#3F31B2#3F31B2

#3F31B2 is a dark, vivid blue. Relative luminance 0.065; OKLCH L 42.1% C 0.193 H 278.9°. Best body text is #FFFFFF at 9.16:1 contrast (WCAG AA passes).

Color values

HEX	#3F31B2
RGB	rgb(63, 49, 178)
HSL	hsl(247, 57%, 45%)
HSV	hsv(247, 72%, 70%)
CMYK	cmyk(64.6%, 72.5%, 0%, 30.2%)
CIE-LAB	lab(30.56, 44.30, -66.19)
CIE-LCH	lch(30.56, 79.65, 303.79°)
OKLab	oklab(42.05% 0.0301 -0.191)
OKLCH	oklch(42.05% 0.193 278.9)
XYZ	xyz(11.1815, 6.4668, 42.7698)
Luminance	0.0647 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Sapphire (survey)

#2138AB

ΔE00 4.40

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F31B2 #A4B231

analogous

#3163B2 #3F31B2 #8031B2

triadic

#3F31B2 #B23F31 #31B23F

tetradic

#3F31B2 #B23163 #A4B231 #31B280

square

#3F31B2 #B23163 #A4B231 #31B280

split-complementary

#3F31B2 #B28031 #63B231

monochromatic

#1D1752 #2E2482 #3F31B2 #5F51CF #8B81DC

Accessibility & contrast

On white

9.16

#3F31B2 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.29

#3F31B2 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F31B2

9.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F31B2	#FFFFFF	#000000	##FFFFFF
##3F31B2	1.00	9.16	2.29	9.16
#FFFFFF	9.16	1.00	21.00	1.00
#000000	2.29	21.00	1.00	21.00
##FFFFFF	9.16	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DB6

Deuteranopia (green-blind)

#0043B0

Tritanopia (blue-blind)

#00556E

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #3f31b2;
/* rgb */ color: rgb(63, 49, 178);
/* oklch */ color: oklch(42.1% 0.193 278.9);

Tailwind

colors: {
  custom: {
    50: '#836bca',
    500: '#3f31b2',
    950: '#000000',
  },
}

SCSS

$custom: #3f31b2;
$custom-light: #836bca;
$custom-dark: #000000;

JSON

{
  "hex": "#3f31b2",
  "rgb": {
    "r": 63,
    "g": 49,
    "b": 178
  },
  "hsl": {
    "h": 246.512,
    "s": 56.828,
    "l": 44.51
  },
  "oklch": {
    "l": 0.42051,
    "c": 0.1934,
    "h": 278.9
  },
  "luminance": 0.06468
}

Semantic roles & 50–950 ramp

primary

#3F31B2

secondary

#BDC579

accent

#E048D0

background

#F8F6FC

surface

#F0EBF9

border

#CBC6D2

text

#0C0713

muted

#7D7A82

Preview Lab

Preview with #3F31B2

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

Preview Lab → · Contrast checker → · Palette generator →