#6366E4#6366E4

#6366E4 is a mid, vivid blue. Relative luminance 0.178; OKLCH L 57.6% C 0.187 H 277.7°. Best body text is #FFFFFF at 4.61:1 contrast (WCAG AA passes).

Color values

HEX	#6366E4
RGB	rgb(99, 102, 228)
HSL	hsl(239, 70%, 64%)
HSV	hsv(239, 57%, 89%)
CMYK	cmyk(56.6%, 55.3%, 0%, 10.6%)
CIE-LAB	lab(49.20, 34.55, -64.65)
CIE-LCH	lch(49.20, 73.30, 298.12°)
OKLab	oklab(57.58% 0.0252 -0.1853)
OKLCH	oklch(57.58% 0.187 277.7)
XYZ	xyz(23.8961, 17.7552, 75.5516)
Luminance	0.1776 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#6366E4 #E4E163

analogous

#63A7E4 #6366E4 #A163E4

triadic

#6366E4 #E46366 #66E463

tetradic

#6366E4 #E463A7 #E4E163 #63E4A1

square

#6366E4 #E463A7 #E4E163 #63E4A1

split-complementary

#6366E4 #E4A163 #A7E463

monochromatic

#1E22AE #2F33DB #6366E4 #9799ED #CBCCF6

Accessibility & contrast

On white

4.61

#6366E4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.55

#6366E4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #6366E4

4.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##6366E4	#FFFFFF	#000000	##FFFFFF
##6366E4	1.00	4.61	4.55	4.61
#FFFFFF	4.61	1.00	21.00	1.00
#000000	4.55	21.00	1.00	21.00
##FFFFFF	4.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#007AE8

Deuteranopia (green-blind)

#0070E1

Tritanopia (blue-blind)

#15839B

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #6366e4;
/* rgb */ color: rgb(99, 102, 228);
/* oklch */ color: oklch(57.6% 0.187 277.7);

Tailwind

colors: {
  custom: {
    50: '#9a91ed',
    500: '#6366e4',
    950: '#000000',
  },
}

SCSS

$custom: #6366e4;
$custom-light: #9a91ed;
$custom-dark: #000000;

JSON

{
  "hex": "#6366e4",
  "rgb": {
    "r": 99,
    "g": 102,
    "b": 228
  },
  "hsl": {
    "h": 238.605,
    "s": 70.492,
    "l": 64.118
  },
  "oklch": {
    "l": 0.57583,
    "c": 0.18702,
    "h": 277.7
  },
  "luminance": 0.17757
}

Semantic roles & 50–950 ramp

primary

#6366E4

secondary

#E8E7BB

accent

#CE13D3

background

#FAF8FE

surface

#F3F0FD

border

#CDCBD5

text

#0F0D16

muted

#7F7D84

Preview Lab

Preview with #6366E4

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

Preview Lab → · Contrast checker → · Palette generator →