#666CF3#666CF3

#666CF3 is a mid, vivid blue. Relative luminance 0.200; OKLCH L 59.9% C 0.199 H 276.7°. Best body text is #000000 at 5.00:1 contrast (WCAG AA passes).

Color values

HEX	#666CF3
RGB	rgb(102, 108, 243)
HSL	hsl(237, 85%, 68%)
HSV	hsv(237, 58%, 95%)
CMYK	cmyk(58%, 55.6%, 0%, 4.7%)
CIE-LAB	lab(51.86, 36.25, -68.74)
CIE-LCH	lch(51.86, 77.72, 297.80°)
OKLab	oklab(59.94% 0.0231 -0.1972)
OKLCH	oklch(59.94% 0.199 276.7)
XYZ	xyz(27.0145, 20.0190, 87.2171)
Luminance	0.2002 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CF3 #F3ED66

analogous

#66B2F3 #666CF3 #A766F3

triadic

#666CF3 #F3666C #6CF366

tetradic

#666CF3 #F366B2 #F3ED66 #66F3A7

square

#666CF3 #F366B2 #F3ED66 #66F3A7

split-complementary

#666CF3 #F3A766 #B2F366

monochromatic

#1018CE #2D35EF #666CF3 #9FA3F7 #D7D9FC

Accessibility & contrast

On white

4.20

#666CF3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.00

#666CF3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666CF3

5.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CF3	#FFFFFF	#000000	##000000
##666CF3	1.00	4.20	5.00	5.00
#FFFFFF	4.20	1.00	21.00	21.00
#000000	5.00	21.00	1.00	1.00
##000000	5.00	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#0082F8

Deuteranopia (green-blind)

#0076F0

Tritanopia (blue-blind)

#008CA5

Achromatopsia (no color)

#7C7C7C

Design tokens & code

CSS

--color: #666cf3;
/* rgb */ color: rgb(102, 108, 243);
/* oklch */ color: oklch(59.9% 0.199 276.7);

Tailwind

colors: {
  custom: {
    50: '#9d96f8',
    500: '#666cf3',
    950: '#000000',
  },
}

SCSS

$custom: #666cf3;
$custom-light: #9d96f8;
$custom-dark: #000000;

JSON

{
  "hex": "#666cf3",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 243
  },
  "hsl": {
    "h": 237.447,
    "s": 85.455,
    "l": 67.647
  },
  "oklch": {
    "l": 0.5994,
    "c": 0.19859,
    "h": 276.7
  },
  "luminance": 0.20021
}

Semantic roles & 50–950 ramp

primary

#666CF3

secondary

#F0EEC5

accent

#D804E2

background

#FAF9FF

surface

#F4F2FF

border

#CECCD7

text

#0F0D17

muted

#7F7E85

Preview Lab

Preview with #666CF3

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

Preview Lab → · Contrast checker → · Palette generator →