#6366E9#6366E9

#6366E9 is a mid, vivid blue. Relative luminance 0.180; OKLCH L 57.9% C 0.194 H 277.5°. Best body text is #000000 at 4.61:1 contrast (WCAG AA passes).

Color values

HEX	#6366E9
RGB	rgb(99, 102, 233)
HSL	hsl(239, 75%, 65%)
HSV	hsv(239, 58%, 91%)
CMYK	cmyk(57.5%, 56.2%, 0%, 8.6%)
CIE-LAB	lab(49.54, 36.14, -66.91)
CIE-LCH	lch(49.54, 76.05, 298.37°)
OKLab	oklab(57.95% 0.0253 -0.192)
OKLCH	oklch(57.95% 0.194 277.5)
XYZ	xyz(24.6002, 18.0368, 79.2601)
Luminance	0.1804 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#6366E9 #E9E663

analogous

#63A9E9 #6366E9 #A363E9

triadic

#6366E9 #E96366 #66E963

tetradic

#6366E9 #E963A9 #E9E663 #63E9A3

square

#6366E9 #E963A9 #E9E663 #63E9A3

split-complementary

#6366E9 #E9A363 #A9E963

monochromatic

#1A1DB8 #2D31E1 #6366E9 #999BF1 #CECFF8

Accessibility & contrast

On white

4.56

#6366E9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.61

#6366E9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #6366E9

4.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##6366E9	#FFFFFF	#000000	##000000
##6366E9	1.00	4.56	4.61	4.61
#FFFFFF	4.56	1.00	21.00	21.00
#000000	4.61	21.00	1.00	1.00
##000000	4.61	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#007BED

Deuteranopia (green-blind)

#0070E6

Tritanopia (blue-blind)

#03859E

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #6366e9;
/* rgb */ color: rgb(99, 102, 233);
/* oklch */ color: oklch(57.9% 0.194 277.5);

Tailwind

colors: {
  custom: {
    50: '#9b91f1',
    500: '#6366e9',
    950: '#000000',
  },
}

SCSS

$custom: #6366e9;
$custom-light: #9b91f1;
$custom-dark: #000000;

JSON

{
  "hex": "#6366e9",
  "rgb": {
    "r": 99,
    "g": 102,
    "b": 233
  },
  "hsl": {
    "h": 238.657,
    "s": 75.281,
    "l": 65.098
  },
  "oklch": {
    "l": 0.57947,
    "c": 0.19363,
    "h": 277.5
  },
  "luminance": 0.18039
}

Semantic roles & 50–950 ramp

primary

#6366E9

secondary

#EBEABD

accent

#D30ED7

background

#FAF8FE

surface

#F4F0FD

border

#CECBD5

text

#0F0D17

muted

#7F7D85

Preview Lab

Preview with #6366E9

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

Preview Lab → · Contrast checker → · Palette generator →