#666CEF#666CEF

#666CEF is a mid, vivid blue. Relative luminance 0.198; OKLCH L 59.7% C 0.193 H 276.8°. Best body text is #000000 at 4.96:1 contrast (WCAG AA passes).

Color values

HEX	#666CEF
RGB	rgb(102, 108, 239)
HSL	hsl(237, 81%, 67%)
HSV	hsv(237, 57%, 94%)
CMYK	cmyk(57.3%, 54.8%, 0%, 6.3%)
CIE-LAB	lab(51.59, 34.98, -66.95)
CIE-LCH	lch(51.59, 75.54, 297.58°)
OKLab	oklab(59.65% 0.023 -0.192)
OKLCH	oklch(59.65% 0.193 276.8)
XYZ	xyz(26.4170, 19.7800, 84.0705)
Luminance	0.1978 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CEF #EFE966

analogous

#66B1EF #666CEF #A566EF

triadic

#666CEF #EF666C #6CEF66

tetradic

#666CEF #EF66B1 #EFE966 #66EFA5

square

#666CEF #EF66B1 #EFE966 #66EFA5

split-complementary

#666CEF #EFA566 #B1EF66

monochromatic

#151CC6 #2F37E9 #666CEF #9DA1F5 #D5D6FB

Accessibility & contrast

On white

4.24

#666CEF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.96

#666CEF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666CEF

4.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CEF	#FFFFFF	#000000	##000000
##666CEF	1.00	4.24	4.96	4.96
#FFFFFF	4.24	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)

#0481F3

Deuteranopia (green-blind)

#0075EC

Tritanopia (blue-blind)

#038BA3

Achromatopsia (no color)

#7B7B7B

Design tokens & code

CSS

--color: #666cef;
/* rgb */ color: rgb(102, 108, 239);
/* oklch */ color: oklch(59.7% 0.193 276.8);

Tailwind

colors: {
  custom: {
    50: '#9d96f5',
    500: '#666cef',
    950: '#000000',
  },
}

SCSS

$custom: #666cef;
$custom-light: #9d96f5;
$custom-dark: #000000;

JSON

{
  "hex": "#666cef",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 239
  },
  "hsl": {
    "h": 237.372,
    "s": 81.065,
    "l": 66.863
  },
  "oklch": {
    "l": 0.59652,
    "c": 0.19333,
    "h": 276.8
  },
  "luminance": 0.19782
}

Semantic roles & 50–950 ramp

primary

#666CEF

secondary

#EEECC2

accent

#D408DD

background

#FAF9FF

surface

#F4F2FE

border

#CECCD6

text

#0F0D17

muted

#7F7E85

Preview Lab

Preview with #666CEF

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

Preview Lab → · Contrast checker → · Palette generator →