#3F40A2#3F40A2

#3F40A2 is a dark, vivid blue. Relative luminance 0.073; OKLCH L 43.1% C 0.155 H 277.3°. Best body text is #FFFFFF at 8.51:1 contrast (WCAG AA passes).

Color values

HEX	#3F40A2
RGB	rgb(63, 64, 162)
HSL	hsl(239, 44%, 44%)
HSV	hsv(239, 61%, 64%)
CMYK	cmyk(61.1%, 60.5%, 0%, 36.5%)
CIE-LAB	lab(32.55, 29.90, -53.35)
CIE-LCH	lch(32.55, 61.16, 299.27°)
OKLab	oklab(43.06% 0.0196 -0.1534)
OKLCH	oklch(43.06% 0.155 277.3)
XYZ	xyz(10.4028, 7.3314, 35.0423)
Luminance	0.0733 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 6.33

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F40A2 #A2A13F

analogous

#3F72A2 #3F40A2 #703FA2

triadic

#3F40A2 #A23F40 #40A23F

tetradic

#3F40A2 #A23F72 #A2A13F #3FA270

square

#3F40A2 #A23F72 #A2A13F #3FA270

split-complementary

#3F40A2 #A2703F #72A23F

monochromatic

#1D1D4A #2E2F76 #3F40A2 #5E5FC0 #8A8BD1

Accessibility & contrast

On white

8.51

#3F40A2 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.47

#3F40A2 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40A2

8.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40A2	#FFFFFF	#000000	##FFFFFF
##3F40A2	1.00	8.51	2.47	8.51
#FFFFFF	8.51	1.00	21.00	1.00
#000000	2.47	21.00	1.00	21.00
##FFFFFF	8.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051A5

Deuteranopia (green-blind)

#0048A0

Tritanopia (blue-blind)

#00586A

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #3f40a2;
/* rgb */ color: rgb(63, 64, 162);
/* oklch */ color: oklch(43.1% 0.155 277.3);

Tailwind

colors: {
  custom: {
    50: '#7e75be',
    500: '#3f40a2',
    950: '#000000',
  },
}

SCSS

$custom: #3f40a2;
$custom-light: #7e75be;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40a2",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 162
  },
  "hsl": {
    "h": 239.394,
    "s": 44,
    "l": 44.118
  },
  "oklch": {
    "l": 0.43063,
    "c": 0.15461,
    "h": 277.3
  },
  "luminance": 0.07332
}

Semantic roles & 50–950 ramp

primary

#3F40A2

secondary

#BCBC81

accent

#D254D4

background

#F8F7FB

surface

#EFEDF7

border

#CAC8D0

text

#0B0812

muted

#7C7B81

Preview Lab

Preview with #3F40A2

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

Preview Lab → · Contrast checker → · Palette generator →