#3F42C8#3F42C8

#3F42C8 is a mid, highly saturated blue. Relative luminance 0.091; OKLCH L 46.7% C 0.202 H 274.3°. Best body text is #FFFFFF at 7.43:1 contrast (WCAG AA passes).

Color values

HEX	#3F42C8
RGB	rgb(63, 66, 200)
HSL	hsl(239, 55%, 52%)
HSV	hsv(239, 69%, 78%)
CMYK	cmyk(68.5%, 67%, 0%, 21.6%)
CIE-LAB	lab(36.22, 41.59, -69.86)
CIE-LCH	lch(36.22, 81.30, 300.77°)
OKLab	oklab(46.74% 0.0152 -0.2018)
OKLCH	oklch(46.74% 0.202 274.3)
XYZ	xyz(14.4200, 9.1220, 55.6332)
Luminance	0.0912 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue Blue

#2242C7

ΔE00 2.72

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F42C8 #C8C53F

analogous

#3F87C8 #3F42C8 #813FC8

triadic

#3F42C8 #C83F42 #42C83F

tetradic

#3F42C8 #C83F87 #C8C53F #3FC881

square

#3F42C8 #C83F87 #C8C53F #3FC881

split-complementary

#3F42C8 #C8813F #87C83F

monochromatic

#1F216D #2D2F9D #3F42C8 #6F71D6 #9EA0E3

Accessibility & contrast

On white

7.43

#3F42C8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.82

#3F42C8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F42C8

7.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F42C8	#FFFFFF	#000000	##FFFFFF
##3F42C8	1.00	7.43	2.82	7.43
#FFFFFF	7.43	1.00	21.00	1.00
#000000	2.82	21.00	1.00	21.00
##FFFFFF	7.43	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005CCC

Deuteranopia (green-blind)

#004FC5

Tritanopia (blue-blind)

#00667F

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #3f42c8;
/* rgb */ color: rgb(63, 66, 200);
/* oklch */ color: oklch(46.7% 0.202 274.3);

Tailwind

colors: {
  custom: {
    50: '#8677da',
    500: '#3f42c8',
    950: '#000000',
  },
}

SCSS

$custom: #3f42c8;
$custom-light: #8677da;
$custom-dark: #000000;

JSON

{
  "hex": "#3f42c8",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 200
  },
  "hsl": {
    "h": 238.686,
    "s": 55.466,
    "l": 51.569
  },
  "oklch": {
    "l": 0.46735,
    "c": 0.20236,
    "h": 274.3
  },
  "luminance": 0.09123
}

Semantic roles & 50–950 ramp

primary

#3F42C8

secondary

#D0CE93

accent

#DC49DF

background

#F8F7FD

surface

#F0EDFB

border

#CBC8D4

text

#0D0915

muted

#7D7B83

Preview Lab

Preview with #3F42C8

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

Preview Lab → · Contrast checker → · Palette generator →