#3F40B4#3F40B4

#3F40B4 is a dark, vivid blue. Relative luminance 0.080; OKLCH L 44.6% C 0.179 H 276.0°. Best body text is #FFFFFF at 8.07:1 contrast (WCAG AA passes).

Color values

HEX	#3F40B4
RGB	rgb(63, 64, 180)
HSL	hsl(239, 48%, 48%)
HSV	hsv(239, 65%, 71%)
CMYK	cmyk(65%, 64.4%, 0%, 29.4%)
CIE-LAB	lab(34.02, 36.05, -61.71)
CIE-LCH	lch(34.02, 71.47, 300.30°)
OKLab	oklab(44.6% 0.0186 -0.1779)
OKLCH	oklch(44.6% 0.179 276)
XYZ	xyz(12.1188, 8.0178, 44.0801)
Luminance	0.0802 (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

#3F40B4 #B4B33F

analogous

#3F7BB4 #3F40B4 #783FB4

triadic

#3F40B4 #B43F40 #40B43F

tetradic

#3F40B4 #B43F7B #B4B33F #3FB478

square

#3F40B4 #B43F7B #B4B33F #3FB478

split-complementary

#3F40B4 #B4783F #7BB43F

monochromatic

#1F2059 #2F3087 #3F40B4 #6767CA #9494DA

Accessibility & contrast

On white

8.07

#3F40B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.60

#3F40B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40B4

8.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40B4	#FFFFFF	#000000	##FFFFFF
##3F40B4	1.00	8.07	2.60	8.07
#FFFFFF	8.07	1.00	21.00	1.00
#000000	2.60	21.00	1.00	21.00
##FFFFFF	8.07	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0055B8

Deuteranopia (green-blind)

#004BB2

Tritanopia (blue-blind)

#005E74

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3f40b4;
/* rgb */ color: rgb(63, 64, 180);
/* oklch */ color: oklch(44.6% 0.179 276.0);

Tailwind

colors: {
  custom: {
    50: '#8275cb',
    500: '#3f40b4',
    950: '#000000',
  },
}

SCSS

$custom: #3f40b4;
$custom-light: #8275cb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40b4",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 180
  },
  "hsl": {
    "h": 239.487,
    "s": 48.148,
    "l": 47.647
  },
  "oklch": {
    "l": 0.44601,
    "c": 0.17889,
    "h": 276
  },
  "luminance": 0.08019
}

Semantic roles & 50–950 ramp

primary

#3F40B4

secondary

#C5C48A

accent

#D750D8

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0813

muted

#7D7B82

Preview Lab

Preview with #3F40B4

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

Preview Lab → · Contrast checker → · Palette generator →