#666BF3#666BF3

#666BF3 is a mid, vivid blue. Relative luminance 0.198; OKLCH L 59.8% C 0.200 H 276.9°. Best body text is #000000 at 4.96:1 contrast (WCAG AA passes).

Color values

HEX	#666BF3
RGB	rgb(102, 107, 243)
HSL	hsl(238, 85%, 68%)
HSV	hsv(238, 58%, 95%)
CMYK	cmyk(58%, 56%, 0%, 4.7%)
CIE-LAB	lab(51.62, 36.85, -69.13)
CIE-LCH	lch(51.62, 78.34, 298.06°)
OKLab	oklab(59.76% 0.024 -0.1984)
OKLCH	oklch(59.76% 0.2 276.9)
XYZ	xyz(26.9096, 19.8093, 87.1822)
Luminance	0.1981 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BF3 #F3EE66

analogous

#66B2F3 #666BF3 #A766F3

triadic

#666BF3 #F3666B #6BF366

tetradic

#666BF3 #F366B2 #F3EE66 #66F3A7

square

#666BF3 #F366B2 #F3EE66 #66F3A7

split-complementary

#666BF3 #F3A766 #B2F366

monochromatic

#1017CE #2D34EF #666BF3 #9FA2F7 #D7D9FC

Accessibility & contrast

On white

4.23

#666BF3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.96

#666BF3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666BF3

4.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BF3	#FFFFFF	#000000	##000000
##666BF3	1.00	4.23	4.96	4.96
#FFFFFF	4.23	1.00	21.00	21.00
#000000	4.96	21.00	1.00	1.00
##000000	4.96	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#0081F8

Deuteranopia (green-blind)

#0075F0

Tritanopia (blue-blind)

#008BA5

Achromatopsia (no color)

#7B7B7B

Design tokens & code

CSS

--color: #666bf3;
/* rgb */ color: rgb(102, 107, 243);
/* oklch */ color: oklch(59.8% 0.200 276.9);

Tailwind

colors: {
  custom: {
    50: '#9d95f8',
    500: '#666bf3',
    950: '#000000',
  },
}

SCSS

$custom: #666bf3;
$custom-light: #9d95f8;
$custom-dark: #000000;

JSON

{
  "hex": "#666bf3",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 243
  },
  "hsl": {
    "h": 237.872,
    "s": 85.455,
    "l": 67.647
  },
  "oklch": {
    "l": 0.59763,
    "c": 0.19983,
    "h": 276.9
  },
  "luminance": 0.19811
}

Semantic roles & 50–950 ramp

primary

#666BF3

secondary

#F0EFC5

accent

#DA04E2

background

#FAF9FF

surface

#F4F1FF

border

#CECBD7

text

#0F0D17

muted

#7F7E85

Preview Lab

Preview with #666BF3

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

Preview Lab → · Contrast checker → · Palette generator →