#311F99#311F99

#311F99 is a dark, vivid blue. Relative luminance 0.039; OKLCH L 36.0% C 0.184 H 278.5°. Best body text is #FFFFFF at 11.75:1 contrast (WCAG AA passes).

Color values

HEX	#311F99
RGB	rgb(49, 31, 153)
HSL	hsl(249, 66%, 36%)
HSV	hsv(249, 80%, 60%)
CMYK	cmyk(68%, 79.7%, 0%, 40%)
CIE-LAB	lab(23.45, 44.48, -62.84)
CIE-LCH	lch(23.45, 76.99, 305.29°)
OKLab	oklab(35.98% 0.0272 -0.1815)
OKLCH	oklch(35.98% 0.184 278.5)
XYZ	xyz(7.5045, 3.9322, 30.4943)
Luminance	0.0393 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#311F99 #87991F

analogous

#1F4A99 #311F99 #6E1F99

triadic

#311F99 #99311F #1F9931

tetradic

#311F99 #991F4A #87991F #1F996E

square

#311F99 #991F4A #87991F #1F996E

split-complementary

#311F99 #996E1F #4A991F

monochromatic

#100A33 #211566 #311F99 #4129CC #6A56DD

Accessibility & contrast

On white

11.75

#311F99 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.79

#311F99 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #311F99

11.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##311F99	#FFFFFF	#000000	##FFFFFF
##311F99	1.00	11.75	1.79	11.75
#FFFFFF	11.75	1.00	21.00	1.00
#000000	1.79	21.00	1.00	21.00
##FFFFFF	11.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C9C

Deuteranopia (green-blind)

#003397

Tritanopia (blue-blind)

#00445C

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #311f99;
/* rgb */ color: rgb(49, 31, 153);
/* oklch */ color: oklch(36.0% 0.184 278.5);

Tailwind

colors: {
  custom: {
    50: '#795eb8',
    500: '#311f99',
    950: '#000000',
  },
}

SCSS

$custom: #311f99;
$custom-light: #795eb8;
$custom-dark: #000000;

JSON

{
  "hex": "#311f99",
  "rgb": {
    "r": 49,
    "g": 31,
    "b": 153
  },
  "hsl": {
    "h": 248.852,
    "s": 66.304,
    "l": 36.078
  },
  "oklch": {
    "l": 0.3598,
    "c": 0.18354,
    "h": 278.5
  },
  "luminance": 0.03933
}

Semantic roles & 50–950 ramp

primary

#311F99

secondary

#B0C054

accent

#E93FD0

background

#F8F5FB

surface

#EFE9F6

border

#CAC5D0

text

#0A0512

muted

#7C7981

Preview Lab

Preview with #311F99

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

Preview Lab → · Contrast checker → · Palette generator →