#311F9A#311F9A

#311F9A is a dark, vivid blue. Relative luminance 0.040; OKLCH L 36.1% C 0.185 H 278.4°. Best body text is #FFFFFF at 11.71:1 contrast (WCAG AA passes).

Color values

HEX	#311F9A
RGB	rgb(49, 31, 154)
HSL	hsl(249, 66%, 36%)
HSV	hsv(249, 80%, 60%)
CMYK	cmyk(68.2%, 79.9%, 0%, 39.6%)
CIE-LAB	lab(23.56, 44.79, -63.27)
CIE-LCH	lch(23.56, 77.52, 305.29°)
OKLab	oklab(36.09% 0.0269 -0.1828)
OKLCH	oklch(36.09% 0.185 278.4)
XYZ	xyz(7.5875, 3.9654, 30.9311)
Luminance	0.0397 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#311F9A #889A1F

analogous

#1F4B9A #311F9A #6F1F9A

triadic

#311F9A #9A311F #1F9A31

tetradic

#311F9A #9A1F4B #889A1F #1F9A6F

square

#311F9A #9A1F4B #889A1F #1F9A6F

split-complementary

#311F9A #9A6F1F #4B9A1F

monochromatic

#110A34 #211567 #311F9A #4129CD #6A56DD

Accessibility & contrast

On white

11.71

#311F9A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.79

#311F9A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #311F9A

11.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##311F9A	#FFFFFF	#000000	##FFFFFF
##311F9A	1.00	11.71	1.79	11.71
#FFFFFF	11.71	1.00	21.00	1.00
#000000	1.79	21.00	1.00	21.00
##FFFFFF	11.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003D9D

Deuteranopia (green-blind)

#003398

Tritanopia (blue-blind)

#00445C

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #311f9a;
/* rgb */ color: rgb(49, 31, 154);
/* oklch */ color: oklch(36.1% 0.185 278.4);

Tailwind

colors: {
  custom: {
    50: '#795eb9',
    500: '#311f9a',
    950: '#000000',
  },
}

SCSS

$custom: #311f9a;
$custom-light: #795eb9;
$custom-dark: #000000;

JSON

{
  "hex": "#311f9a",
  "rgb": {
    "r": 49,
    "g": 31,
    "b": 154
  },
  "hsl": {
    "h": 248.78,
    "s": 66.486,
    "l": 36.275
  },
  "oklch": {
    "l": 0.36089,
    "c": 0.18474,
    "h": 278.4
  },
  "luminance": 0.03966
}

Semantic roles & 50–950 ramp

primary

#311F9A

secondary

#B1C154

accent

#E93ED0

background

#F8F5FB

surface

#EFE9F6

border

#CAC5D0

text

#0A0512

muted

#7C7981

Preview Lab

Preview with #311F9A

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

Preview Lab → · Contrast checker → · Palette generator →