#1F3571#1F3571

#1F3571 is a dark, moderate blue. Relative luminance 0.040; OKLCH L 34.8% C 0.107 H 265.9°. Best body text is #FFFFFF at 11.63:1 contrast (WCAG AA passes).

Color values

HEX	#1F3571
RGB	rgb(31, 53, 113)
HSL	hsl(224, 57%, 28%)
HSV	hsv(224, 73%, 44%)
CMYK	cmyk(72.6%, 53.1%, 0%, 55.7%)
CIE-LAB	lab(23.77, 13.63, -37.29)
CIE-LCH	lch(23.77, 39.70, 290.08°)
OKLab	oklab(34.77% -0.0077 -0.1071)
OKLCH	oklch(34.77% 0.107 265.9)
XYZ	xyz(4.8178, 4.0293, 16.1434)
Luminance	0.0403 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3571 #715B1F

analogous

#1F5E71 #1F3571 #321F71

triadic

#1F3571 #711F35 #35711F

tetradic

#1F3571 #711F5E #715B1F #1F7132

square

#1F3571 #711F5E #715B1F #1F7132

split-complementary

#1F3571 #71321F #5E711F

monochromatic

#070B18 #121E41 #1F3571 #2C4CA1 #4065CB

Accessibility & contrast

On white

11.63

#1F3571 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#1F3571 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3571

11.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3571	#FFFFFF	#000000	##FFFFFF
##1F3571	1.00	11.63	1.81	11.63
#FFFFFF	11.63	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#113D73

Deuteranopia (green-blind)

#003570

Tritanopia (blue-blind)

#00434D

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1f3571;
/* rgb */ color: rgb(31, 53, 113);
/* oklch */ color: oklch(34.8% 0.107 265.9);

Tailwind

colors: {
  custom: {
    50: '#666b9a',
    500: '#1f3571',
    950: '#000000',
  },
}

SCSS

$custom: #1f3571;
$custom-light: #666b9a;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3571",
  "rgb": {
    "r": 31,
    "g": 53,
    "b": 113
  },
  "hsl": {
    "h": 223.902,
    "s": 56.944,
    "l": 28.235
  },
  "oklch": {
    "l": 0.3477,
    "c": 0.10735,
    "h": 265.9
  },
  "luminance": 0.0403
}

Semantic roles & 50–950 ramp

primary

#1F3571

secondary

#A58C47

accent

#B748E0

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060E

muted

#7A7A7E

Preview Lab

Preview with #1F3571

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

Preview Lab → · Contrast checker → · Palette generator →