#1F2371#1F2371

#1F2371 is a dark, vivid blue. Relative luminance 0.027; OKLCH L 31.0% C 0.132 H 273.5°. Best body text is #FFFFFF at 13.66:1 contrast (WCAG AA passes).

Color values

HEX	#1F2371
RGB	rgb(31, 35, 113)
HSL	hsl(237, 57%, 28%)
HSV	hsv(237, 73%, 44%)
CMYK	cmyk(72.6%, 69%, 0%, 55.7%)
CIE-LAB	lab(18.74, 26.28, -45.47)
CIE-LCH	lch(18.74, 52.52, 300.02°)
OKLab	oklab(31.02% 0.008 -0.1313)
OKLCH	oklch(31.02% 0.132 273.5)
XYZ	xyz(4.1457, 2.6852, 15.9194)
Luminance	0.0269 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F2371 #716D1F

analogous

#1F4C71 #1F2371 #441F71

triadic

#1F2371 #711F23 #23711F

tetradic

#1F2371 #711F4C #716D1F #1F7144

square

#1F2371 #711F4C #716D1F #1F7144

split-complementary

#1F2371 #71441F #4C711F

monochromatic

#070718 #121441 #1F2371 #2C32A1 #4047CB

Accessibility & contrast

On white

13.66

#1F2371 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.54

#1F2371 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F2371

13.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F2371	#FFFFFF	#000000	##FFFFFF
##1F2371	1.00	13.66	1.54	13.66
#FFFFFF	13.66	1.00	21.00	1.00
#000000	1.54	21.00	1.00	21.00
##FFFFFF	13.66	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003173

Deuteranopia (green-blind)

#002A70

Tritanopia (blue-blind)

#003846

Achromatopsia (no color)

#2E2E2E

Design tokens & code

CSS

--color: #1f2371;
/* rgb */ color: rgb(31, 35, 113);
/* oklch */ color: oklch(31.0% 0.132 273.5);

Tailwind

colors: {
  custom: {
    50: '#675e9b',
    500: '#1f2371',
    950: '#000000',
  },
}

SCSS

$custom: #1f2371;
$custom-light: #675e9b;
$custom-dark: #000000;

JSON

{
  "hex": "#1f2371",
  "rgb": {
    "r": 31,
    "g": 35,
    "b": 113
  },
  "hsl": {
    "h": 237.073,
    "s": 56.944,
    "l": 28.235
  },
  "oklch": {
    "l": 0.3102,
    "c": 0.13158,
    "h": 273.5
  },
  "luminance": 0.02686
}

Semantic roles & 50–950 ramp

primary

#1F2371

secondary

#A5A047

accent

#D948E0

background

#F6F5F9

surface

#EBE9F2

border

#C6C5CC

text

#07040E

muted

#7A797E

Preview Lab

Preview with #1F2371

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

Preview Lab → · Contrast checker → · Palette generator →