#3F37BF#3F37BF

#3F37BF is a dark, highly saturated blue. Relative luminance 0.076; OKLCH L 44.2% C 0.203 H 276.7°. Best body text is #FFFFFF at 8.37:1 contrast (WCAG AA passes).

Color values

HEX	#3F37BF
RGB	rgb(63, 55, 191)
HSL	hsl(244, 55%, 48%)
HSV	hsv(244, 71%, 75%)
CMYK	cmyk(67%, 71.2%, 0%, 25.1%)
CIE-LAB	lab(33.03, 45.08, -69.84)
CIE-LCH	lch(33.03, 83.12, 302.84°)
OKLab	oklab(44.19% 0.0237 -0.2017)
OKLCH	oklch(44.19% 0.203 276.7)
XYZ	xyz(12.8170, 7.5496, 50.0619)
Luminance	0.0755 (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

#3F37BF #B7BF37

analogous

#3773BF #3F37BF #8337BF

triadic

#3F37BF #BF3F37 #37BF3F

tetradic

#3F37BF #BF3773 #B7BF37 #37BF83

square

#3F37BF #BF3773 #B7BF37 #37BF83

split-complementary

#3F37BF #BF8337 #73BF37

monochromatic

#201C60 #2F298F #3F37BF #6862D2 #9691DF

Accessibility & contrast

On white

8.37

#3F37BF on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.51

#3F37BF on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37BF

8.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37BF	#FFFFFF	#000000	##FFFFFF
##3F37BF	1.00	8.37	2.51	8.37
#FFFFFF	8.37	1.00	21.00	1.00
#000000	2.51	21.00	1.00	21.00
##FFFFFF	8.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053C3

Deuteranopia (green-blind)

#0048BC

Tritanopia (blue-blind)

#005D77

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #3f37bf;
/* rgb */ color: rgb(63, 55, 191);
/* oklch */ color: oklch(44.2% 0.203 276.7);

Tailwind

colors: {
  custom: {
    50: '#856fd4',
    500: '#3f37bf',
    950: '#000000',
  },
}

SCSS

$custom: #3f37bf;
$custom-light: #856fd4;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37bf",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 191
  },
  "hsl": {
    "h": 243.529,
    "s": 55.285,
    "l": 48.235
  },
  "oklch": {
    "l": 0.44186,
    "c": 0.2031,
    "h": 276.7
  },
  "luminance": 0.07551
}

Semantic roles & 50–950 ramp

primary

#3F37BF

secondary

#C6CA88

accent

#DF49D6

background

#F8F6FD

surface

#F0ECFA

border

#CBC7D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #3F37BF

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

Preview Lab → · Contrast checker → · Palette generator →