#666FEF#666FEF

#666FEF is a mid, vivid blue. Relative luminance 0.204; OKLCH L 60.2% C 0.190 H 276.1°. Best body text is #000000 at 5.09:1 contrast (WCAG AA passes).

Color values

HEX	#666FEF
RGB	rgb(102, 111, 239)
HSL	hsl(236, 81%, 67%)
HSV	hsv(236, 57%, 94%)
CMYK	cmyk(57.3%, 53.6%, 0%, 6.3%)
CIE-LAB	lab(52.31, 33.17, -65.78)
CIE-LCH	lch(52.31, 73.67, 296.76°)
OKLab	oklab(60.19% 0.0201 -0.1885)
OKLCH	oklch(60.19% 0.19 276.1)
XYZ	xyz(26.7389, 20.4237, 84.1778)
Luminance	0.2043 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FEF #EFE666

analogous

#66B4EF #666FEF #A166EF

triadic

#666FEF #EF666F #6FEF66

tetradic

#666FEF #EF66B4 #EFE666 #66EFA1

square

#666FEF #EF66B4 #EFE666 #66EFA1

split-complementary

#666FEF #EFA166 #B4EF66

monochromatic

#1520C6 #2F3BE9 #666FEF #9DA3F5 #D5D7FB

Accessibility & contrast

On white

4.13

#666FEF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.09

#666FEF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FEF

5.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FEF	#FFFFFF	#000000	##000000
##666FEF	1.00	4.13	5.09	5.09
#FFFFFF	4.13	1.00	21.00	21.00
#000000	5.09	21.00	1.00	1.00
##000000	5.09	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#1B83F3

Deuteranopia (green-blind)

#0077EC

Tritanopia (blue-blind)

#018DA4

Achromatopsia (no color)

#7D7D7D

Design tokens & code

CSS

--color: #666fef;
/* rgb */ color: rgb(102, 111, 239);
/* oklch */ color: oklch(60.2% 0.190 276.1);

Tailwind

colors: {
  custom: {
    50: '#9d98f5',
    500: '#666fef',
    950: '#000000',
  },
}

SCSS

$custom: #666fef;
$custom-light: #9d98f5;
$custom-dark: #000000;

JSON

{
  "hex": "#666fef",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 239
  },
  "hsl": {
    "h": 236.058,
    "s": 81.065,
    "l": 66.863
  },
  "oklch": {
    "l": 0.60194,
    "c": 0.18955,
    "h": 276.1
  },
  "luminance": 0.20426
}

Semantic roles & 50–950 ramp

primary

#666FEF

secondary

#EEEBC2

accent

#CF08DD

background

#FAF9FF

surface

#F4F2FE

border

#CECCD6

text

#0F0D17

muted

#7F7E85

Preview Lab

Preview with #666FEF

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

Preview Lab → · Contrast checker → · Palette generator →