#1D3571#1D3571

#1D3571 is a dark, moderate blue. Relative luminance 0.040; OKLCH L 34.7% C 0.108 H 264.9°. Best body text is #FFFFFF at 11.67:1 contrast (WCAG AA passes).

Color values

HEX	#1D3571
RGB	rgb(29, 53, 113)
HSL	hsl(223, 59%, 28%)
HSV	hsv(223, 74%, 44%)
CMYK	cmyk(74.3%, 53.1%, 0%, 55.7%)
CIE-LAB	lab(23.67, 13.31, -37.45)
CIE-LCH	lch(23.67, 39.75, 289.56°)
OKLab	oklab(34.67% -0.0096 -0.1076)
OKLCH	oklch(34.67% 0.108 264.9)
XYZ	xyz(4.7594, 3.9992, 16.1407)
Luminance	0.0400 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1D3571 #71591D

analogous

#1D5F71 #1D3571 #2F1D71

triadic

#1D3571 #711D35 #35711D

tetradic

#1D3571 #711D5F #71591D #1D712F

square

#1D3571 #711D5F #71591D #1D712F

split-complementary

#1D3571 #712F1D #5F711D

monochromatic

#060B18 #111E40 #1D3571 #294CA2 #3C65CD

Accessibility & contrast

On white

11.67

#1D3571 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.80

#1D3571 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1D3571

11.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1D3571	#FFFFFF	#000000	##FFFFFF
##1D3571	1.00	11.67	1.80	11.67
#FFFFFF	11.67	1.00	21.00	1.00
#000000	1.80	21.00	1.00	21.00
##FFFFFF	11.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#113C73

Deuteranopia (green-blind)

#003570

Tritanopia (blue-blind)

#00434D

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1d3571;
/* rgb */ color: rgb(29, 53, 113);
/* oklch */ color: oklch(34.7% 0.108 264.9);

Tailwind

colors: {
  custom: {
    50: '#656b9a',
    500: '#1d3571',
    950: '#000000',
  },
}

SCSS

$custom: #1d3571;
$custom-light: #656b9a;
$custom-dark: #000000;

JSON

{
  "hex": "#1d3571",
  "rgb": {
    "r": 29,
    "g": 53,
    "b": 113
  },
  "hsl": {
    "h": 222.857,
    "s": 59.155,
    "l": 27.843
  },
  "oklch": {
    "l": 0.34667,
    "c": 0.10803,
    "h": 264.9
  },
  "luminance": 0.04
}

Semantic roles & 50–950 ramp

primary

#1D3571

secondary

#A58A44

accent

#B645E2

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060E

muted

#7A7A7E

Preview Lab

Preview with #1D3571

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

Preview Lab → · Contrast checker → · Palette generator →