#3F37BA#3F37BA

#3F37BA is a dark, vivid blue. Relative luminance 0.073; OKLCH L 43.7% C 0.197 H 277.2°. Best body text is #FFFFFF at 8.51:1 contrast (WCAG AA passes).

Color values

HEX	#3F37BA
RGB	rgb(63, 55, 186)
HSL	hsl(244, 54%, 47%)
HSV	hsv(244, 70%, 73%)
CMYK	cmyk(66.1%, 70.4%, 0%, 27.1%)
CIE-LAB	lab(32.55, 43.46, -67.67)
CIE-LCH	lch(32.55, 80.42, 302.71°)
OKLab	oklab(43.71% 0.0246 -0.1954)
OKLCH	oklch(43.71% 0.197 277.2)
XYZ	xyz(12.2761, 7.3333, 47.2134)
Luminance	0.0733 (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

#3F37BA #B2BA37

analogous

#3771BA #3F37BA #8137BA

triadic

#3F37BA #BA3F37 #37BA3F

tetradic

#3F37BA #BA3771 #B2BA37 #37BA81

square

#3F37BA #BA3771 #B2BA37 #37BA81

split-complementary

#3F37BA #BA8137 #71BA37

monochromatic

#1F1B5C #2F298B #3F37BA #665FD0 #938EDE

Accessibility & contrast

On white

8.51

#3F37BA on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.47

#3F37BA on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37BA

8.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37BA	#FFFFFF	#000000	##FFFFFF
##3F37BA	1.00	8.51	2.47	8.51
#FFFFFF	8.51	1.00	21.00	1.00
#000000	2.47	21.00	1.00	21.00
##FFFFFF	8.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052BE

Deuteranopia (green-blind)

#0047B8

Tritanopia (blue-blind)

#005B74

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #3f37ba;
/* rgb */ color: rgb(63, 55, 186);
/* oklch */ color: oklch(43.7% 0.197 277.2);

Tailwind

colors: {
  custom: {
    50: '#846fd0',
    500: '#3f37ba',
    950: '#000000',
  },
}

SCSS

$custom: #3f37ba;
$custom-light: #846fd0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37ba",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 186
  },
  "hsl": {
    "h": 243.664,
    "s": 54.357,
    "l": 47.255
  },
  "oklch": {
    "l": 0.43705,
    "c": 0.19691,
    "h": 277.2
  },
  "luminance": 0.07334
}

Semantic roles & 50–950 ramp

primary

#3F37BA

secondary

#C4C885

accent

#DE4AD5

background

#F8F6FC

surface

#F0ECF9

border

#CBC7D2

text

#0C0714

muted

#7D7A82

Preview Lab

Preview with #3F37BA

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

Preview Lab → · Contrast checker → · Palette generator →