#3F40AB#3F40AB

#3F40AB is a dark, vivid blue. Relative luminance 0.077; OKLCH L 43.8% C 0.167 H 276.6°. Best body text is #FFFFFF at 8.29:1 contrast (WCAG AA passes).

Color values

HEX	#3F40AB
RGB	rgb(63, 64, 171)
HSL	hsl(239, 46%, 46%)
HSV	hsv(239, 63%, 67%)
CMYK	cmyk(63.2%, 62.6%, 0%, 32.9%)
CIE-LAB	lab(33.27, 32.99, -57.58)
CIE-LCH	lch(33.27, 66.36, 299.81°)
OKLab	oklab(43.82% 0.0192 -0.1658)
OKLCH	oklch(43.82% 0.167 276.6)
XYZ	xyz(11.2316, 7.6629, 39.4074)
Luminance	0.0766 (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

#3F40AB #ABAA3F

analogous

#3F76AB #3F40AB #743FAB

triadic

#3F40AB #AB3F40 #40AB3F

tetradic

#3F40AB #AB3F76 #ABAA3F #3FAB74

square

#3F40AB #AB3F76 #ABAA3F #3FAB74

split-complementary

#3F40AB #AB743F #76AB3F

monochromatic

#1E1F52 #2F2F7E #3F40AB #6263C5 #8F8FD6

Accessibility & contrast

On white

8.29

#3F40AB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.53

#3F40AB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40AB

8.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40AB	#FFFFFF	#000000	##FFFFFF
##3F40AB	1.00	8.29	2.53	8.29
#FFFFFF	8.29	1.00	21.00	1.00
#000000	2.53	21.00	1.00	21.00
##FFFFFF	8.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053AE

Deuteranopia (green-blind)

#004AA9

Tritanopia (blue-blind)

#005B6F

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #3f40ab;
/* rgb */ color: rgb(63, 64, 171);
/* oklch */ color: oklch(43.8% 0.167 276.6);

Tailwind

colors: {
  custom: {
    50: '#8075c5',
    500: '#3f40ab',
    950: '#000000',
  },
}

SCSS

$custom: #3f40ab;
$custom-light: #8075c5;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40ab",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 171
  },
  "hsl": {
    "h": 239.444,
    "s": 46.154,
    "l": 45.882
  },
  "oklch": {
    "l": 0.4382,
    "c": 0.1669,
    "h": 276.6
  },
  "luminance": 0.07664
}

Semantic roles & 50–950 ramp

primary

#3F40AB

secondary

#C1C085

accent

#D552D6

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #3F40AB

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

Preview Lab → · Contrast checker → · Palette generator →