#3F42E0#3F42E0

#3F42E0 is a mid, highly saturated blue. Relative luminance 0.103; OKLCH L 49.0% C 0.232 H 273.0°. Best body text is #FFFFFF at 6.85:1 contrast (WCAG AA passes).

Color values

HEX	#3F42E0
RGB	rgb(63, 66, 224)
HSL	hsl(239, 72%, 56%)
HSV	hsv(239, 72%, 88%)
CMYK	cmyk(71.9%, 70.5%, 0%, 12.2%)
CIE-LAB	lab(38.43, 49.54, -80.05)
CIE-LCH	lch(38.43, 94.14, 301.75°)
OKLab	oklab(49% 0.0122 -0.2316)
OKLCH	oklch(49% 0.232 273)
XYZ	xyz(17.4482, 10.3332, 71.5815)
Luminance	0.1033 (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

#3F42E0 #E0DD3F

analogous

#3F93E0 #3F42E0 #8D3FE0

triadic

#3F42E0 #E03F42 #42E03F

tetradic

#3F42E0 #E03F93 #E0DD3F #3FE08D

square

#3F42E0 #E03F93 #E0DD3F #3FE08D

split-complementary

#3F42E0 #E08D3F #93E03F

monochromatic

#17198E #1F22C2 #3F42E0 #7476E9 #A8AAF1

Accessibility & contrast

On white

6.85

#3F42E0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.07

#3F42E0 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F42E0

6.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F42E0	#FFFFFF	#000000	##FFFFFF
##3F42E0	1.00	6.85	3.07	6.85
#FFFFFF	6.85	1.00	21.00	1.00
#000000	3.07	21.00	1.00	21.00
##FFFFFF	6.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0062E5

Deuteranopia (green-blind)

#0053DD

Tritanopia (blue-blind)

#006E8D

Achromatopsia (no color)

#5A5A5A

Design tokens & code

CSS

--color: #3f42e0;
/* rgb */ color: rgb(63, 66, 224);
/* oklch */ color: oklch(49.0% 0.232 273.0);

Tailwind

colors: {
  custom: {
    50: '#8b78eb',
    500: '#3f42e0',
    950: '#000000',
  },
}

SCSS

$custom: #3f42e0;
$custom-light: #8b78eb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f42e0",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 224
  },
  "hsl": {
    "h": 238.882,
    "s": 72.197,
    "l": 56.275
  },
  "oklch": {
    "l": 0.49004,
    "c": 0.23189,
    "h": 273
  },
  "luminance": 0.10335
}

Semantic roles & 50–950 ramp

primary

#3F42E0

secondary

#DFDD9C

accent

#EC39EF

background

#F9F7FE

surface

#F2EDFD

border

#CCC8D5

text

#0E0916

muted

#7E7B84

Preview Lab

Preview with #3F42E0

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

Preview Lab → · Contrast checker → · Palette generator →