#311BB4#311BB4

#311BB4 is a dark, highly saturated blue. Relative luminance 0.047; OKLCH L 38.6% C 0.218 H 275.5°. Best body text is #FFFFFF at 10.79:1 contrast (WCAG AA passes).

Color values

HEX	#311BB4
RGB	rgb(49, 27, 180)
HSL	hsl(249, 74%, 41%)
HSV	hsv(249, 85%, 71%)
CMYK	cmyk(72.8%, 85%, 0%, 29.4%)
CIE-LAB	lab(25.95, 54.37, -75.04)
CIE-LCH	lch(25.95, 92.66, 305.92°)
OKLab	oklab(38.62% 0.0208 -0.2169)
OKLCH	oklch(38.62% 0.218 275.5)
XYZ	xyz(9.8941, 4.7312, 43.5629)
Luminance	0.0473 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#311BB4 #9EB41B

analogous

#1B52B4 #311BB4 #7D1BB4

triadic

#311BB4 #B4311B #1BB431

tetradic

#311BB4 #B41B52 #9EB41B #1BB47D

square

#311BB4 #B41B52 #9EB41B #1BB47D

split-complementary

#311BB4 #B47D1B #52B41B

monochromatic

#140B4A #23137F #311BB4 #462DDF #7562E7

Accessibility & contrast

On white

10.79

#311BB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#311BB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #311BB4

10.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##311BB4	#FFFFFF	#000000	##FFFFFF
##311BB4	1.00	10.79	1.95	10.79
#FFFFFF	10.79	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.79	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0044B8

Deuteranopia (green-blind)

#0037B1

Tritanopia (blue-blind)

#004D6B

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #311bb4;
/* rgb */ color: rgb(49, 27, 180);
/* oklch */ color: oklch(38.6% 0.218 275.5);

Tailwind

colors: {
  custom: {
    50: '#7f5ecc',
    500: '#311bb4',
    950: '#000000',
  },
}

SCSS

$custom: #311bb4;
$custom-light: #7f5ecc;
$custom-dark: #000000;

JSON

{
  "hex": "#311bb4",
  "rgb": {
    "r": 49,
    "g": 27,
    "b": 180
  },
  "hsl": {
    "h": 248.627,
    "s": 73.913,
    "l": 40.588
  },
  "oklch": {
    "l": 0.38622,
    "c": 0.21785,
    "h": 275.5
  },
  "luminance": 0.04732
}

Semantic roles & 50–950 ramp

primary

#311BB4

secondary

#BCCC5F

accent

#F137D6

background

#F8F5FC

surface

#F0E9F9

border

#CBC5D2

text

#0C0514

muted

#7D7982

Preview Lab

Preview with #311BB4

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

Preview Lab → · Contrast checker → · Palette generator →