#3F40AF#3F40AF

#3F40AF is a dark, vivid blue. Relative luminance 0.078; OKLCH L 44.2% C 0.172 H 276.3°. Best body text is #FFFFFF at 8.19:1 contrast (WCAG AA passes).

Color values

HEX	#3F40AF
RGB	rgb(63, 64, 175)
HSL	hsl(239, 47%, 47%)
HSV	hsv(239, 64%, 69%)
CMYK	cmyk(64%, 63.4%, 0%, 31.4%)
CIE-LAB	lab(33.60, 34.35, -59.43)
CIE-LCH	lch(33.60, 68.64, 300.03°)
OKLab	oklab(44.16% 0.019 -0.1712)
OKLCH	oklch(44.16% 0.172 276.3)
XYZ	xyz(11.6186, 7.8177, 41.4458)
Luminance	0.0782 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F40AF #AFAE3F

analogous

#3F78AF #3F40AF #763FAF

triadic

#3F40AF #AF3F40 #40AF3F

tetradic

#3F40AF #AF3F78 #AFAE3F #3FAF76

square

#3F40AF #AF3F78 #AFAE3F #3FAF76

split-complementary

#3F40AF #AF763F #78AF3F

monochromatic

#1F1F55 #2F3082 #3F40AF #6465C7 #9192D7

Accessibility & contrast

On white

8.19

#3F40AF on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.56

#3F40AF on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40AF

8.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40AF	#FFFFFF	#000000	##FFFFFF
##3F40AF	1.00	8.19	2.56	8.19
#FFFFFF	8.19	1.00	21.00	1.00
#000000	2.56	21.00	1.00	21.00
##FFFFFF	8.19	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0054B3

Deuteranopia (green-blind)

#004AAD

Tritanopia (blue-blind)

#005C71

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #3f40af;
/* rgb */ color: rgb(63, 64, 175);
/* oklch */ color: oklch(44.2% 0.172 276.3);

Tailwind

colors: {
  custom: {
    50: '#8175c8',
    500: '#3f40af',
    950: '#000000',
  },
}

SCSS

$custom: #3f40af;
$custom-light: #8175c8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40af",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 175
  },
  "hsl": {
    "h": 239.464,
    "s": 47.059,
    "l": 46.667
  },
  "oklch": {
    "l": 0.44164,
    "c": 0.17227,
    "h": 276.3
  },
  "luminance": 0.07819
}

Semantic roles & 50–950 ramp

primary

#3F40AF

secondary

#C3C287

accent

#D551D7

background

#F8F7FC

surface

#F0EDF8

border

#CBC8D1

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #3F40AF

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

Preview Lab → · Contrast checker → · Palette generator →