#3F31B4#3F31B4

#3F31B4 is a dark, vivid blue. Relative luminance 0.065; OKLCH L 42.2% C 0.196 H 278.7°. Best body text is #FFFFFF at 9.09:1 contrast (WCAG AA passes).

Color values

HEX	#3F31B4
RGB	rgb(63, 49, 180)
HSL	hsl(246, 57%, 45%)
HSV	hsv(246, 73%, 71%)
CMYK	cmyk(65%, 72.8%, 0%, 29.4%)
CIE-LAB	lab(30.75, 44.94, -67.07)
CIE-LCH	lch(30.75, 80.73, 303.82°)
OKLab	oklab(42.25% 0.0297 -0.1936)
OKLCH	oklch(42.25% 0.196 278.7)
XYZ	xyz(11.3838, 6.5477, 43.8351)
Luminance	0.0655 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Sapphire (survey)

#2138AB

ΔE00 4.47

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F31B4 #A6B431

analogous

#3165B4 #3F31B4 #8031B4

triadic

#3F31B4 #B43F31 #31B43F

tetradic

#3F31B4 #B43165 #A6B431 #31B480

square

#3F31B4 #B43165 #A6B431 #31B480

split-complementary

#3F31B4 #B48031 #65B431

monochromatic

#1D1754 #2E2484 #3F31B4 #6052D0 #8C82DD

Accessibility & contrast

On white

9.09

#3F31B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.31

#3F31B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F31B4

9.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F31B4	#FFFFFF	#000000	##FFFFFF
##3F31B4	1.00	9.09	2.31	9.09
#FFFFFF	9.09	1.00	21.00	1.00
#000000	2.31	21.00	1.00	21.00
##FFFFFF	9.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DB8

Deuteranopia (green-blind)

#0043B2

Tritanopia (blue-blind)

#00566F

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #3f31b4;
/* rgb */ color: rgb(63, 49, 180);
/* oklch */ color: oklch(42.2% 0.196 278.7);

Tailwind

colors: {
  custom: {
    50: '#836bcc',
    500: '#3f31b4',
    950: '#000000',
  },
}

SCSS

$custom: #3f31b4;
$custom-light: #836bcc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f31b4",
  "rgb": {
    "r": 63,
    "g": 49,
    "b": 180
  },
  "hsl": {
    "h": 246.412,
    "s": 57.205,
    "l": 44.902
  },
  "oklch": {
    "l": 0.42247,
    "c": 0.19586,
    "h": 278.7
  },
  "luminance": 0.06549
}

Semantic roles & 50–950 ramp

primary

#3F31B4

secondary

#BEC67B

accent

#E047D0

background

#F8F6FC

surface

#F0EBF9

border

#CBC6D2

text

#0C0713

muted

#7D7A82

Preview Lab

Preview with #3F31B4

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

Preview Lab → · Contrast checker → · Palette generator →