#6366D3#6366D3

#6366D3 is a mid, vivid blue. Relative luminance 0.169; OKLCH L 56.4% C 0.164 H 278.6°. Best body text is #FFFFFF at 4.80:1 contrast (WCAG AA passes).

Color values

HEX	#6366D3
RGB	rgb(99, 102, 211)
HSL	hsl(238, 56%, 61%)
HSV	hsv(238, 53%, 83%)
CMYK	cmyk(53.1%, 51.7%, 0%, 17.3%)
CIE-LAB	lab(48.08, 29.16, -56.81)
CIE-LCH	lch(48.08, 63.86, 297.17°)
OKLab	oklab(56.39% 0.0244 -0.1623)
OKLCH	oklch(56.39% 0.164 278.6)
XYZ	xyz(21.6511, 16.8572, 63.7283)
Luminance	0.1686 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#6366D3 #D3D063

analogous

#639ED3 #6366D3 #9863D3

triadic

#6366D3 #D36366 #66D363

tetradic

#6366D3 #D3639E #D3D063 #63D398

square

#6366D3 #D3639E #D3D063 #63D398

split-complementary

#6366D3 #D39863 #9ED363

monochromatic

#292C92 #373AC2 #6366D3 #9395E0 #C2C4EE

Accessibility & contrast

On white

4.80

#6366D3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.37

#6366D3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #6366D3

4.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##6366D3	#FFFFFF	#000000	##FFFFFF
##6366D3	1.00	4.80	4.37	4.80
#FFFFFF	4.80	1.00	21.00	1.00
#000000	4.37	21.00	1.00	21.00
##FFFFFF	4.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2C77D7

Deuteranopia (green-blind)

#1C6ED1

Tritanopia (blue-blind)

#307E93

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #6366d3;
/* rgb */ color: rgb(99, 102, 211);
/* oklch */ color: oklch(56.4% 0.164 278.6);

Tailwind

colors: {
  custom: {
    50: '#9791e1',
    500: '#6366d3',
    950: '#000000',
  },
}

SCSS

$custom: #6366d3;
$custom-light: #9791e1;
$custom-dark: #000000;

JSON

{
  "hex": "#6366d3",
  "rgb": {
    "r": 99,
    "g": 102,
    "b": 211
  },
  "hsl": {
    "h": 238.393,
    "s": 56,
    "l": 60.784
  },
  "oklch": {
    "l": 0.5639,
    "c": 0.1641,
    "h": 278.6
  },
  "luminance": 0.16859
}

Semantic roles & 50–950 ramp

primary

#6366D3

secondary

#DEDDB4

accent

#BF22C4

background

#F9F8FD

surface

#F2F0FB

border

#CCCBD4

text

#0E0C15

muted

#7E7D83

Preview Lab

Preview with #6366D3

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

Preview Lab → · Contrast checker → · Palette generator →