#3131B4#3131B4

#3131B4 is a dark, vivid blue. Relative luminance 0.061; OKLCH L 41.3% C 0.199 H 273.4°. Best body text is #FFFFFF at 9.42:1 contrast (WCAG AA passes).

Color values

HEX	#3131B4
RGB	rgb(49, 49, 180)
HSL	hsl(240, 57%, 45%)
HSV	hsv(240, 73%, 71%)
CMYK	cmyk(72.8%, 72.8%, 0%, 29.4%)
CIE-LAB	lab(29.77, 43.38, -68.72)
CIE-LCH	lch(29.77, 81.27, 302.26°)
OKLab	oklab(41.29% 0.0118 -0.1988)
OKLCH	oklch(41.29% 0.199 273.4)
XYZ	xyz(10.6004, 6.1438, 43.7984)
Luminance	0.0614 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3131B4 #B4B431

analogous

#3173B4 #3131B4 #7331B4

triadic

#3131B4 #B43131 #31B431

tetradic

#3131B4 #B43173 #B4B431 #31B473

square

#3131B4 #B43173 #B4B431 #31B473

split-complementary

#3131B4 #B47331 #73B431

monochromatic

#171754 #242484 #3131B4 #5252D0 #8282DD

Accessibility & contrast

On white

9.42

#3131B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#3131B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3131B4

9.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3131B4	#FFFFFF	#000000	##FFFFFF
##3131B4	1.00	9.42	2.23	9.42
#FFFFFF	9.42	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004CB8

Deuteranopia (green-blind)

#0040B2

Tritanopia (blue-blind)

#00566F

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #3131b4;
/* rgb */ color: rgb(49, 49, 180);
/* oklch */ color: oklch(41.3% 0.199 273.4);

Tailwind

colors: {
  custom: {
    50: '#7d6acc',
    500: '#3131b4',
    950: '#000000',
  },
}

SCSS

$custom: #3131b4;
$custom-light: #7d6acc;
$custom-dark: #000000;

JSON

{
  "hex": "#3131b4",
  "rgb": {
    "r": 49,
    "g": 49,
    "b": 180
  },
  "hsl": {
    "h": 240,
    "s": 57.205,
    "l": 44.902
  },
  "oklch": {
    "l": 0.41294,
    "c": 0.19914,
    "h": 273.4
  },
  "luminance": 0.06145
}

Semantic roles & 50–950 ramp

primary

#3131B4

secondary

#C6C67B

accent

#E047E0

background

#F8F6FC

surface

#EFEBF9

border

#CAC6D2

text

#0B0713

muted

#7C7A82

Preview Lab

Preview with #3131B4

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

Preview Lab → · Contrast checker → · Palette generator →