(221, 59%, 28%)
HSV	hsv(221, 74%, 44%)
CMYK	cmyk(74.3%, 51.3%, 0%, 55.7%)
CIE-LAB	lab(24.27, 11.89, -36.48)
CIE-LCH	lch(24.27, 38.37, 288.05°)
OKLab	oklab(35.13% -0.0115 -0.1047)
OKLCH	oklch(35.13% 0.105 263.7)
XYZ	xyz(4.8525, 4.1853, 16.1717)
Luminance	0.0419 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1D3771 #71571D

analogous

#1D6171 #1D3771 #2D1D71

triadic

#1D3771 #711D37 #37711D

tetradic

#1D3771 #711D61 #71571D #1D712D

square

#1D3771 #711D61 #71571D #1D712D

split-complementary

#1D3771 #712D1D #61711D

monochromatic

#060C18 #111F40 #1D3771 #294FA2 #3C69CD

Accessibility & contrast

On white

11.43

#1D3771 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.84

#1D3771 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1D3771

11.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1D3771	#FFFFFF	#000000	##FFFFFF
##1D3771	1.00	11.43	1.84	11.43
#FFFFFF	11.43	1.00	21.00	1.00
#000000	1.84	21.00	1.00	21.00
##FFFFFF	11.43	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#163E73

Deuteranopia (green-blind)

#003670

Tritanopia (blue-blind)

#00454E

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1d3771;
/* rgb */ color: rgb(29, 55, 113);
/* oklch */ color: oklch(35.1% 0.105 263.7);

Tailwind

colors: {
  custom: {
    50: '#656d9a',
    500: '#1d3771',
    950: '#000000',
  },
}

SCSS

$custom: #1d3771;
$custom-light: #656d9a;
$custom-dark: #000000;

JSON

{
  "hex": "#1d3771",
  "rgb": {
    "r": 29,
    "g": 55,
    "b": 113
  },
  "hsl": {
    "h": 221.429,
    "s": 59.155,
    "l": 27.843
  },
  "oklch": {
    "l": 0.35129,
    "c": 0.10533,
    "h": 263.7
  },
  "luminance": 0.04186
}

Semantic roles & 50–950 ramp

primary

#1D3771

secondary

#A58744

accent

#B245E2

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #1D3771

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

Preview Lab → · Contrast checker → · Palette generator →