#1F3583#1F3583

#1F3583 is a dark, vivid blue. Relative luminance 0.045; OKLCH L 36.3% C 0.134 H 267.3°. Best body text is #FFFFFF at 11.08:1 contrast (WCAG AA passes).

Color values

HEX	#1F3583
RGB	rgb(31, 53, 131)
HSL	hsl(227, 62%, 32%)
HSV	hsv(227, 76%, 51%)
CMYK	cmyk(76.3%, 59.5%, 0%, 48.6%)
CIE-LAB	lab(25.19, 20.83, -46.38)
CIE-LCH	lch(25.19, 50.85, 294.18°)
OKLab	oklab(36.29% -0.0063 -0.1338)
OKLCH	oklch(36.29% 0.134 267.3)
XYZ	xyz(5.9335, 4.4756, 22.0195)
Luminance	0.0448 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3583 #836D1F

analogous

#1F6783 #1F3583 #3B1F83

triadic

#1F3583 #831F35 #35831F

tetradic

#1F3583 #831F67 #836D1F #1F833B

square

#1F3583 #831F67 #836D1F #1F833B

split-complementary

#1F3583 #833B1F #67831F

monochromatic

#080D20 #132152 #1F3583 #2B49B4 #4967D4

Accessibility & contrast

On white

11.08

#1F3583 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#1F3583 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3583

11.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3583	#FFFFFF	#000000	##FFFFFF
##1F3583	1.00	11.08	1.90	11.08
#FFFFFF	11.08	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.08	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004186

Deuteranopia (green-blind)

#003781

Tritanopia (blue-blind)

#004856

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1f3583;
/* rgb */ color: rgb(31, 53, 131);
/* oklch */ color: oklch(36.3% 0.134 267.3);

Tailwind

colors: {
  custom: {
    50: '#6a6ba8',
    500: '#1f3583',
    950: '#000000',
  },
}

SCSS

$custom: #1f3583;
$custom-light: #6a6ba8;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3583",
  "rgb": {
    "r": 31,
    "g": 53,
    "b": 131
  },
  "hsl": {
    "h": 226.8,
    "s": 61.728,
    "l": 31.765
  },
  "oklch": {
    "l": 0.36287,
    "c": 0.13398,
    "h": 267.3
  },
  "luminance": 0.04476
}

Semantic roles & 50–950 ramp

primary

#1F3583

secondary

#B69E48

accent

#C143E5

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#070610

muted

#7A7A7F

Preview Lab

Preview with #1F3583

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

Preview Lab → · Contrast checker → · Palette generator →