#311DB3#311DB3

#311DB3 is a dark, highly saturated blue. Relative luminance 0.048; OKLCH L 38.7% C 0.215 H 275.5°. Best body text is #FFFFFF at 10.73:1 contrast (WCAG AA passes).

Color values

HEX	#311DB3
RGB	rgb(49, 29, 179)
HSL	hsl(248, 72%, 41%)
HSV	hsv(248, 84%, 70%)
CMYK	cmyk(72.6%, 83.8%, 0%, 29.8%)
CIE-LAB	lab(26.11, 53.25, -74.17)
CIE-LCH	lch(26.11, 91.31, 305.67°)
OKLab	oklab(38.7% 0.0205 -0.2144)
OKLCH	oklch(38.7% 0.215 275.5)
XYZ	xyz(9.8400, 4.7854, 43.0442)
Luminance	0.0479 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#311DB3 #9FB31D

analogous

#1D54B3 #311DB3 #7C1DB3

triadic

#311DB3 #B3311D #1DB331

tetradic

#311DB3 #B31D54 #9FB31D #1DB37C

square

#311DB3 #B31D54 #9FB31D #1DB37C

split-complementary

#311DB3 #B37C1D #54B31D

monochromatic

#140C4A #23147E #311DB3 #4730DD #7664E6

Accessibility & contrast

On white

10.73

#311DB3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#311DB3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #311DB3

10.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##311DB3	#FFFFFF	#000000	##FFFFFF
##311DB3	1.00	10.73	1.96	10.73
#FFFFFF	10.73	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0044B7

Deuteranopia (green-blind)

#0037B1

Tritanopia (blue-blind)

#004E6B

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #311db3;
/* rgb */ color: rgb(49, 29, 179);
/* oklch */ color: oklch(38.7% 0.215 275.5);

Tailwind

colors: {
  custom: {
    50: '#7f5fcb',
    500: '#311db3',
    950: '#000000',
  },
}

SCSS

$custom: #311db3;
$custom-light: #7f5fcb;
$custom-dark: #000000;

JSON

{
  "hex": "#311db3",
  "rgb": {
    "r": 49,
    "g": 29,
    "b": 179
  },
  "hsl": {
    "h": 248,
    "s": 72.115,
    "l": 40.784
  },
  "oklch": {
    "l": 0.38697,
    "c": 0.21537,
    "h": 275.5
  },
  "luminance": 0.04786
}

Semantic roles & 50–950 ramp

primary

#311DB3

secondary

#BDCB61

accent

#EF39D7

background

#F8F5FC

surface

#F0EAF9

border

#CBC6D2

text

#0C0514

muted

#7D7982

Preview Lab

Preview with #311DB3

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

Preview Lab → · Contrast checker → · Palette generator →