#3131AB#3131AB

#3131AB is a dark, vivid blue. Relative luminance 0.058; OKLCH L 40.4% C 0.188 H 274.0°. Best body text is #FFFFFF at 9.73:1 contrast (WCAG AA passes).

Color values

HEX	#3131AB
RGB	rgb(49, 49, 171)
HSL	hsl(240, 55%, 43%)
HSV	hsv(240, 71%, 67%)
CMYK	cmyk(71.3%, 71.3%, 0%, 32.9%)
CIE-LAB	lab(28.87, 40.34, -64.82)
CIE-LCH	lch(28.87, 76.35, 301.90°)
OKLab	oklab(40.38% 0.0132 -0.1874)
OKLCH	oklch(40.38% 0.188 274)
XYZ	xyz(9.7132, 5.7889, 39.1257)
Luminance	0.0579 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 6.33

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3131AB #ABAB31

analogous

#316EAB #3131AB #6E31AB

triadic

#3131AB #AB3131 #31AB31

tetradic

#3131AB #AB316E #ABAB31 #31AB6E

square

#3131AB #AB316E #ABAB31 #31AB6E

split-complementary

#3131AB #AB6E31 #6EAB31

monochromatic

#16164C #23237B #3131AB #4D4DCC #7D7DDA

Accessibility & contrast

On white

9.73

#3131AB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.16

#3131AB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3131AB

9.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3131AB	#FFFFFF	#000000	##FFFFFF
##3131AB	1.00	9.73	2.16	9.73
#FFFFFF	9.73	1.00	21.00	1.00
#000000	2.16	21.00	1.00	21.00
##FFFFFF	9.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004AAF

Deuteranopia (green-blind)

#003EA9

Tritanopia (blue-blind)

#00536A

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #3131ab;
/* rgb */ color: rgb(49, 49, 171);
/* oklch */ color: oklch(40.4% 0.188 274.0);

Tailwind

colors: {
  custom: {
    50: '#7b6ac5',
    500: '#3131ab',
    950: '#000000',
  },
}

SCSS

$custom: #3131ab;
$custom-light: #7b6ac5;
$custom-dark: #000000;

JSON

{
  "hex": "#3131ab",
  "rgb": {
    "r": 49,
    "g": 49,
    "b": 171
  },
  "hsl": {
    "h": 240,
    "s": 55.455,
    "l": 43.137
  },
  "oklch": {
    "l": 0.40381,
    "c": 0.18788,
    "h": 274
  },
  "luminance": 0.0579
}

Semantic roles & 50–950 ramp

primary

#3131AB

secondary

#C2C275

accent

#DF49DF

background

#F8F6FC

surface

#EFEBF8

border

#CAC6D1

text

#0B0613

muted

#7C7A82

Preview Lab

Preview with #3131AB

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

Preview Lab → · Contrast checker → · Palette generator →