#3F439A#3F439A

#3F439A is a dark, vivid blue. Relative luminance 0.074; OKLCH L 43.0% C 0.139 H 276.8°. Best body text is #FFFFFF at 8.47:1 contrast (WCAG AA passes).

Color values

HEX	#3F439A
RGB	rgb(63, 67, 154)
HSL	hsl(237, 42%, 43%)
HSV	hsv(237, 59%, 60%)
CMYK	cmyk(59.1%, 56.5%, 0%, 39.6%)
CIE-LAB	lab(32.71, 25.21, -48.26)
CIE-LCH	lch(32.71, 54.45, 297.58°)
OKLab	oklab(42.99% 0.0166 -0.1384)
OKLCH	oklch(42.99% 0.139 276.8)
XYZ	xyz(9.8879, 7.4035, 31.4735)
Luminance	0.0740 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F439A #9A963F

analogous

#3F709A #3F439A #693F9A

triadic

#3F439A #9A3F43 #439A3F

tetradic

#3F439A #9A3F70 #9A963F #3F9A69

square

#3F439A #9A3F70 #9A963F #3F9A69

split-complementary

#3F439A #9A693F #709A3F

monochromatic

#1B1D43 #2D306F #3F439A #5A5FBC #8689CD

Accessibility & contrast

On white

8.47

#3F439A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.48

#3F439A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F439A

8.47:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F439A	#FFFFFF	#000000	##FFFFFF
##3F439A	1.00	8.47	2.48	8.47
#FFFFFF	8.47	1.00	21.00	1.00
#000000	2.48	21.00	1.00	21.00
##FFFFFF	8.47	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#01519D

Deuteranopia (green-blind)

#004998

Tritanopia (blue-blind)

#015768

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #3f439a;
/* rgb */ color: rgb(63, 67, 154);
/* oklch */ color: oklch(43.0% 0.139 276.8);

Tailwind

colors: {
  custom: {
    50: '#7d77b8',
    500: '#3f439a',
    950: '#000000',
  },
}

SCSS

$custom: #3f439a;
$custom-light: #7d77b8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f439a",
  "rgb": {
    "r": 63,
    "g": 67,
    "b": 154
  },
  "hsl": {
    "h": 237.363,
    "s": 41.935,
    "l": 42.549
  },
  "oklch": {
    "l": 0.4299,
    "c": 0.13936,
    "h": 276.8
  },
  "luminance": 0.07404
}

Semantic roles & 50–950 ramp

primary

#3F439A

secondary

#B8B57D

accent

#CC56D2

background

#F8F7FB

surface

#EFEDF6

border

#CAC8D0

text

#0A0811

muted

#7C7B80

Preview Lab

Preview with #3F439A

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

Preview Lab → · Contrast checker → · Palette generator →