#3F42CB#3F42CB

#3F42CB is a mid, highly saturated blue. Relative luminance 0.093; OKLCH L 47.0% C 0.206 H 274.1°. Best body text is #FFFFFF at 7.36:1 contrast (WCAG AA passes).

Color values

HEX	#3F42CB
RGB	rgb(63, 66, 203)
HSL	hsl(239, 57%, 52%)
HSV	hsv(239, 69%, 80%)
CMYK	cmyk(69%, 67.5%, 0%, 20.4%)
CIE-LAB	lab(36.49, 42.60, -71.16)
CIE-LCH	lch(36.49, 82.94, 300.91°)
OKLab	oklab(47.01% 0.0149 -0.2056)
OKLCH	oklch(47.01% 0.206 274.1)
XYZ	xyz(14.7740, 9.2636, 57.4978)
Luminance	0.0926 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue Blue

#2242C7

ΔE00 2.85

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F42CB #CBC83F

analogous

#3F88CB #3F42CB #823FCB

triadic

#3F42CB #CB3F42 #42CB3F

tetradic

#3F42CB #CB3F88 #CBC83F #3FCB82

square

#3F42CB #CB3F88 #CBC83F #3FCB82

split-complementary

#3F42CB #CB823F #88CB3F

monochromatic

#1F2071 #2C2EA1 #3F42CB #6F71D8 #9FA1E5

Accessibility & contrast

On white

7.36

#3F42CB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.85

#3F42CB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F42CB

7.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F42CB	#FFFFFF	#000000	##FFFFFF
##3F42CB	1.00	7.36	2.85	7.36
#FFFFFF	7.36	1.00	21.00	1.00
#000000	2.85	21.00	1.00	21.00
##FFFFFF	7.36	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005CCF

Deuteranopia (green-blind)

#004FC8

Tritanopia (blue-blind)

#006781

Achromatopsia (no color)

#565656

Design tokens & code

CSS

--color: #3f42cb;
/* rgb */ color: rgb(63, 66, 203);
/* oklch */ color: oklch(47.0% 0.206 274.1);

Tailwind

colors: {
  custom: {
    50: '#8677dc',
    500: '#3f42cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f42cb;
$custom-light: #8677dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f42cb",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 203
  },
  "hsl": {
    "h": 238.714,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.47012,
    "c": 0.20614,
    "h": 274.1
  },
  "luminance": 0.09265
}

Semantic roles & 50–950 ramp

primary

#3F42CB

secondary

#D1D094

accent

#DD47E1

background

#F9F7FD

surface

#F1EDFB

border

#CBC8D4

text

#0D0915

muted

#7E7B83

Preview Lab

Preview with #3F42CB

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

Preview Lab → · Contrast checker → · Palette generator →