#666FF4#666FF4

#666FF4 is a mid, vivid blue. Relative luminance 0.207; OKLCH L 60.5% C 0.196 H 275.9°. Best body text is #000000 at 5.15:1 contrast (WCAG AA passes).

Color values

HEX	#666FF4
RGB	rgb(102, 111, 244)
HSL	hsl(236, 87%, 68%)
HSV	hsv(236, 58%, 96%)
CMYK	cmyk(58.2%, 54.5%, 0%, 4.3%)
CIE-LAB	lab(52.65, 34.77, -68.03)
CIE-LCH	lch(52.65, 76.40, 297.07°)
OKLab	oklab(60.55% 0.0203 -0.1951)
OKLCH	oklch(60.55% 0.196 275.9)
XYZ	xyz(27.4878, 20.7233, 88.1219)
Luminance	0.2072 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FF4 #F4EB66

analogous

#66B6F4 #666FF4 #A466F4

triadic

#666FF4 #F4666F #6FF466

tetradic

#666FF4 #F466B6 #F4EB66 #66F4A4

square

#666FF4 #F466B6 #F4EB66 #66F4A4

split-complementary

#666FF4 #F4A466 #B6F466

monochromatic

#0F1BD1 #2D39F0 #666FF4 #9FA5F8 #D8DAFC

Accessibility & contrast

On white

4.08

#666FF4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.15

#666FF4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FF4

5.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FF4	#FFFFFF	#000000	##000000
##666FF4	1.00	4.08	5.15	5.15
#FFFFFF	4.08	1.00	21.00	21.00
#000000	5.15	21.00	1.00	1.00
##000000	5.15	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#0784F9

Deuteranopia (green-blind)

#0078F1

Tritanopia (blue-blind)

#008EA7

Achromatopsia (no color)

#7E7E7E

Design tokens & code

CSS

--color: #666ff4;
/* rgb */ color: rgb(102, 111, 244);
/* oklch */ color: oklch(60.5% 0.196 275.9);

Tailwind

colors: {
  custom: {
    50: '#9d98f9',
    500: '#666ff4',
    950: '#000000',
  },
}

SCSS

$custom: #666ff4;
$custom-light: #9d98f9;
$custom-dark: #000000;

JSON

{
  "hex": "#666ff4",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 244
  },
  "hsl": {
    "h": 236.197,
    "s": 86.585,
    "l": 67.843
  },
  "oklch": {
    "l": 0.60548,
    "c": 0.19615,
    "h": 275.9
  },
  "luminance": 0.20725
}

Semantic roles & 50–950 ramp

primary

#666FF4

secondary

#F1EEC5

accent

#D502E3

background

#FAF9FF

surface

#F4F2FF

border

#CECCD7

text

#0F0D17

muted

#7F7E85

Preview Lab

Preview with #666FF4

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

Preview Lab → · Contrast checker → · Palette generator →