#3F37C8#3F37C8

#3F37C8 is a mid, highly saturated blue. Relative luminance 0.080; OKLCH L 45.1% C 0.214 H 275.9°. Best body text is #FFFFFF at 8.10:1 contrast (WCAG AA passes).

Color values

HEX	#3F37C8
RGB	rgb(63, 55, 200)
HSL	hsl(243, 57%, 50%)
HSV	hsv(243, 73%, 78%)
CMYK	cmyk(68.5%, 72.5%, 0%, 21.6%)
CIE-LAB	lab(33.90, 47.97, -73.68)
CIE-LCH	lch(33.90, 87.92, 303.07°)
OKLab	oklab(45.07% 0.0221 -0.2129)
OKLCH	oklch(45.07% 0.214 275.9)
XYZ	xyz(13.8380, 7.9580, 55.4392)
Luminance	0.0796 (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

#3F37C8 #C0C837

analogous

#3778C8 #3F37C8 #8737C8

triadic

#3F37C8 #C83F37 #37C83F

tetradic

#3F37C8 #C83778 #C0C837 #37C887

square

#3F37C8 #C83778 #C0C837 #37C887

split-complementary

#3F37C8 #C88737 #78C837

monochromatic

#211D68 #302A98 #3F37C8 #6D67D5 #9B97E2

Accessibility & contrast

On white

8.10

#3F37C8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.59

#3F37C8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F37C8

8.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F37C8	#FFFFFF	#000000	##FFFFFF
##3F37C8	1.00	8.10	2.59	8.10
#FFFFFF	8.10	1.00	21.00	1.00
#000000	2.59	21.00	1.00	21.00
##FFFFFF	8.10	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0056CC

Deuteranopia (green-blind)

#0049C5

Tritanopia (blue-blind)

#00607C

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3f37c8;
/* rgb */ color: rgb(63, 55, 200);
/* oklch */ color: oklch(45.1% 0.214 275.9);

Tailwind

colors: {
  custom: {
    50: '#8770da',
    500: '#3f37c8',
    950: '#000000',
  },
}

SCSS

$custom: #3f37c8;
$custom-light: #8770da;
$custom-dark: #000000;

JSON

{
  "hex": "#3f37c8",
  "rgb": {
    "r": 63,
    "g": 55,
    "b": 200
  },
  "hsl": {
    "h": 243.31,
    "s": 56.863,
    "l": 50
  },
  "oklch": {
    "l": 0.45067,
    "c": 0.21408,
    "h": 275.9
  },
  "luminance": 0.07959
}

Semantic roles & 50–950 ramp

primary

#3F37C8

secondary

#CACE8D

accent

#E048D8

background

#F9F6FD

surface

#F1ECFB

border

#CBC7D4

text

#0D0715

muted

#7E7A83

Preview Lab

Preview with #3F37C8

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

Preview Lab → · Contrast checker → · Palette generator →