#3F31B5#3F31B5

#3F31B5 is a dark, vivid blue. Relative luminance 0.066; OKLCH L 42.3% C 0.197 H 278.6°. Best body text is #FFFFFF at 9.06:1 contrast (WCAG AA passes).

Color values

HEX	#3F31B5
RGB	rgb(63, 49, 181)
HSL	hsl(246, 57%, 45%)
HSV	hsv(246, 73%, 71%)
CMYK	cmyk(65.2%, 72.9%, 0%, 29%)
CIE-LAB	lab(30.85, 45.25, -67.50)
CIE-LCH	lch(30.85, 81.27, 303.84°)
OKLab	oklab(42.35% 0.0295 -0.1949)
OKLCH	oklch(42.35% 0.197 278.6)
XYZ	xyz(11.4860, 6.5886, 44.3735)
Luminance	0.0659 (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

#3F31B5 #A7B531

analogous

#3165B5 #3F31B5 #8131B5

triadic

#3F31B5 #B53F31 #31B53F

tetradic

#3F31B5 #B53165 #A7B531 #31B581

square

#3F31B5 #B53165 #A7B531 #31B581

split-complementary

#3F31B5 #B58131 #65B531

monochromatic

#1D1755 #2E2485 #3F31B5 #6053D0 #8D83DD

Accessibility & contrast

On white

9.06

#3F31B5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.32

#3F31B5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F31B5

9.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F31B5	#FFFFFF	#000000	##FFFFFF
##3F31B5	1.00	9.06	2.32	9.06
#FFFFFF	9.06	1.00	21.00	1.00
#000000	2.32	21.00	1.00	21.00
##FFFFFF	9.06	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004EB9

Deuteranopia (green-blind)

#0043B3

Tritanopia (blue-blind)

#005670

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #3f31b5;
/* rgb */ color: rgb(63, 49, 181);
/* oklch */ color: oklch(42.3% 0.197 278.6);

Tailwind

colors: {
  custom: {
    50: '#836bcc',
    500: '#3f31b5',
    950: '#000000',
  },
}

SCSS

$custom: #3f31b5;
$custom-light: #836bcc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f31b5",
  "rgb": {
    "r": 63,
    "g": 49,
    "b": 181
  },
  "hsl": {
    "h": 246.364,
    "s": 57.391,
    "l": 45.098
  },
  "oklch": {
    "l": 0.42346,
    "c": 0.19708,
    "h": 278.6
  },
  "luminance": 0.0659
}

Semantic roles & 50–950 ramp

primary

#3F31B5

secondary

#BFC77B

accent

#E147D0

background

#F8F6FC

surface

#F0EBF9

border

#CBC6D2

text

#0C0714

muted

#7D7A82

Preview Lab

Preview with #3F31B5

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

Preview Lab → · Contrast checker → · Palette generator →