#666CF1#666CF1

#666CF1 is a mid, vivid blue. Relative luminance 0.199; OKLCH L 59.8% C 0.196 H 276.8°. Best body text is #000000 at 4.98:1 contrast (WCAG AA passes).

Color values

HEX	#666CF1
RGB	rgb(102, 108, 241)
HSL	hsl(237, 83%, 67%)
HSV	hsv(237, 58%, 95%)
CMYK	cmyk(57.7%, 55.2%, 0%, 5.5%)
CIE-LAB	lab(51.72, 35.61, -67.85)
CIE-LCH	lch(51.72, 76.63, 297.69°)
OKLab	oklab(59.8% 0.023 -0.1946)
OKLCH	oklch(59.8% 0.196 276.8)
XYZ	xyz(26.7141, 19.8988, 85.6352)
Luminance	0.1990 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CF1 #F1EB66

analogous

#66B2F1 #666CF1 #A666F1

triadic

#666CF1 #F1666C #6CF166

tetradic

#666CF1 #F166B2 #F1EB66 #66F1A6

square

#666CF1 #F166B2 #F1EB66 #66F1A6

split-complementary

#666CF1 #F1A666 #B2F166

monochromatic

#121ACA #2E36EC #666CF1 #9EA2F6 #D6D8FB

Accessibility & contrast

On white

4.22

#666CF1 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.98

#666CF1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666CF1

4.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CF1	#FFFFFF	#000000	##000000
##666CF1	1.00	4.22	4.98	4.98
#FFFFFF	4.22	1.00	21.00	21.00
#000000	4.98	21.00	1.00	1.00
##000000	4.98	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#0081F6

Deuteranopia (green-blind)

#0076EE

Tritanopia (blue-blind)

#008BA4

Achromatopsia (no color)

#7B7B7B

Design tokens & code

CSS

--color: #666cf1;
/* rgb */ color: rgb(102, 108, 241);
/* oklch */ color: oklch(59.8% 0.196 276.8);

Tailwind

colors: {
  custom: {
    50: '#9d96f6',
    500: '#666cf1',
    950: '#000000',
  },
}

SCSS

$custom: #666cf1;
$custom-light: #9d96f6;
$custom-dark: #000000;

JSON

{
  "hex": "#666cf1",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 241
  },
  "hsl": {
    "h": 237.41,
    "s": 83.234,
    "l": 67.255
  },
  "oklch": {
    "l": 0.59796,
    "c": 0.19596,
    "h": 276.8
  },
  "luminance": 0.19901
}

Semantic roles & 50–950 ramp

primary

#666CF1

secondary

#EFEDC3

accent

#D606E0

background

#FAF9FF

surface

#F4F2FF

border

#CECCD7

text

#0F0D17

muted

#7F7E85

Preview Lab

Preview with #666CF1

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

Preview Lab → · Contrast checker → · Palette generator →