#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
RGB	rgb(49, 29, 155)
HSL	hsl(250, 68%, 36%)
HSV	hsv(250, 81%, 61%)
CMYK	cmyk(68.4%, 81.3%, 0%, 39.2%)
CIE-LAB	lab(23.33, 46.08, -64.26)
CIE-LCH	lch(23.33, 79.07, 305.64°)
OKLab	oklab(35.97% 0.0276 -0.1856)
OKLCH	oklch(35.97% 0.188 278.5)
XYZ	xyz(7.6205, 3.8976, 31.3547)
Luminance	0.0390 (WCAG relative)
Temperature	cool
Family	blue

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
##311D9B	1.00	11.80	1.78	11.80
#FFFFFF	11.80	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.80	1.00	21.00	1.00

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 →