#3F439B#3F439B

#3F439B is a dark, vivid blue. Relative luminance 0.074; OKLCH L 43.1% C 0.141 H 276.8°. Best body text is #FFFFFF at 8.44:1 contrast (WCAG AA passes).

Color values

HEX	#3F439B
RGB	rgb(63, 67, 155)
HSL	hsl(237, 42%, 43%)
HSV	hsv(237, 59%, 61%)
CMYK	cmyk(59.4%, 56.8%, 0%, 39.2%)
CIE-LAB	lab(32.78, 25.55, -48.75)
CIE-LCH	lch(32.78, 55.04, 297.66°)
OKLab	oklab(43.07% 0.0166 -0.1398)
OKLCH	oklch(43.07% 0.141 276.8)
XYZ	xyz(9.9715, 7.4369, 31.9140)
Luminance	0.0744 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F439B #9B973F

analogous

#3F719B #3F439B #693F9B

triadic

#3F439B #9B3F43 #439B3F

tetradic

#3F439B #9B3F71 #9B973F #3F9B69

square

#3F439B #9B3F71 #9B973F #3F9B69

split-complementary

#3F439B #9B693F #719B3F

monochromatic

#1C1D44 #2D306F #3F439B #5B5FBC #868ACE

Accessibility & contrast

On white

8.44

#3F439B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.49

#3F439B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F439B

8.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F439B	#FFFFFF	#000000	##FFFFFF
##3F439B	1.00	8.44	2.49	8.44
#FFFFFF	8.44	1.00	21.00	1.00
#000000	2.49	21.00	1.00	21.00
##FFFFFF	8.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00519E

Deuteranopia (green-blind)

#004999

Tritanopia (blue-blind)

#005868

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #3f439b;
/* rgb */ color: rgb(63, 67, 155);
/* oklch */ color: oklch(43.1% 0.141 276.8);

Tailwind

colors: {
  custom: {
    50: '#7d77b9',
    500: '#3f439b',
    950: '#000000',
  },
}

SCSS

$custom: #3f439b;
$custom-light: #7d77b9;
$custom-dark: #000000;

JSON

{
  "hex": "#3f439b",
  "rgb": {
    "r": 63,
    "g": 67,
    "b": 155
  },
  "hsl": {
    "h": 237.391,
    "s": 42.202,
    "l": 42.745
  },
  "oklch": {
    "l": 0.43067,
    "c": 0.14078,
    "h": 276.8
  },
  "luminance": 0.07438
}

Semantic roles & 50–950 ramp

primary

#3F439B

secondary

#B8B67D

accent

#CD56D2

background

#F8F7FB

surface

#EFEDF6

border

#CAC8D0

text

#0A0811

muted

#7C7B80

Preview Lab

Preview with #3F439B

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

Preview Lab → · Contrast checker → · Palette generator →