#3F37B1#3F37B1

#3F37B1 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 42.9% C 0.186 H 278.0°. Best body text is #FFFFFF at 8.78:1 contrast (WCAG AA passes).

Color values

HEX	#3F37B1
RGB	rgb(63, 55, 177)
HSL	hsl(244, 53%, 45%)
HSV	hsv(244, 69%, 69%)
CMYK	cmyk(64.4%, 68.9%, 0%, 30.6%)
CIE-LAB	lab(31.72, 40.52, -63.69)
CIE-LCH	lch(31.72, 75.49, 302.46°)
OKLab	oklab(42.85% 0.026 -0.1837)
OKLCH	oklch(42.85% 0.186 278)
XYZ	xyz(11.3493, 6.9625, 42.3323)
Luminance	0.0696 (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

#3F37B1 #A9B137

analogous

#376CB1 #3F37B1 #7C37B1

triadic

#3F37B1 #B13F37 #37B13F

tetradic

#3F37B1 #B1376C #A9B137 #37B17C

square

#3F37B1 #B1376C #A9B137 #37B17C

split-complementary

#3F37B1 #B17C37 #6CB137

monochromatic

#1E1A54 #2E2882 #3F37B1 #615ACC #8E88DA

Accessibility & contrast

On white

8.78

#3F37B1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.39

#3F37B1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37B1

8.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37B1	#FFFFFF	#000000	##FFFFFF
##3F37B1	1.00	8.78	2.39	8.78
#FFFFFF	8.78	1.00	21.00	1.00
#000000	2.39	21.00	1.00	21.00
##FFFFFF	8.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050B5

Deuteranopia (green-blind)

#0046AF

Tritanopia (blue-blind)

#00586F

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #3f37b1;
/* rgb */ color: rgb(63, 55, 177);
/* oklch */ color: oklch(42.9% 0.186 278.0);

Tailwind

colors: {
  custom: {
    50: '#826fc9',
    500: '#3f37b1',
    950: '#000000',
  },
}

SCSS

$custom: #3f37b1;
$custom-light: #826fc9;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37b1",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 177
  },
  "hsl": {
    "h": 243.934,
    "s": 52.586,
    "l": 45.49
  },
  "oklch": {
    "l": 0.42853,
    "c": 0.18557,
    "h": 278
  },
  "luminance": 0.06963
}

Semantic roles & 50–950 ramp

primary

#3F37B1

secondary

#C0C480

accent

#DC4CD3

background

#F8F6FC

surface

#F0ECF8

border

#CBC7D1

text

#0C0713

muted

#7D7A82

Preview Lab

Preview with #3F37B1

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

Preview Lab → · Contrast checker → · Palette generator →