#3F31AB#3F31AB

#3F31AB is a dark, vivid blue. Relative luminance 0.062; OKLCH L 41.4% C 0.185 H 279.8°. Best body text is #FFFFFF at 9.38:1 contrast (WCAG AA passes).

Color values

HEX	#3F31AB
RGB	rgb(63, 49, 171)
HSL	hsl(247, 55%, 43%)
HSV	hsv(247, 71%, 67%)
CMYK	cmyk(63.2%, 71.3%, 0%, 32.9%)
CIE-LAB	lab(29.89, 42.07, -63.11)
CIE-LCH	lch(29.89, 75.84, 303.69°)
OKLab	oklab(41.37% 0.0314 -0.182)
OKLCH	oklch(41.37% 0.185 279.8)
XYZ	xyz(10.4966, 6.1929, 39.1624)
Luminance	0.0619 (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

#3F31AB #9DAB31

analogous

#3160AB #3F31AB #7C31AB

triadic

#3F31AB #AB3F31 #31AB3F

tetradic

#3F31AB #AB3160 #9DAB31 #31AB7C

square

#3F31AB #AB3160 #9DAB31 #31AB7C

split-complementary

#3F31AB #AB7C31 #60AB31

monochromatic

#1C164C #2D237B #3F31AB #5C4DCC #877DDA

Accessibility & contrast

On white

9.38

#3F31AB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.24

#3F31AB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F31AB

9.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F31AB	#FFFFFF	#000000	##FFFFFF
##3F31AB	1.00	9.38	2.24	9.38
#FFFFFF	9.38	1.00	21.00	1.00
#000000	2.24	21.00	1.00	21.00
##FFFFFF	9.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004BAF

Deuteranopia (green-blind)

#0042A9

Tritanopia (blue-blind)

#00526A

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #3f31ab;
/* rgb */ color: rgb(63, 49, 171);
/* oklch */ color: oklch(41.4% 0.185 279.8);

Tailwind

colors: {
  custom: {
    50: '#816bc5',
    500: '#3f31ab',
    950: '#000000',
  },
}

SCSS

$custom: #3f31ab;
$custom-light: #816bc5;
$custom-dark: #000000;

JSON

{
  "hex": "#3f31ab",
  "rgb": {
    "r": 63,
    "g": 49,
    "b": 171
  },
  "hsl": {
    "h": 246.885,
    "s": 55.455,
    "l": 43.137
  },
  "oklch": {
    "l": 0.41374,
    "c": 0.18471,
    "h": 279.8
  },
  "luminance": 0.06194
}

Semantic roles & 50–950 ramp

primary

#3F31AB

secondary

#BAC275

accent

#DF49CE

background

#F8F6FC

surface

#F0EBF8

border

#CBC6D1

text

#0C0713

muted

#7D7A82

Preview Lab

Preview with #3F31AB

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

Preview Lab → · Contrast checker → · Palette generator →