#3F37AD#3F37AD

#3F37AD is a dark, vivid blue. Relative luminance 0.068; OKLCH L 42.5% C 0.180 H 278.4°. Best body text is #FFFFFF at 8.89:1 contrast (WCAG AA passes).

Color values

HEX	#3F37AD
RGB	rgb(63, 55, 173)
HSL	hsl(244, 52%, 45%)
HSV	hsv(244, 68%, 68%)
CMYK	cmyk(63.6%, 68.2%, 0%, 32.2%)
CIE-LAB	lab(31.36, 39.20, -61.90)
CIE-LCH	lch(31.36, 73.27, 302.35°)
OKLab	oklab(42.48% 0.0265 -0.1785)
OKLCH	oklch(42.48% 0.18 278.4)
XYZ	xyz(10.9565, 6.8054, 40.2633)
Luminance	0.0681 (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

#3F37AD #A5AD37

analogous

#376AAD #3F37AD #7A37AD

triadic

#3F37AD #AD3F37 #37AD3F

tetradic

#3F37AD #AD376A #A5AD37 #37AD7A

square

#3F37AD #AD376A #A5AD37 #37AD7A

split-complementary

#3F37AD #AD7A37 #6AAD37

monochromatic

#1D1950 #2E287F #3F37AD #5F57CA #8C86D8

Accessibility & contrast

On white

8.89

#3F37AD on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.36

#3F37AD on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37AD

8.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37AD	#FFFFFF	#000000	##FFFFFF
##3F37AD	1.00	8.89	2.36	8.89
#FFFFFF	8.89	1.00	21.00	1.00
#000000	2.36	21.00	1.00	21.00
##FFFFFF	8.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004FB1

Deuteranopia (green-blind)

#0045AB

Tritanopia (blue-blind)

#00566D

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #3f37ad;
/* rgb */ color: rgb(63, 55, 173);
/* oklch */ color: oklch(42.5% 0.180 278.4);

Tailwind

colors: {
  custom: {
    50: '#816fc6',
    500: '#3f37ad',
    950: '#000000',
  },
}

SCSS

$custom: #3f37ad;
$custom-light: #816fc6;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37ad",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 173
  },
  "hsl": {
    "h": 244.068,
    "s": 51.754,
    "l": 44.706
  },
  "oklch": {
    "l": 0.42482,
    "c": 0.18046,
    "h": 278.4
  },
  "luminance": 0.06806
}

Semantic roles & 50–950 ramp

primary

#3F37AD

secondary

#BEC27D

accent

#DB4DD2

background

#F8F6FC

surface

#F0ECF8

border

#CBC7D1

text

#0C0713

muted

#7D7A82

Preview Lab

Preview with #3F37AD

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

Preview Lab → · Contrast checker → · Palette generator →