#3F42B4#3F42B4

#3F42B4 is a dark, vivid blue. Relative luminance 0.082; OKLCH L 44.9% C 0.176 H 275.5°. Best body text is #FFFFFF at 7.93:1 contrast (WCAG AA passes).

Color values

HEX	#3F42B4
RGB	rgb(63, 66, 180)
HSL	hsl(238, 48%, 48%)
HSV	hsv(238, 65%, 71%)
CMYK	cmyk(65%, 63.3%, 0%, 29.4%)
CIE-LAB	lab(34.49, 34.81, -60.94)
CIE-LCH	lch(34.49, 70.18, 299.73°)
OKLab	oklab(44.95% 0.017 -0.1756)
OKLCH	oklch(44.95% 0.176 275.5)
XYZ	xyz(12.2336, 8.2474, 44.1184)
Luminance	0.0825 (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

#3F42B4 #B4B13F

analogous

#3F7CB4 #3F42B4 #773FB4

triadic

#3F42B4 #B43F42 #42B43F

tetradic

#3F42B4 #B43F7C #B4B13F #3FB477

square

#3F42B4 #B43F7C #B4B13F #3FB477

split-complementary

#3F42B4 #B4773F #7CB43F

monochromatic

#1F2159 #2F3187 #3F42B4 #6769CA #9496DA

Accessibility & contrast

On white

7.93

#3F42B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.65

#3F42B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F42B4

7.93:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F42B4	#FFFFFF	#000000	##FFFFFF
##3F42B4	1.00	7.93	2.65	7.93
#FFFFFF	7.93	1.00	21.00	1.00
#000000	2.65	21.00	1.00	21.00
##FFFFFF	7.93	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0056B8

Deuteranopia (green-blind)

#004CB2

Tritanopia (blue-blind)

#005F75

Achromatopsia (no color)

#515151

Design tokens & code

CSS

--color: #3f42b4;
/* rgb */ color: rgb(63, 66, 180);
/* oklch */ color: oklch(44.9% 0.176 275.5);

Tailwind

colors: {
  custom: {
    50: '#8276cb',
    500: '#3f42b4',
    950: '#000000',
  },
}

SCSS

$custom: #3f42b4;
$custom-light: #8276cb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f42b4",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 180
  },
  "hsl": {
    "h": 238.462,
    "s": 48.148,
    "l": 47.647
  },
  "oklch": {
    "l": 0.44947,
    "c": 0.17647,
    "h": 275.5
  },
  "luminance": 0.08248
}

Semantic roles & 50–950 ramp

primary

#3F42B4

secondary

#C5C38A

accent

#D450D8

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0813

muted

#7D7B82

Preview Lab

Preview with #3F42B4

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

Preview Lab → · Contrast checker → · Palette generator →