#3F43BC#3F43BC

#3F43BC is a mid, vivid blue. Relative luminance 0.087; OKLCH L 45.8% C 0.186 H 274.8°. Best body text is #FFFFFF at 7.66:1 contrast (WCAG AA passes).

Color values

HEX	#3F43BC
RGB	rgb(63, 67, 188)
HSL	hsl(238, 50%, 49%)
HSV	hsv(238, 66%, 74%)
CMYK	cmyk(66.5%, 64.4%, 0%, 26.3%)
CIE-LAB	lab(35.40, 36.92, -64.18)
CIE-LCH	lch(35.40, 74.04, 299.91°)
OKLab	oklab(45.82% 0.0156 -0.1851)
OKLCH	oklch(45.82% 0.186 274.8)
XYZ	xyz(13.1312, 8.7007, 48.5546)
Luminance	0.0870 (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

#3F43BC #BCB83F

analogous

#3F82BC #3F43BC #7A3FBC

triadic

#3F43BC #BC3F43 #43BC3F

tetradic

#3F43BC #BC3F82 #BCB83F #3FBC7A

square

#3F43BC #BC3F82 #BCB83F #3FBC7A

split-complementary

#3F43BC #BC7A3F #82BC3F

monochromatic

#202260 #30338E #3F43BC #6B6ECD #999BDD

Accessibility & contrast

On white

7.66

#3F43BC on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.74

#3F43BC on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F43BC

7.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F43BC	#FFFFFF	#000000	##FFFFFF
##3F43BC	1.00	7.66	2.74	7.66
#FFFFFF	7.66	1.00	21.00	1.00
#000000	2.74	21.00	1.00	21.00
##FFFFFF	7.66	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0059C0

Deuteranopia (green-blind)

#004EBA

Tritanopia (blue-blind)

#006279

Achromatopsia (no color)

#535353

Design tokens & code

CSS

--color: #3f43bc;
/* rgb */ color: rgb(63, 67, 188);
/* oklch */ color: oklch(45.8% 0.186 274.8);

Tailwind

colors: {
  custom: {
    50: '#8377d1',
    500: '#3f43bc',
    950: '#000000',
  },
}

SCSS

$custom: #3f43bc;
$custom-light: #8377d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f43bc",
  "rgb": {
    "r": 63,
    "g": 67,
    "b": 188
  },
  "hsl": {
    "h": 238.08,
    "s": 49.801,
    "l": 49.216
  },
  "oklch": {
    "l": 0.4582,
    "c": 0.18579,
    "h": 274.8
  },
  "luminance": 0.08702
}

Semantic roles & 50–950 ramp

primary

#3F43BC

secondary

#C9C78E

accent

#D54ED9

background

#F8F7FD

surface

#F0EDFA

border

#CBC8D3

text

#0C0914

muted

#7D7B83

Preview Lab

Preview with #3F43BC

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

Preview Lab → · Contrast checker → · Palette generator →