#6366E3#6366E3

#6366E3 is a mid, vivid blue. Relative luminance 0.177; OKLCH L 57.5% C 0.186 H 277.8°. Best body text is #FFFFFF at 4.63:1 contrast (WCAG AA passes).

Color values

HEX	#6366E3
RGB	rgb(99, 102, 227)
HSL	hsl(239, 70%, 64%)
HSV	hsv(239, 56%, 89%)
CMYK	cmyk(56.4%, 55.1%, 0%, 11%)
CIE-LAB	lab(49.13, 34.23, -64.20)
CIE-LCH	lch(49.13, 72.75, 298.07°)
OKLab	oklab(57.51% 0.0252 -0.184)
OKLCH	oklch(57.51% 0.186 277.8)
XYZ	xyz(23.7577, 17.6998, 74.8226)
Luminance	0.1770 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#6366E3 #E3E063

analogous

#63A6E3 #6366E3 #A063E3

triadic

#6366E3 #E36366 #66E363

tetradic

#6366E3 #E363A6 #E3E063 #63E3A0

square

#6366E3 #E363A6 #E3E063 #63E3A0

split-complementary

#6366E3 #E3A063 #A6E363

monochromatic

#1F22AD #2F33DA #6366E3 #9799EC #CBCCF6

Accessibility & contrast

On white

4.63

#6366E3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.54

#6366E3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #6366E3

4.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##6366E3	#FFFFFF	#000000	##FFFFFF
##6366E3	1.00	4.63	4.54	4.63
#FFFFFF	4.63	1.00	21.00	1.00
#000000	4.54	21.00	1.00	21.00
##FFFFFF	4.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#057AE7

Deuteranopia (green-blind)

#0070E0

Tritanopia (blue-blind)

#18839B

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #6366e3;
/* rgb */ color: rgb(99, 102, 227);
/* oklch */ color: oklch(57.5% 0.186 277.8);

Tailwind

colors: {
  custom: {
    50: '#9a91ed',
    500: '#6366e3',
    950: '#000000',
  },
}

SCSS

$custom: #6366e3;
$custom-light: #9a91ed;
$custom-dark: #000000;

JSON

{
  "hex": "#6366e3",
  "rgb": {
    "r": 99,
    "g": 102,
    "b": 227
  },
  "hsl": {
    "h": 238.594,
    "s": 69.565,
    "l": 63.922
  },
  "oklch": {
    "l": 0.57511,
    "c": 0.1857,
    "h": 277.8
  },
  "luminance": 0.17701
}

Semantic roles & 50–950 ramp

primary

#6366E3

secondary

#E7E6BA

accent

#CD14D2

background

#FAF8FE

surface

#F3F0FD

border

#CDCBD5

text

#0F0D16

muted

#7F7D84

Preview Lab

Preview with #6366E3

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

Preview Lab → · Contrast checker → · Palette generator →