#311F9F#311F9F

#311F9F is a dark, vivid blue. Relative luminance 0.041; OKLCH L 36.6% C 0.191 H 277.7°. Best body text is #FFFFFF at 11.49:1 contrast (WCAG AA passes).

Color values

HEX	#311F9F
RGB	rgb(49, 31, 159)
HSL	hsl(248, 67%, 37%)
HSV	hsv(248, 81%, 62%)
CMYK	cmyk(69.2%, 80.5%, 0%, 37.6%)
CIE-LAB	lab(24.11, 46.33, -65.41)
CIE-LCH	lch(24.11, 80.16, 305.31°)
OKLab	oklab(36.64% 0.0255 -0.189)
OKLCH	oklch(36.64% 0.191 277.7)
XYZ	xyz(8.0126, 4.1354, 33.1701)
Luminance	0.0414 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#311F9F #8D9F1F

analogous

#1F4D9F #311F9F #711F9F

triadic

#311F9F #9F311F #1F9F31

tetradic

#311F9F #9F1F4D #8D9F1F #1F9F71

square

#311F9F #9F1F4D #8D9F1F #1F9F71

split-complementary

#311F9F #9F711F #4D9F1F

monochromatic

#110B39 #21156C #311F9F #4129D2 #6C5ADF

Accessibility & contrast

On white

11.49

#311F9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.83

#311F9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #311F9F

11.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##311F9F	#FFFFFF	#000000	##FFFFFF
##311F9F	1.00	11.49	1.83	11.49
#FFFFFF	11.49	1.00	21.00	1.00
#000000	1.83	21.00	1.00	21.00
##FFFFFF	11.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003EA3

Deuteranopia (green-blind)

#00349D

Tritanopia (blue-blind)

#00465F

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #311f9f;
/* rgb */ color: rgb(49, 31, 159);
/* oklch */ color: oklch(36.6% 0.191 277.7);

Tailwind

colors: {
  custom: {
    50: '#7a5fbd',
    500: '#311f9f',
    950: '#000000',
  },
}

SCSS

$custom: #311f9f;
$custom-light: #7a5fbd;
$custom-dark: #000000;

JSON

{
  "hex": "#311f9f",
  "rgb": {
    "r": 49,
    "g": 31,
    "b": 159
  },
  "hsl": {
    "h": 248.438,
    "s": 67.368,
    "l": 37.255
  },
  "oklch": {
    "l": 0.36642,
    "c": 0.1907,
    "h": 277.7
  },
  "luminance": 0.04136
}

Semantic roles & 50–950 ramp

primary

#311F9F

secondary

#B4C357

accent

#EA3ED2

background

#F8F5FB

surface

#EFE9F7

border

#CAC5D0

text

#0B0512

muted

#7C7981

Preview Lab

Preview with #311F9F

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

Preview Lab → · Contrast checker → · Palette generator →