#3F37B3#3F37B3

#3F37B3 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 43.0% C 0.188 H 277.8°. Best body text is #FFFFFF at 8.72:1 contrast (WCAG AA passes).

Color values

HEX	#3F37B3
RGB	rgb(63, 55, 179)
HSL	hsl(244, 53%, 46%)
HSV	hsv(244, 69%, 70%)
CMYK	cmyk(64.8%, 69.3%, 0%, 29.8%)
CIE-LAB	lab(31.90, 41.17, -64.58)
CIE-LCH	lch(31.90, 76.59, 302.52°)
OKLab	oklab(43.04% 0.0257 -0.1864)
OKLCH	oklch(43.04% 0.188 277.8)
XYZ	xyz(11.5501, 7.0429, 43.3898)
Luminance	0.0704 (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

#3F37B3 #ABB337

analogous

#376DB3 #3F37B3 #7D37B3

triadic

#3F37B3 #B33F37 #37B33F

tetradic

#3F37B3 #B3376D #ABB337 #37B37D

square

#3F37B3 #B3376D #ABB337 #37B37D

split-complementary

#3F37B3 #B37D37 #6DB337

monochromatic

#1E1A55 #2F2984 #3F37B3 #625BCD #8F8ADB

Accessibility & contrast

On white

8.72

#3F37B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.41

#3F37B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37B3

8.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37B3	#FFFFFF	#000000	##FFFFFF
##3F37B3	1.00	8.72	2.41	8.72
#FFFFFF	8.72	1.00	21.00	1.00
#000000	2.41	21.00	1.00	21.00
##FFFFFF	8.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050B7

Deuteranopia (green-blind)

#0046B1

Tritanopia (blue-blind)

#005871

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #3f37b3;
/* rgb */ color: rgb(63, 55, 179);
/* oklch */ color: oklch(43.0% 0.188 277.8);

Tailwind

colors: {
  custom: {
    50: '#826fcb',
    500: '#3f37b3',
    950: '#000000',
  },
}

SCSS

$custom: #3f37b3;
$custom-light: #826fcb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37b3",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 179
  },
  "hsl": {
    "h": 243.871,
    "s": 52.991,
    "l": 45.882
  },
  "oklch": {
    "l": 0.43041,
    "c": 0.18812,
    "h": 277.8
  },
  "luminance": 0.07044
}

Semantic roles & 50–950 ramp

primary

#3F37B3

secondary

#C1C581

accent

#DC4BD3

background

#F8F6FC

surface

#F0ECF9

border

#CBC7D2

text

#0C0713

muted

#7D7A82

Preview Lab

Preview with #3F37B3

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

Preview Lab → · Contrast checker → · Palette generator →