#3F409B#3F409B

#3F409B is a dark, vivid blue. Relative luminance 0.071; OKLCH L 42.5% C 0.145 H 277.8°. Best body text is #FFFFFF at 8.68:1 contrast (WCAG AA passes).

Color values

HEX	#3F409B
RGB	rgb(63, 64, 155)
HSL	hsl(239, 42%, 43%)
HSV	hsv(239, 59%, 61%)
CMYK	cmyk(59.4%, 58.7%, 0%, 39.2%)
CIE-LAB	lab(32.01, 27.50, -50.00)
CIE-LCH	lch(32.01, 57.06, 298.81°)
OKLab	oklab(42.49% 0.0197 -0.1435)
OKLCH	oklch(42.49% 0.145 277.8)
XYZ	xyz(9.7978, 7.0894, 31.8561)
Luminance	0.0709 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F409B #9B9A3F

analogous

#3F6E9B #3F409B #6C3F9B

triadic

#3F409B #9B3F40 #409B3F

tetradic

#3F409B #9B3F6E #9B9A3F #3F9B6C

square

#3F409B #9B3F6E #9B9A3F #3F9B6C

split-complementary

#3F409B #9B6C3F #6E9B3F

monochromatic

#1C1C44 #2D2E6F #3F409B #5B5CBC #8687CE

Accessibility & contrast

On white

8.68

#3F409B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.42

#3F409B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F409B

8.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F409B	#FFFFFF	#000000	##FFFFFF
##3F409B	1.00	8.68	2.42	8.68
#FFFFFF	8.68	1.00	21.00	1.00
#000000	2.42	21.00	1.00	21.00
##FFFFFF	8.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004F9E

Deuteranopia (green-blind)

#004899

Tritanopia (blue-blind)

#005667

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #3f409b;
/* rgb */ color: rgb(63, 64, 155);
/* oklch */ color: oklch(42.5% 0.145 277.8);

Tailwind

colors: {
  custom: {
    50: '#7d75b9',
    500: '#3f409b',
    950: '#000000',
  },
}

SCSS

$custom: #3f409b;
$custom-light: #7d75b9;
$custom-dark: #000000;

JSON

{
  "hex": "#3f409b",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 155
  },
  "hsl": {
    "h": 239.348,
    "s": 42.202,
    "l": 42.745
  },
  "oklch": {
    "l": 0.42494,
    "c": 0.14485,
    "h": 277.8
  },
  "luminance": 0.0709
}

Semantic roles & 50–950 ramp

primary

#3F409B

secondary

#B8B87D

accent

#D156D2

background

#F8F7FB

surface

#EFEDF6

border

#CAC8D0

text

#0A0811

muted

#7C7B80

Preview Lab

Preview with #3F409B

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

Preview Lab → · Contrast checker → · Palette generator →