#3F39B8#3F39B8

#3F39B8 is a dark, vivid blue. Relative luminance 0.074; OKLCH L 43.8% C 0.192 H 277.0°. Best body text is #FFFFFF at 8.44:1 contrast (WCAG AA passes).

Color values

HEX	#3F39B8
RGB	rgb(63, 57, 184)
HSL	hsl(243, 53%, 47%)
HSV	hsv(243, 69%, 72%)
CMYK	cmyk(65.8%, 69%, 0%, 27.8%)
CIE-LAB	lab(32.79, 41.64, -66.09)
CIE-LCH	lch(32.79, 78.11, 302.21°)
OKLab	oklab(43.82% 0.0235 -0.1908)
OKLCH	oklch(43.82% 0.192 277)
XYZ	xyz(12.1619, 7.4427, 46.1338)
Luminance	0.0744 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Ocean Blue

#4F42B5

ΔE00 3.06

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F39B8 #B2B839

analogous

#3972B8 #3F39B8 #7F39B8

triadic

#3F39B8 #B83F39 #39B83F

tetradic

#3F39B8 #B83972 #B2B839 #39B87F

square

#3F39B8 #B83972 #B2B839 #39B87F

split-complementary

#3F39B8 #B87F39 #72B839

monochromatic

#1F1C5B #2F2B89 #3F39B8 #6660CE #938FDC

Accessibility & contrast

On white

8.44

#3F39B8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.49

#3F39B8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F39B8

8.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F39B8	#FFFFFF	#000000	##FFFFFF
##3F39B8	1.00	8.44	2.49	8.44
#FFFFFF	8.44	1.00	21.00	1.00
#000000	2.49	21.00	1.00	21.00
##FFFFFF	8.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052BC

Deuteranopia (green-blind)

#0048B6

Tritanopia (blue-blind)

#005B74

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #3f39b8;
/* rgb */ color: rgb(63, 57, 184);
/* oklch */ color: oklch(43.8% 0.192 277.0);

Tailwind

colors: {
  custom: {
    50: '#8370ce',
    500: '#3f39b8',
    950: '#000000',
  },
}

SCSS

$custom: #3f39b8;
$custom-light: #8370ce;
$custom-dark: #000000;

JSON

{
  "hex": "#3f39b8",
  "rgb": {
    "r": 63,
    "g": 57,
    "b": 184
  },
  "hsl": {
    "h": 242.835,
    "s": 52.697,
    "l": 47.255
  },
  "oklch": {
    "l": 0.43821,
    "c": 0.1922,
    "h": 277
  },
  "luminance": 0.07444
}

Semantic roles & 50–950 ramp

primary

#3F39B8

secondary

#C4C786

accent

#DC4CD5

background

#F8F6FC

surface

#F0ECF9

border

#CBC7D2

text

#0C0714

muted

#7D7A82

Preview Lab

Preview with #3F39B8

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

Preview Lab → · Contrast checker → · Palette generator →