#666BF1#666BF1

#666BF1 is a mid, vivid blue. Relative luminance 0.197; OKLCH L 59.6% C 0.197 H 277.0°. Best body text is #000000 at 4.94:1 contrast (WCAG AA passes).

Color values

HEX	#666BF1
RGB	rgb(102, 107, 241)
HSL	hsl(238, 83%, 67%)
HSV	hsv(238, 58%, 95%)
CMYK	cmyk(57.7%, 55.6%, 0%, 5.5%)
CIE-LAB	lab(51.48, 36.21, -68.24)
CIE-LCH	lch(51.48, 77.25, 297.95°)
OKLab	oklab(59.62% 0.024 -0.1957)
OKLCH	oklch(59.62% 0.197 277)
XYZ	xyz(26.6093, 19.6891, 85.6002)
Luminance	0.1969 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BF1 #F1EC66

analogous

#66B0F1 #666BF1 #A766F1

triadic

#666BF1 #F1666B #6BF166

tetradic

#666BF1 #F166B0 #F1EC66 #66F1A7

square

#666BF1 #F166B0 #F1EC66 #66F1A7

split-complementary

#666BF1 #F1A766 #B0F166

monochromatic

#1219CA #2E35EC #666BF1 #9EA1F6 #D6D7FB

Accessibility & contrast

On white

4.25

#666BF1 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.94

#666BF1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666BF1

4.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BF1	#FFFFFF	#000000	##000000
##666BF1	1.00	4.25	4.94	4.94
#FFFFFF	4.25	1.00	21.00	21.00
#000000	4.94	21.00	1.00	1.00
##000000	4.94	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#0081F6

Deuteranopia (green-blind)

#0075EE

Tritanopia (blue-blind)

#008BA4

Achromatopsia (no color)

#7B7B7B

Design tokens & code

CSS

--color: #666bf1;
/* rgb */ color: rgb(102, 107, 241);
/* oklch */ color: oklch(59.6% 0.197 277.0);

Tailwind

colors: {
  custom: {
    50: '#9d95f6',
    500: '#666bf1',
    950: '#000000',
  },
}

SCSS

$custom: #666bf1;
$custom-light: #9d95f6;
$custom-dark: #000000;

JSON

{
  "hex": "#666bf1",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 241
  },
  "hsl": {
    "h": 237.842,
    "s": 83.234,
    "l": 67.255
  },
  "oklch": {
    "l": 0.59618,
    "c": 0.19722,
    "h": 277
  },
  "luminance": 0.19691
}

Semantic roles & 50–950 ramp

primary

#666BF1

secondary

#EFEEC3

accent

#D806E0

background

#FAF9FF

surface

#F4F1FF

border

#CECBD7

text

#0F0D17

muted

#7F7E85

Preview Lab

Preview with #666BF1

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

Preview Lab → · Contrast checker → · Palette generator →