#666FF1#666FF1

#666FF1 is a mid, vivid blue. Relative luminance 0.205; OKLCH L 60.3% C 0.192 H 276.0°. Best body text is #000000 at 5.11:1 contrast (WCAG AA passes).

Color values

HEX	#666FF1
RGB	rgb(102, 111, 241)
HSL	hsl(236, 83%, 67%)
HSV	hsv(236, 58%, 95%)
CMYK	cmyk(57.7%, 53.9%, 0%, 5.5%)
CIE-LAB	lab(52.45, 33.81, -66.68)
CIE-LCH	lch(52.45, 74.76, 296.89°)
OKLab	oklab(60.34% 0.0202 -0.1911)
OKLCH	oklch(60.34% 0.192 276)
XYZ	xyz(27.0360, 20.5425, 85.7424)
Luminance	0.2054 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FF1 #F1E866

analogous

#66B5F1 #666FF1 #A266F1

triadic

#666FF1 #F1666F #6FF166

tetradic

#666FF1 #F166B5 #F1E866 #66F1A2

square

#666FF1 #F166B5 #F1E866 #66F1A2

split-complementary

#666FF1 #F1A266 #B5F166

monochromatic

#121ECA #2E3AEC #666FF1 #9EA4F6 #D6D9FB

Accessibility & contrast

On white

4.11

#666FF1 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.11

#666FF1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FF1

5.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FF1	#FFFFFF	#000000	##000000
##666FF1	1.00	4.11	5.11	5.11
#FFFFFF	4.11	1.00	21.00	21.00
#000000	5.11	21.00	1.00	1.00
##000000	5.11	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#1583F5

Deuteranopia (green-blind)

#0077EE

Tritanopia (blue-blind)

#008DA5

Achromatopsia (no color)

#7D7D7D

Design tokens & code

CSS

--color: #666ff1;
/* rgb */ color: rgb(102, 111, 241);
/* oklch */ color: oklch(60.3% 0.192 276.0);

Tailwind

colors: {
  custom: {
    50: '#9d98f6',
    500: '#666ff1',
    950: '#000000',
  },
}

SCSS

$custom: #666ff1;
$custom-light: #9d98f6;
$custom-dark: #000000;

JSON

{
  "hex": "#666ff1",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 241
  },
  "hsl": {
    "h": 236.115,
    "s": 83.234,
    "l": 67.255
  },
  "oklch": {
    "l": 0.60335,
    "c": 0.1922,
    "h": 276
  },
  "luminance": 0.20545
}

Semantic roles & 50–950 ramp

primary

#666FF1

secondary

#EFECC3

accent

#D206E0

background

#FAF9FF

surface

#F4F2FF

border

#CECCD7

text

#0F0D17

muted

#7F7E85

Preview Lab

Preview with #666FF1

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

Preview Lab → · Contrast checker → · Palette generator →