#311D99#311D99

#311D99 is a dark, vivid blue. Relative luminance 0.038; OKLCH L 35.7% C 0.185 H 278.8°. Best body text is #FFFFFF at 11.89:1 contrast (WCAG AA passes).

Color values

HEX	#311D99
RGB	rgb(49, 29, 153)
HSL	hsl(250, 68%, 36%)
HSV	hsv(250, 81%, 60%)
CMYK	cmyk(68%, 81%, 0%, 40%)
CIE-LAB	lab(23.10, 45.46, -63.41)
CIE-LCH	lch(23.10, 78.02, 305.64°)
OKLab	oklab(35.74% 0.0282 -0.1831)
OKLCH	oklch(35.74% 0.185 278.8)
XYZ	xyz(7.4539, 3.8310, 30.4775)
Luminance	0.0383 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#311D99 #85991D

analogous

#1D4799 #311D99 #6F1D99

triadic

#311D99 #99311D #1D9931

tetradic

#311D99 #991D47 #85991D #1D996F

square

#311D99 #991D47 #85991D #1D996F

split-complementary

#311D99 #996F1D #47991D

monochromatic

#100932 #211366 #311D99 #4127CC #6952DE

Accessibility & contrast

On white

11.89

#311D99 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.77

#311D99 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #311D99

11.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##311D99	#FFFFFF	#000000	##FFFFFF
##311D99	1.00	11.89	1.77	11.89
#FFFFFF	11.89	1.00	21.00	1.00
#000000	1.77	21.00	1.00	21.00
##FFFFFF	11.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C9C

Deuteranopia (green-blind)

#003297

Tritanopia (blue-blind)

#00435B

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #311d99;
/* rgb */ color: rgb(49, 29, 153);
/* oklch */ color: oklch(35.7% 0.185 278.8);

Tailwind

colors: {
  custom: {
    50: '#795db8',
    500: '#311d99',
    950: '#000000',
  },
}

SCSS

$custom: #311d99;
$custom-light: #795db8;
$custom-dark: #000000;

JSON

{
  "hex": "#311d99",
  "rgb": {
    "r": 49,
    "g": 29,
    "b": 153
  },
  "hsl": {
    "h": 249.677,
    "s": 68.132,
    "l": 35.686
  },
  "oklch": {
    "l": 0.35742,
    "c": 0.18529,
    "h": 278.8
  },
  "luminance": 0.03832
}

Semantic roles & 50–950 ramp

primary

#311D99

secondary

#AFC151

accent

#EB3DCF

background

#F8F5FB

surface

#EFE9F6

border

#CAC5D0

text

#0A0412

muted

#7C7981

Preview Lab

Preview with #311D99

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

Preview Lab → · Contrast checker → · Palette generator →