#6366E1#6366E1

#6366E1 is a mid, vivid blue. Relative luminance 0.176; OKLCH L 57.4% C 0.183 H 277.9°. Best body text is #FFFFFF at 4.65:1 contrast (WCAG AA passes).

Color values

HEX	#6366E1
RGB	rgb(99, 102, 225)
HSL	hsl(239, 68%, 64%)
HSV	hsv(239, 56%, 88%)
CMYK	cmyk(56%, 54.7%, 0%, 11.8%)
CIE-LAB	lab(48.99, 33.59, -63.29)
CIE-LCH	lch(48.99, 71.65, 297.96°)
OKLab	oklab(57.37% 0.0251 -0.1813)
OKLCH	oklch(57.37% 0.183 277.9)
XYZ	xyz(23.4832, 17.5900, 73.3773)
Luminance	0.1759 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#6366E1 #E1DE63

analogous

#63A5E1 #6366E1 #9F63E1

triadic

#6366E1 #E16366 #66E163

tetradic

#6366E1 #E163A5 #E1DE63 #63E19F

square

#6366E1 #E163A5 #E1DE63 #63E19F

split-complementary

#6366E1 #E19F63 #A5E163

monochromatic

#2124A9 #3034D7 #6366E1 #9698EB #CACBF5

Accessibility & contrast

On white

4.65

#6366E1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.52

#6366E1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #6366E1

4.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##6366E1	#FFFFFF	#000000	##FFFFFF
##6366E1	1.00	4.65	4.52	4.65
#FFFFFF	4.65	1.00	21.00	1.00
#000000	4.52	21.00	1.00	21.00
##FFFFFF	4.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0F7AE5

Deuteranopia (green-blind)

#006FDE

Tritanopia (blue-blind)

#1C829A

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #6366e1;
/* rgb */ color: rgb(99, 102, 225);
/* oklch */ color: oklch(57.4% 0.183 277.9);

Tailwind

colors: {
  custom: {
    50: '#9991eb',
    500: '#6366e1',
    950: '#000000',
  },
}

SCSS

$custom: #6366e1;
$custom-light: #9991eb;
$custom-dark: #000000;

JSON

{
  "hex": "#6366e1",
  "rgb": {
    "r": 99,
    "g": 102,
    "b": 225
  },
  "hsl": {
    "h": 238.571,
    "s": 67.742,
    "l": 63.529
  },
  "oklch": {
    "l": 0.57367,
    "c": 0.18304,
    "h": 277.9
  },
  "luminance": 0.17592
}

Semantic roles & 50–950 ramp

primary

#6366E1

secondary

#E6E5BA

accent

#CB16D0

background

#FAF8FE

surface

#F3F0FD

border

#CDCBD5

text

#0F0D16

muted

#7F7D84

Preview Lab

Preview with #6366E1

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

Preview Lab → · Contrast checker → · Palette generator →