#1F2571#1F2571

#1F2571 is a dark, vivid blue. Relative luminance 0.028; OKLCH L 31.4% C 0.129 H 272.9°. Best body text is #FFFFFF at 13.45:1 contrast (WCAG AA passes).

Color values

HEX	#1F2571
RGB	rgb(31, 37, 113)
HSL	hsl(236, 57%, 28%)
HSV	hsv(236, 73%, 44%)
CMYK	cmyk(72.6%, 67.3%, 0%, 55.7%)
CIE-LAB	lab(19.25, 24.91, -44.63)
CIE-LCH	lch(19.25, 51.11, 299.17°)
OKLab	oklab(31.4% 0.0065 -0.1289)
OKLCH	oklch(31.4% 0.129 272.9)
XYZ	xyz(4.2063, 2.8063, 15.9396)
Luminance	0.0281 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F2571 #716B1F

analogous

#1F4E71 #1F2571 #421F71

triadic

#1F2571 #711F25 #25711F

tetradic

#1F2571 #711F4E #716B1F #1F7142

square

#1F2571 #711F4E #716B1F #1F7142

split-complementary

#1F2571 #71421F #4E711F

monochromatic

#070818 #121541 #1F2571 #2C35A1 #404ACB

Accessibility & contrast

On white

13.45

#1F2571 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.56

#1F2571 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F2571

13.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F2571	#FFFFFF	#000000	##FFFFFF
##1F2571	1.00	13.45	1.56	13.45
#FFFFFF	13.45	1.00	21.00	1.00
#000000	1.56	21.00	1.00	21.00
##FFFFFF	13.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003373

Deuteranopia (green-blind)

#002B70

Tritanopia (blue-blind)

#003947

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1f2571;
/* rgb */ color: rgb(31, 37, 113);
/* oklch */ color: oklch(31.4% 0.129 272.9);

Tailwind

colors: {
  custom: {
    50: '#675f9b',
    500: '#1f2571',
    950: '#000000',
  },
}

SCSS

$custom: #1f2571;
$custom-light: #675f9b;
$custom-dark: #000000;

JSON

{
  "hex": "#1f2571",
  "rgb": {
    "r": 31,
    "g": 37,
    "b": 113
  },
  "hsl": {
    "h": 235.61,
    "s": 56.944,
    "l": 28.235
  },
  "oklch": {
    "l": 0.31396,
    "c": 0.12902,
    "h": 272.9
  },
  "luminance": 0.02807
}

Semantic roles & 50–950 ramp

primary

#1F2571

secondary

#A59E47

accent

#D548E0

background

#F6F5F9

surface

#EBE9F2

border

#C6C5CC

text

#07040E

muted

#7A797E

Preview Lab

Preview with #1F2571

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

Preview Lab → · Contrast checker → · Palette generator →