#311F9B#311F9B

#311F9B is a dark, vivid blue. Relative luminance 0.040; OKLCH L 36.2% C 0.186 H 278.2°. Best body text is #FFFFFF at 11.67:1 contrast (WCAG AA passes).

Color values

HEX	#311F9B
RGB	rgb(49, 31, 155)
HSL	hsl(249, 67%, 36%)
HSV	hsv(249, 80%, 61%)
CMYK	cmyk(68.4%, 80%, 0%, 39.2%)
CIE-LAB	lab(23.67, 45.10, -63.70)
CIE-LCH	lch(23.67, 78.05, 305.30°)
OKLab	oklab(36.2% 0.0266 -0.184)
OKLCH	oklch(36.2% 0.186 278.2)
XYZ	xyz(7.6711, 3.9988, 31.3716)
Luminance	0.0400 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#311F9B #899B1F

analogous

#1F4B9B #311F9B #6F1F9B

triadic

#311F9B #9B311F #1F9B31

tetradic

#311F9B #9B1F4B #899B1F #1F9B6F

square

#311F9B #9B1F4B #899B1F #1F9B6F

split-complementary

#311F9B #9B6F1F #4B9B1F

monochromatic

#110B35 #211568 #311F9B #4129CE #6B57DD

Accessibility & contrast

On white

11.67

#311F9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.80

#311F9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #311F9B

11.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##311F9B	#FFFFFF	#000000	##FFFFFF
##311F9B	1.00	11.67	1.80	11.67
#FFFFFF	11.67	1.00	21.00	1.00
#000000	1.80	21.00	1.00	21.00
##FFFFFF	11.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003D9E

Deuteranopia (green-blind)

#003399

Tritanopia (blue-blind)

#00455D

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #311f9b;
/* rgb */ color: rgb(49, 31, 155);
/* oklch */ color: oklch(36.2% 0.186 278.2);

Tailwind

colors: {
  custom: {
    50: '#795eba',
    500: '#311f9b',
    950: '#000000',
  },
}

SCSS

$custom: #311f9b;
$custom-light: #795eba;
$custom-dark: #000000;

JSON

{
  "hex": "#311f9b",
  "rgb": {
    "r": 49,
    "g": 31,
    "b": 155
  },
  "hsl": {
    "h": 248.71,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.362,
    "c": 0.18594,
    "h": 278.2
  },
  "luminance": 0.03999
}

Semantic roles & 50–950 ramp

primary

#311F9B

secondary

#B1C155

accent

#EA3ED1

background

#F8F5FB

surface

#EFE9F6

border

#CAC5D0

text

#0A0512

muted

#7C7981

Preview Lab

Preview with #311F9B

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

Preview Lab → · Contrast checker → · Palette generator →