#311F9C#311F9C

#311F9C is a dark, vivid blue. Relative luminance 0.040; OKLCH L 36.3% C 0.187 H 278.1°. Best body text is #FFFFFF at 11.62:1 contrast (WCAG AA passes).

Color values

HEX	#311F9C
RGB	rgb(49, 31, 156)
HSL	hsl(249, 67%, 37%)
HSV	hsv(249, 80%, 61%)
CMYK	cmyk(68.6%, 80.1%, 0%, 38.8%)
CIE-LAB	lab(23.78, 45.41, -64.13)
CIE-LCH	lch(23.78, 78.58, 305.30°)
OKLab	oklab(36.31% 0.0264 -0.1853)
OKLCH	oklch(36.31% 0.187 278.1)
XYZ	xyz(7.7554, 4.0326, 31.8157)
Luminance	0.0403 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#311F9C #8A9C1F

analogous

#1F4C9C #311F9C #701F9C

triadic

#311F9C #9C311F #1F9C31

tetradic

#311F9C #9C1F4C #8A9C1F #1F9C70

square

#311F9C #9C1F4C #8A9C1F #1F9C70

split-complementary

#311F9C #9C701F #4C9C1F

monochromatic

#110B36 #211569 #311F9C #4129CF #6B58DE

Accessibility & contrast

On white

11.62

#311F9C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#311F9C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #311F9C

11.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##311F9C	#FFFFFF	#000000	##FFFFFF
##311F9C	1.00	11.62	1.81	11.62
#FFFFFF	11.62	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.62	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003D9F

Deuteranopia (green-blind)

#00339A

Tritanopia (blue-blind)

#00455D

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #311f9c;
/* rgb */ color: rgb(49, 31, 156);
/* oklch */ color: oklch(36.3% 0.187 278.1);

Tailwind

colors: {
  custom: {
    50: '#795eba',
    500: '#311f9c',
    950: '#000000',
  },
}

SCSS

$custom: #311f9c;
$custom-light: #795eba;
$custom-dark: #000000;

JSON

{
  "hex": "#311f9c",
  "rgb": {
    "r": 49,
    "g": 31,
    "b": 156
  },
  "hsl": {
    "h": 248.64,
    "s": 66.845,
    "l": 36.667
  },
  "oklch": {
    "l": 0.3631,
    "c": 0.18713,
    "h": 278.1
  },
  "luminance": 0.04033
}

Semantic roles & 50–950 ramp

primary

#311F9C

secondary

#B2C155

accent

#EA3ED1

background

#F8F5FB

surface

#EFE9F6

border

#CAC5D0

text

#0B0512

muted

#7C7981

Preview Lab

Preview with #311F9C

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

Preview Lab → · Contrast checker → · Palette generator →