#3F37BB#3F37BB

#3F37BB is a dark, vivid blue. Relative luminance 0.074; OKLCH L 43.8% C 0.198 H 277.1°. Best body text is #FFFFFF at 8.48:1 contrast (WCAG AA passes).

Color values

HEX	#3F37BB
RGB	rgb(63, 55, 187)
HSL	hsl(244, 55%, 47%)
HSV	hsv(244, 71%, 73%)
CMYK	cmyk(66.3%, 70.6%, 0%, 26.7%)
CIE-LAB	lab(32.65, 43.78, -68.10)
CIE-LCH	lch(32.65, 80.96, 302.74°)
OKLab	oklab(43.8% 0.0244 -0.1966)
OKLCH	oklch(43.8% 0.198 277.1)
XYZ	xyz(12.3828, 7.3759, 47.7752)
Luminance	0.0738 (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

#3F37BB #B3BB37

analogous

#3771BB #3F37BB #8137BB

triadic

#3F37BB #BB3F37 #37BB3F

tetradic

#3F37BB #BB3771 #B3BB37 #37BB81

square

#3F37BB #BB3771 #B3BB37 #37BB81

split-complementary

#3F37BB #BB8137 #71BB37

monochromatic

#1F1B5C #2F298C #3F37BB #665FD0 #938EDE

Accessibility & contrast

On white

8.48

#3F37BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.48

#3F37BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37BB

8.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37BB	#FFFFFF	#000000	##FFFFFF
##3F37BB	1.00	8.48	2.48	8.48
#FFFFFF	8.48	1.00	21.00	1.00
#000000	2.48	21.00	1.00	21.00
##FFFFFF	8.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052BF

Deuteranopia (green-blind)

#0047B9

Tritanopia (blue-blind)

#005B75

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #3f37bb;
/* rgb */ color: rgb(63, 55, 187);
/* oklch */ color: oklch(43.8% 0.198 277.1);

Tailwind

colors: {
  custom: {
    50: '#846fd1',
    500: '#3f37bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f37bb;
$custom-light: #846fd1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37bb",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 187
  },
  "hsl": {
    "h": 243.636,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.43801,
    "c": 0.19816,
    "h": 277.1
  },
  "luminance": 0.07377
}

Semantic roles & 50–950 ramp

primary

#3F37BB

secondary

#C4C985

accent

#DE4AD5

background

#F8F6FD

surface

#F0ECFA

border

#CBC7D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #3F37BB

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

Preview Lab → · Contrast checker → · Palette generator →