#3F40B2#3F40B2

#3F40B2 is a dark, vivid blue. Relative luminance 0.079; OKLCH L 44.4% C 0.176 H 276.1°. Best body text is #FFFFFF at 8.12:1 contrast (WCAG AA passes).

Color values

HEX	#3F40B2
RGB	rgb(63, 64, 178)
HSL	hsl(239, 48%, 47%)
HSV	hsv(239, 65%, 70%)
CMYK	cmyk(64.6%, 64%, 0%, 30.2%)
CIE-LAB	lab(33.85, 35.37, -60.80)
CIE-LCH	lch(33.85, 70.34, 300.19°)
OKLab	oklab(44.43% 0.0188 -0.1752)
OKLCH	oklch(44.43% 0.176 276.1)
XYZ	xyz(11.9166, 7.9369, 43.0148)
Luminance	0.0794 (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

#3F40B2 #B2B13F

analogous

#3F7AB2 #3F40B2 #773FB2

triadic

#3F40B2 #B23F40 #40B23F

tetradic

#3F40B2 #B23F7A #B2B13F #3FB277

square

#3F40B2 #B23F7A #B2B13F #3FB277

split-complementary

#3F40B2 #B2773F #7AB23F

monochromatic

#1F1F58 #2F3085 #3F40B2 #6666C9 #9393D9

Accessibility & contrast

On white

8.12

#3F40B2 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.59

#3F40B2 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40B2

8.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40B2	#FFFFFF	#000000	##FFFFFF
##3F40B2	1.00	8.12	2.59	8.12
#FFFFFF	8.12	1.00	21.00	1.00
#000000	2.59	21.00	1.00	21.00
##FFFFFF	8.12	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0055B6

Deuteranopia (green-blind)

#004BB0

Tritanopia (blue-blind)

#005D73

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3f40b2;
/* rgb */ color: rgb(63, 64, 178);
/* oklch */ color: oklch(44.4% 0.176 276.1);

Tailwind

colors: {
  custom: {
    50: '#8275ca',
    500: '#3f40b2',
    950: '#000000',
  },
}

SCSS

$custom: #3f40b2;
$custom-light: #8275ca;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40b2",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 178
  },
  "hsl": {
    "h": 239.478,
    "s": 47.718,
    "l": 47.255
  },
  "oklch": {
    "l": 0.44425,
    "c": 0.17625,
    "h": 276.1
  },
  "luminance": 0.07938
}

Semantic roles & 50–950 ramp

primary

#3F40B2

secondary

#C4C389

accent

#D650D7

background

#F8F7FC

surface

#F0EDF8

border

#CBC8D1

text

#0C0813

muted

#7D7B82

Preview Lab

Preview with #3F40B2

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

Preview Lab → · Contrast checker → · Palette generator →