#666CF0#666CF0

#666CF0 is a mid, vivid blue. Relative luminance 0.198; OKLCH L 59.7% C 0.195 H 276.8°. Best body text is #000000 at 4.97:1 contrast (WCAG AA passes).

Color values

HEX	#666CF0
RGB	rgb(102, 108, 240)
HSL	hsl(237, 82%, 67%)
HSV	hsv(237, 58%, 94%)
CMYK	cmyk(57.5%, 55%, 0%, 5.9%)
CIE-LAB	lab(51.65, 35.29, -67.40)
CIE-LCH	lch(51.65, 76.08, 297.64°)
OKLab	oklab(59.72% 0.023 -0.1933)
OKLCH	oklch(59.72% 0.195 276.8)
XYZ	xyz(26.5652, 19.8392, 84.8507)
Luminance	0.1984 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CF0 #F0EA66

analogous

#66B1F0 #666CF0 #A566F0

triadic

#666CF0 #F0666C #6CF066

tetradic

#666CF0 #F066B1 #F0EA66 #66F0A5

square

#666CF0 #F066B1 #F0EA66 #66F0A5

split-complementary

#666CF0 #F0A566 #B1F066

monochromatic

#141BC8 #2E36EB #666CF0 #9EA2F5 #D5D7FB

Accessibility & contrast

On white

4.23

#666CF0 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.97

#666CF0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666CF0

4.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CF0	#FFFFFF	#000000	##000000
##666CF0	1.00	4.23	4.97	4.97
#FFFFFF	4.23	1.00	21.00	21.00
#000000	4.97	21.00	1.00	1.00
##000000	4.97	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#0081F5

Deuteranopia (green-blind)

#0075ED

Tritanopia (blue-blind)

#008BA4

Achromatopsia (no color)

#7B7B7B

Design tokens & code

CSS

--color: #666cf0;
/* rgb */ color: rgb(102, 108, 240);
/* oklch */ color: oklch(59.7% 0.195 276.8);

Tailwind

colors: {
  custom: {
    50: '#9d96f6',
    500: '#666cf0',
    950: '#000000',
  },
}

SCSS

$custom: #666cf0;
$custom-light: #9d96f6;
$custom-dark: #000000;

JSON

{
  "hex": "#666cf0",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 240
  },
  "hsl": {
    "h": 237.391,
    "s": 82.143,
    "l": 67.059
  },
  "oklch": {
    "l": 0.59724,
    "c": 0.19465,
    "h": 276.8
  },
  "luminance": 0.19841
}

Semantic roles & 50–950 ramp

primary

#666CF0

secondary

#EFEDC3

accent

#D507DF

background

#FAF9FF

surface

#F4F2FF

border

#CECCD7

text

#0F0D17

muted

#7F7E85

Preview Lab

Preview with #666CF0

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

Preview Lab → · Contrast checker → · Palette generator →