#3F39BB#3F39BB

#3F39BB is a dark, vivid blue. Relative luminance 0.076; OKLCH L 44.1% C 0.196 H 276.7°. Best body text is #FFFFFF at 8.35:1 contrast (WCAG AA passes).

Color values

HEX	#3F39BB
RGB	rgb(63, 57, 187)
HSL	hsl(243, 53%, 48%)
HSV	hsv(243, 70%, 73%)
CMYK	cmyk(66.3%, 69.5%, 0%, 26.7%)
CIE-LAB	lab(33.07, 42.62, -67.41)
CIE-LCH	lch(33.07, 79.75, 302.31°)
OKLab	oklab(44.1% 0.023 -0.1946)
OKLCH	oklch(44.1% 0.196 276.7)
XYZ	xyz(12.4797, 7.5698, 47.8075)
Luminance	0.0757 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Ocean Blue

#4F42B5

ΔE00 3.11

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F39BB #B5BB39

analogous

#3974BB #3F39BB #8039BB

triadic

#3F39BB #BB3F39 #39BB3F

tetradic

#3F39BB #BB3974 #B5BB39 #39BB80

square

#3F39BB #BB3974 #B5BB39 #39BB80

split-complementary

#3F39BB #BB8039 #74BB39

monochromatic

#1F1C5D #2F2B8C #3F39BB #6762CF #9491DD

Accessibility & contrast

On white

8.35

#3F39BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.51

#3F39BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F39BB

8.35:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F39BB	#FFFFFF	#000000	##FFFFFF
##3F39BB	1.00	8.35	2.51	8.35
#FFFFFF	8.35	1.00	21.00	1.00
#000000	2.51	21.00	1.00	21.00
##FFFFFF	8.35	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053BF

Deuteranopia (green-blind)

#0048B9

Tritanopia (blue-blind)

#005C76

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #3f39bb;
/* rgb */ color: rgb(63, 57, 187);
/* oklch */ color: oklch(44.1% 0.196 276.7);

Tailwind

colors: {
  custom: {
    50: '#8471d1',
    500: '#3f39bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f39bb;
$custom-light: #8471d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f39bb",
  "rgb": {
    "r": 63,
    "g": 57,
    "b": 187
  },
  "hsl": {
    "h": 242.769,
    "s": 53.279,
    "l": 47.843
  },
  "oklch": {
    "l": 0.44104,
    "c": 0.19598,
    "h": 276.7
  },
  "luminance": 0.07571
}

Semantic roles & 50–950 ramp

primary

#3F39BB

secondary

#C5C887

accent

#DD4BD6

background

#F8F6FD

surface

#F0ECFA

border

#CBC7D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #3F39BB

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

Preview Lab → · Contrast checker → · Palette generator →