#311FBB#311FBB

#311FBB is a dark, highly saturated blue. Relative luminance 0.052; OKLCH L 39.8% C 0.223 H 274.5°. Best body text is #FFFFFF at 10.27:1 contrast (WCAG AA passes).

Color values

HEX	#311FBB
RGB	rgb(49, 31, 187)
HSL	hsl(247, 72%, 43%)
HSV	hsv(247, 83%, 73%)
CMYK	cmyk(73.8%, 83.4%, 0%, 26.7%)
CIE-LAB	lab(27.35, 54.74, -76.88)
CIE-LCH	lch(27.35, 94.38, 305.45°)
OKLab	oklab(39.82% 0.0175 -0.2223)
OKLCH	oklch(39.82% 0.223 274.5)
XYZ	xyz(10.7233, 5.2197, 47.4464)
Luminance	0.0522 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#311FBB #A9BB1F

analogous

#1F5BBB #311FBB #7F1FBB

triadic

#311FBB #BB311F #1FBB31

tetradic

#311FBB #BB1F5B #A9BB1F #1FBB7F

square

#311FBB #BB1F5B #A9BB1F #1FBB7F

split-complementary

#311FBB #BB7F1F #5BBB1F

monochromatic

#150E52 #231687 #311FBB #4C39DE #7C6EE7

Accessibility & contrast

On white

10.27

#311FBB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#311FBB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #311FBB

10.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##311FBB	#FFFFFF	#000000	##FFFFFF
##311FBB	1.00	10.27	2.04	10.27
#FFFFFF	10.27	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0047BF

Deuteranopia (green-blind)

#0039B8

Tritanopia (blue-blind)

#005270

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #311fbb;
/* rgb */ color: rgb(49, 31, 187);
/* oklch */ color: oklch(39.8% 0.223 274.5);

Tailwind

colors: {
  custom: {
    50: '#8061d1',
    500: '#311fbb',
    950: '#000000',
  },
}

SCSS

$custom: #311fbb;
$custom-light: #8061d1;
$custom-dark: #000000;

JSON

{
  "hex": "#311fbb",
  "rgb": {
    "r": 49,
    "g": 31,
    "b": 187
  },
  "hsl": {
    "h": 246.923,
    "s": 71.56,
    "l": 42.745
  },
  "oklch": {
    "l": 0.39822,
    "c": 0.22297,
    "h": 274.5
  },
  "luminance": 0.05221
}

Semantic roles & 50–950 ramp

primary

#311FBB

secondary

#C1CD69

accent

#EE3AD9

background

#F8F5FD

surface

#F0EAFA

border

#CBC6D3

text

#0C0514

muted

#7D7983

Preview Lab

Preview with #311FBB

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

Preview Lab → · Contrast checker → · Palette generator →