#3F409C#3F409C

#3F409C is a dark, vivid blue. Relative luminance 0.071; OKLCH L 42.6% C 0.146 H 277.7°. Best body text is #FFFFFF at 8.66:1 contrast (WCAG AA passes).

Color values

HEX	#3F409C
RGB	rgb(63, 64, 156)
HSL	hsl(239, 42%, 43%)
HSV	hsv(239, 60%, 61%)
CMYK	cmyk(59.6%, 59%, 0%, 38.8%)
CIE-LAB	lab(32.09, 27.85, -50.48)
CIE-LCH	lch(32.09, 57.65, 298.88°)
OKLab	oklab(42.57% 0.0197 -0.1449)
OKLCH	oklch(42.57% 0.146 277.7)
XYZ	xyz(9.8821, 7.1231, 32.3002)
Luminance	0.0712 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F409C #9C9B3F

analogous

#3F6E9C #3F409C #6C3F9C

triadic

#3F409C #9C3F40 #409C3F

tetradic

#3F409C #9C3F6E #9C9B3F #3F9C6C

square

#3F409C #9C3F6E #9C9B3F #3F9C6C

split-complementary

#3F409C #9C6C3F #6E9C3F

monochromatic

#1C1C45 #2D2E70 #3F409C #5B5CBD #8788CE

Accessibility & contrast

On white

8.66

#3F409C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.42

#3F409C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F409C

8.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F409C	#FFFFFF	#000000	##FFFFFF
##3F409C	1.00	8.66	2.42	8.66
#FFFFFF	8.66	1.00	21.00	1.00
#000000	2.42	21.00	1.00	21.00
##FFFFFF	8.66	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004F9F

Deuteranopia (green-blind)

#00489A

Tritanopia (blue-blind)

#005667

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #3f409c;
/* rgb */ color: rgb(63, 64, 156);
/* oklch */ color: oklch(42.6% 0.146 277.7);

Tailwind

colors: {
  custom: {
    50: '#7d75ba',
    500: '#3f409c',
    950: '#000000',
  },
}

SCSS

$custom: #3f409c;
$custom-light: #7d75ba;
$custom-dark: #000000;

JSON

{
  "hex": "#3f409c",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 156
  },
  "hsl": {
    "h": 239.355,
    "s": 42.466,
    "l": 42.941
  },
  "oklch": {
    "l": 0.42574,
    "c": 0.14626,
    "h": 277.7
  },
  "luminance": 0.07124
}

Semantic roles & 50–950 ramp

primary

#3F409C

secondary

#B9B87E

accent

#D156D2

background

#F8F7FB

surface

#EFEDF6

border

#CAC8D0

text

#0B0812

muted

#7C7B81

Preview Lab

Preview with #3F409C

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

Preview Lab → · Contrast checker → · Palette generator →