#3F31B3#3F31B3

#3F31B3 is a dark, vivid blue. Relative luminance 0.065; OKLCH L 42.1% C 0.195 H 278.8°. Best body text is #FFFFFF at 9.12:1 contrast (WCAG AA passes).

Color values

HEX	#3F31B3
RGB	rgb(63, 49, 179)
HSL	hsl(246, 57%, 45%)
HSV	hsv(246, 73%, 70%)
CMYK	cmyk(64.8%, 72.6%, 0%, 29.8%)
CIE-LAB	lab(30.66, 44.62, -66.63)
CIE-LCH	lch(30.66, 80.19, 303.81°)
OKLab	oklab(42.15% 0.0299 -0.1923)
OKLCH	oklch(42.15% 0.195 278.8)
XYZ	xyz(11.2823, 6.5071, 43.3005)
Luminance	0.0651 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Sapphire (survey)

#2138AB

ΔE00 4.43

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F31B3 #A5B331

analogous

#3164B3 #3F31B3 #8031B3

triadic

#3F31B3 #B33F31 #31B33F

tetradic

#3F31B3 #B33164 #A5B331 #31B380

square

#3F31B3 #B33164 #A5B331 #31B380

split-complementary

#3F31B3 #B38031 #64B331

monochromatic

#1D1753 #2E2483 #3F31B3 #5F52D0 #8C82DD

Accessibility & contrast

On white

9.12

#3F31B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.30

#3F31B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F31B3

9.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F31B3	#FFFFFF	#000000	##FFFFFF
##3F31B3	1.00	9.12	2.30	9.12
#FFFFFF	9.12	1.00	21.00	1.00
#000000	2.30	21.00	1.00	21.00
##FFFFFF	9.12	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DB7

Deuteranopia (green-blind)

#0043B1

Tritanopia (blue-blind)

#00556F

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #3f31b3;
/* rgb */ color: rgb(63, 49, 179);
/* oklch */ color: oklch(42.1% 0.195 278.8);

Tailwind

colors: {
  custom: {
    50: '#836bcb',
    500: '#3f31b3',
    950: '#000000',
  },
}

SCSS

$custom: #3f31b3;
$custom-light: #836bcb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f31b3",
  "rgb": {
    "r": 63,
    "g": 49,
    "b": 179
  },
  "hsl": {
    "h": 246.462,
    "s": 57.018,
    "l": 44.706
  },
  "oklch": {
    "l": 0.42149,
    "c": 0.19463,
    "h": 278.8
  },
  "luminance": 0.06508
}

Semantic roles & 50–950 ramp

primary

#3F31B3

secondary

#BEC67A

accent

#E048D0

background

#F8F6FC

surface

#F0EBF9

border

#CBC6D2

text

#0C0713

muted

#7D7A82

Preview Lab

Preview with #3F31B3

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

Preview Lab → · Contrast checker → · Palette generator →