#3F42BE#3F42BE

#3F42BE is a mid, vivid blue. Relative luminance 0.087; OKLCH L 45.8% C 0.190 H 274.9°. Best body text is #FFFFFF at 7.68:1 contrast (WCAG AA passes).

Color values

HEX	#3F42BE
RGB	rgb(63, 66, 190)
HSL	hsl(239, 50%, 50%)
HSV	hsv(239, 67%, 75%)
CMYK	cmyk(66.8%, 65.3%, 0%, 25.5%)
CIE-LAB	lab(35.34, 38.22, -65.45)
CIE-LCH	lch(35.34, 75.79, 300.28°)
OKLab	oklab(45.83% 0.0162 -0.1889)
OKLCH	oklch(45.83% 0.19 274.9)
XYZ	xyz(13.2893, 8.6697, 49.6783)
Luminance	0.0867 (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

#3F42BE #BEBB3F

analogous

#3F81BE #3F42BE #7C3FBE

triadic

#3F42BE #BE3F42 #42BE3F

tetradic

#3F42BE #BE3F81 #BEBB3F #3FBE7C

square

#3F42BE #BE3F81 #BEBB3F #3FBE7C

split-complementary

#3F42BE #BE7C3F #81BE3F

monochromatic

#212262 #303290 #3F42BE #6C6ECE #9A9CDD

Accessibility & contrast

On white

7.68

#3F42BE on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.73

#3F42BE on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F42BE

7.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F42BE	#FFFFFF	#000000	##FFFFFF
##3F42BE	1.00	7.68	2.73	7.68
#FFFFFF	7.68	1.00	21.00	1.00
#000000	2.73	21.00	1.00	21.00
##FFFFFF	7.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0059C2

Deuteranopia (green-blind)

#004DBC

Tritanopia (blue-blind)

#00627A

Achromatopsia (no color)

#535353

Design tokens & code

CSS

--color: #3f42be;
/* rgb */ color: rgb(63, 66, 190);
/* oklch */ color: oklch(45.8% 0.190 274.9);

Tailwind

colors: {
  custom: {
    50: '#8477d3',
    500: '#3f42be',
    950: '#000000',
  },
}

SCSS

$custom: #3f42be;
$custom-light: #8477d3;
$custom-dark: #000000;

JSON

{
  "hex": "#3f42be",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 190
  },
  "hsl": {
    "h": 238.583,
    "s": 50.198,
    "l": 49.608
  },
  "oklch": {
    "l": 0.45828,
    "c": 0.18958,
    "h": 274.9
  },
  "luminance": 0.08671
}

Semantic roles & 50–950 ramp

primary

#3F42BE

secondary

#C9C88F

accent

#D64EDA

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #3F42BE

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

Preview Lab → · Contrast checker → · Palette generator →