#3F429A#3F429A

#3F429A is a dark, vivid blue. Relative luminance 0.073; OKLCH L 42.8% C 0.141 H 277.2°. Best body text is #FFFFFF at 8.55:1 contrast (WCAG AA passes).

Color values

HEX	#3F429A
RGB	rgb(63, 66, 154)
HSL	hsl(238, 42%, 43%)
HSV	hsv(238, 59%, 60%)
CMYK	cmyk(59.1%, 57.1%, 0%, 39.6%)
CIE-LAB	lab(32.45, 25.86, -48.68)
CIE-LCH	lch(32.45, 55.12, 297.98°)
OKLab	oklab(42.8% 0.0176 -0.1396)
OKLCH	oklch(42.8% 0.141 277.2)
XYZ	xyz(9.8290, 7.2856, 31.4539)
Luminance	0.0729 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F429A #9A973F

analogous

#3F6F9A #3F429A #6A3F9A

triadic

#3F429A #9A3F42 #429A3F

tetradic

#3F429A #9A3F6F #9A973F #3F9A6A

square

#3F429A #9A3F6F #9A973F #3F9A6A

split-complementary

#3F429A #9A6A3F #6F9A3F

monochromatic

#1B1D43 #2D2F6F #3F429A #5A5EBC #8688CD

Accessibility & contrast

On white

8.55

#3F429A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.46

#3F429A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F429A

8.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F429A	#FFFFFF	#000000	##FFFFFF
##3F429A	1.00	8.55	2.46	8.55
#FFFFFF	8.55	1.00	21.00	1.00
#000000	2.46	21.00	1.00	21.00
##FFFFFF	8.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00509D

Deuteranopia (green-blind)

#004998

Tritanopia (blue-blind)

#025767

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #3f429a;
/* rgb */ color: rgb(63, 66, 154);
/* oklch */ color: oklch(42.8% 0.141 277.2);

Tailwind

colors: {
  custom: {
    50: '#7d76b8',
    500: '#3f429a',
    950: '#000000',
  },
}

SCSS

$custom: #3f429a;
$custom-light: #7d76b8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f429a",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 154
  },
  "hsl": {
    "h": 238.022,
    "s": 41.935,
    "l": 42.549
  },
  "oklch": {
    "l": 0.42796,
    "c": 0.14072,
    "h": 277.2
  },
  "luminance": 0.07286
}

Semantic roles & 50–950 ramp

primary

#3F429A

secondary

#B8B67D

accent

#CE56D2

background

#F8F7FB

surface

#EFEDF6

border

#CAC8D0

text

#0A0811

muted

#7C7B80

Preview Lab

Preview with #3F429A

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

Preview Lab → · Contrast checker → · Palette generator →