#3F428D#3F428D

#3F428D is a dark, vivid blue. Relative luminance 0.069; OKLCH L 41.8% C 0.122 H 278.0°. Best body text is #FFFFFF at 8.84:1 contrast (WCAG AA passes).

Color values

HEX	#3F428D
RGB	rgb(63, 66, 141)
HSL	hsl(238, 38%, 40%)
HSV	hsv(238, 55%, 55%)
CMYK	cmyk(55.3%, 53.2%, 0%, 44.7%)
CIE-LAB	lab(31.52, 21.40, -42.24)
CIE-LCH	lch(31.52, 47.35, 296.87°)
OKLab	oklab(41.81% 0.017 -0.1207)
OKLCH	oklch(41.81% 0.122 278)
XYZ	xyz(8.8043, 6.8757, 26.0573)
Luminance	0.0688 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F428D #8D8A3F

analogous

#3F698D #3F428D #633F8D

triadic

#3F428D #8D3F42 #428D3F

tetradic

#3F428D #8D3F69 #8D8A3F #3F8D63

square

#3F428D #8D3F69 #8D8A3F #3F8D63

split-complementary

#3F428D #8D633F #698D3F

monochromatic

#191A38 #2C2E63 #3F428D #5659B3 #8083C6

Accessibility & contrast

On white

8.84

#3F428D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.38

#3F428D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F428D

8.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F428D	#FFFFFF	#000000	##FFFFFF
##3F428D	1.00	8.84	2.38	8.84
#FFFFFF	8.84	1.00	21.00	1.00
#000000	2.38	21.00	1.00	21.00
##FFFFFF	8.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1A4D90

Deuteranopia (green-blind)

#0E478B

Tritanopia (blue-blind)

#1A5361

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #3f428d;
/* rgb */ color: rgb(63, 66, 141);
/* oklch */ color: oklch(41.8% 0.122 278.0);

Tailwind

colors: {
  custom: {
    50: '#7b76af',
    500: '#3f428d',
    950: '#000000',
  },
}

SCSS

$custom: #3f428d;
$custom-light: #7b76af;
$custom-dark: #000000;

JSON

{
  "hex": "#3f428d",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 141
  },
  "hsl": {
    "h": 237.692,
    "s": 38.235,
    "l": 40
  },
  "oklch": {
    "l": 0.41808,
    "c": 0.12185,
    "h": 278
  },
  "luminance": 0.06876
}

Semantic roles & 50–950 ramp

primary

#3F428D

secondary

#B1AE77

accent

#CA5ACE

background

#F7F7FA

surface

#EEEDF4

border

#C9C8CE

text

#0A0810

muted

#7C7B7F

Preview Lab

Preview with #3F428D

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

Preview Lab → · Contrast checker → · Palette generator →