#311D9E#311D9E

#311D9E is a dark, vivid blue. Relative luminance 0.040; OKLCH L 36.3% C 0.191 H 278.0°. Best body text is #FFFFFF at 11.67:1 contrast (WCAG AA passes).

Color values

HEX	#311D9E
RGB	rgb(49, 29, 158)
HSL	hsl(249, 69%, 37%)
HSV	hsv(249, 82%, 62%)
CMYK	cmyk(69%, 81.6%, 0%, 38%)
CIE-LAB	lab(23.67, 46.99, -65.54)
CIE-LCH	lch(23.67, 80.64, 305.64°)
OKLab	oklab(36.3% 0.0267 -0.1893)
OKLCH	oklch(36.3% 0.191 278)
XYZ	xyz(7.8755, 3.9996, 32.6981)
Luminance	0.0400 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#311D9E #8A9E1D

analogous

#1D4A9E #311D9E #721D9E

triadic

#311D9E #9E311D #1D9E31

tetradic

#311D9E #9E1D4A #8A9E1D #1D9E72

square

#311D9E #9E1D4A #8A9E1D #1D9E72

split-complementary

#311D9E #9E721D #4A9E1D

monochromatic

#110A37 #21146A #311D9E #4126D2 #6B56E0

Accessibility & contrast

On white

11.67

#311D9E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.80

#311D9E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #311D9E

11.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##311D9E	#FFFFFF	#000000	##FFFFFF
##311D9E	1.00	11.67	1.80	11.67
#FFFFFF	11.67	1.00	21.00	1.00
#000000	1.80	21.00	1.00	21.00
##FFFFFF	11.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003DA2

Deuteranopia (green-blind)

#00339C

Tritanopia (blue-blind)

#00455E

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #311d9e;
/* rgb */ color: rgb(49, 29, 158);
/* oklch */ color: oklch(36.3% 0.191 278.0);

Tailwind

colors: {
  custom: {
    50: '#7a5ebc',
    500: '#311d9e',
    950: '#000000',
  },
}

SCSS

$custom: #311d9e;
$custom-light: #7a5ebc;
$custom-dark: #000000;

JSON

{
  "hex": "#311d9e",
  "rgb": {
    "r": 49,
    "g": 29,
    "b": 158
  },
  "hsl": {
    "h": 249.302,
    "s": 68.984,
    "l": 36.667
  },
  "oklch": {
    "l": 0.36301,
    "c": 0.1912,
    "h": 278
  },
  "luminance": 0.04
}

Semantic roles & 50–950 ramp

primary

#311D9E

secondary

#B2C354

accent

#EC3CD1

background

#F8F5FB

surface

#EFE9F7

border

#CAC5D0

text

#0B0412

muted

#7C7981

Preview Lab

Preview with #311D9E

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

Preview Lab → · Contrast checker → · Palette generator →