#311D9B#311D9B

#311D9B is a dark, vivid blue. Relative luminance 0.039; OKLCH L 36.0% C 0.188 H 278.5°. Best body text is #FFFFFF at 11.80:1 contrast (WCAG AA passes).

Color values

HEX#311D9B
RGBrgb(49, 29, 155)
HSLhsl(250, 68%, 36%)
HSVhsv(250, 81%, 61%)
CMYKcmyk(68.4%, 81.3%, 0%, 39.2%)
CIE-LABlab(23.33, 46.08, -64.26)
CIE-LCHlch(23.33, 79.07, 305.64°)
OKLaboklab(35.97% 0.0276 -0.1856)
OKLCHoklch(35.97% 0.188 278.5)
XYZxyz(7.6205, 3.8976, 31.3547)
Luminance0.0390 (WCAG relative)
Temperaturecool
Familyblue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#311D9B #879B1D
analogous
#1D489B #311D9B #701D9B
triadic
#311D9B #9B311D #1D9B31
tetradic
#311D9B #9B1D48 #879B1D #1D9B70
square
#311D9B #9B1D48 #879B1D #1D9B70
split-complementary
#311D9B #9B701D #489B1D
monochromatic
#100A34 #211367 #311D9B #4127CF #6A53DF

Accessibility & contrast

On white

11.80
#311D9B on #FFFFFF
AA ✓AA large ✓AAA ✓

On black

1.78
#311D9B on #000000
AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #311D9B
11.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##311D9B#FFFFFF#000000##FFFFFF
##311D9B1.0011.801.7811.80
#FFFFFF11.801.0021.001.00
#0000001.7821.001.0021.00
##FFFFFF11.801.0021.001.00

Color blindness preview

Protanopia (red-blind)
#003C9E
Deuteranopia (green-blind)
#003299
Tritanopia (blue-blind)
#00445D
Achromatopsia (no color)
#383838

Design tokens & code

CSS
--color: #311d9b;
/* rgb */ color: rgb(49, 29, 155);
/* oklch */ color: oklch(36.0% 0.188 278.5);
Tailwind
colors: {
  custom: {
    50: '#795dba',
    500: '#311d9b',
    950: '#000000',
  },
}
SCSS
$custom: #311d9b;
$custom-light: #795dba;
$custom-dark: #000000;
JSON
{
  "hex": "#311d9b",
  "rgb": {
    "r": 49,
    "g": 29,
    "b": 155
  },
  "hsl": {
    "h": 249.524,
    "s": 68.478,
    "l": 36.078
  },
  "oklch": {
    "l": 0.35965,
    "c": 0.18766,
    "h": 278.5
  },
  "luminance": 0.03898
}

Semantic roles & 50–950 ramp

primary
#311D9B
secondary
#B0C252
accent
#EB3CD0
background
#F8F5FB
surface
#EFE9F6
border
#CAC5D0
text
#0B0412
muted
#7C7981

Preview Lab

Preview with #311D9B

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

Preview Lab → · Contrast checker → · Palette generator →

#311D9B Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva