#3F42BF#3F42BF

#3F42BF is a mid, vivid blue. Relative luminance 0.087; OKLCH L 45.9% C 0.191 H 274.9°. Best body text is #FFFFFF at 7.66:1 contrast (WCAG AA passes).

Color values

HEX	#3F42BF
RGB	rgb(63, 66, 191)
HSL	hsl(239, 50%, 50%)
HSV	hsv(239, 67%, 75%)
CMYK	cmyk(67%, 65.4%, 0%, 25.1%)
CIE-LAB	lab(35.43, 38.56, -65.90)
CIE-LCH	lch(35.43, 76.35, 300.33°)
OKLab	oklab(45.92% 0.0161 -0.1902)
OKLCH	oklch(45.92% 0.191 274.9)
XYZ	xyz(13.3990, 8.7136, 50.2559)
Luminance	0.0872 (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

#3F42BF #BFBC3F

analogous

#3F82BF #3F42BF #7C3FBF

triadic

#3F42BF #BF3F42 #42BF3F

tetradic

#3F42BF #BF3F82 #BFBC3F #3FBF7C

square

#3F42BF #BF3F82 #BFBC3F #3FBF7C

split-complementary

#3F42BF #BF7C3F #82BF3F

monochromatic

#212263 #303291 #3F42BF #6D6FCF #9B9CDE

Accessibility & contrast

On white

7.66

#3F42BF on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.74

#3F42BF on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F42BF

7.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F42BF	#FFFFFF	#000000	##FFFFFF
##3F42BF	1.00	7.66	2.74	7.66
#FFFFFF	7.66	1.00	21.00	1.00
#000000	2.74	21.00	1.00	21.00
##FFFFFF	7.66	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0059C3

Deuteranopia (green-blind)

#004EBD

Tritanopia (blue-blind)

#00637A

Achromatopsia (no color)

#535353

Design tokens & code

CSS

--color: #3f42bf;
/* rgb */ color: rgb(63, 66, 191);
/* oklch */ color: oklch(45.9% 0.191 274.9);

Tailwind

colors: {
  custom: {
    50: '#8477d3',
    500: '#3f42bf',
    950: '#000000',
  },
}

SCSS

$custom: #3f42bf;
$custom-light: #8477d3;
$custom-dark: #000000;

JSON

{
  "hex": "#3f42bf",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 191
  },
  "hsl": {
    "h": 238.594,
    "s": 50.394,
    "l": 49.804
  },
  "oklch": {
    "l": 0.45918,
    "c": 0.19086,
    "h": 274.9
  },
  "luminance": 0.08715
}

Semantic roles & 50–950 ramp

primary

#3F42BF

secondary

#CAC990

accent

#D74EDA

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #3F42BF

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

Preview Lab → · Contrast checker → · Palette generator →