#6366F3#6366F3

#6366F3 is a mid, highly saturated blue. Relative luminance 0.186; OKLCH L 58.7% C 0.207 H 277.0°. Best body text is #000000 at 4.73:1 contrast (WCAG AA passes).

Color values

HEX	#6366F3
RGB	rgb(99, 102, 243)
HSL	hsl(239, 86%, 67%)
HSV	hsv(239, 59%, 95%)
CMYK	cmyk(59.3%, 58%, 0%, 4.7%)
CIE-LAB	lab(50.24, 39.32, -71.37)
CIE-LCH	lch(50.24, 81.49, 298.85°)
OKLab	oklab(58.69% 0.0253 -0.2051)
OKLCH	oklch(58.69% 0.207 277)
XYZ	xyz(26.0694, 18.6245, 86.9978)
Luminance	0.1863 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#6366F3 #F3F063

analogous

#63AEF3 #6366F3 #A863F3

triadic

#6366F3 #F36366 #66F363

tetradic

#6366F3 #F363AE #F3F063 #63F3A8

square

#6366F3 #F363AE #F3F063 #63F3A8

split-complementary

#6366F3 #F3A863 #AEF363

monochromatic

#1014CC #2A2EEF #6366F3 #9C9EF7 #D5D5FC

Accessibility & contrast

On white

4.44

#6366F3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.73

#6366F3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #6366F3

4.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##6366F3	#FFFFFF	#000000	##000000
##6366F3	1.00	4.44	4.73	4.73
#FFFFFF	4.44	1.00	21.00	21.00
#000000	4.73	21.00	1.00	1.00
##000000	4.73	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#007EF8

Deuteranopia (green-blind)

#0072F0

Tritanopia (blue-blind)

#0088A3

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #6366f3;
/* rgb */ color: rgb(99, 102, 243);
/* oklch */ color: oklch(58.7% 0.207 277.0);

Tailwind

colors: {
  custom: {
    50: '#9c92f8',
    500: '#6366f3',
    950: '#000000',
  },
}

SCSS

$custom: #6366f3;
$custom-light: #9c92f8;
$custom-dark: #000000;

JSON

{
  "hex": "#6366f3",
  "rgb": {
    "r": 99,
    "g": 102,
    "b": 243
  },
  "hsl": {
    "h": 238.75,
    "s": 85.714,
    "l": 67.059
  },
  "oklch": {
    "l": 0.58691,
    "c": 0.20664,
    "h": 277
  },
  "luminance": 0.18626
}

Semantic roles & 50–950 ramp

primary

#6366F3

secondary

#F0EFC2

accent

#DE03E2

background

#FAF8FF

surface

#F4F0FF

border

#CECBD7

text

#0F0D17

muted

#7F7D85

Preview Lab

Preview with #6366F3

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

Preview Lab → · Contrast checker → · Palette generator →