#666FF5#666FF5

#666FF5 is a mid, vivid blue. Relative luminance 0.208; OKLCH L 60.6% C 0.197 H 275.9°. Best body text is #000000 at 5.16:1 contrast (WCAG AA passes).

Color values

HEX	#666FF5
RGB	rgb(102, 111, 245)
HSL	hsl(236, 88%, 68%)
HSV	hsv(236, 58%, 96%)
CMYK	cmyk(58.4%, 54.7%, 0%, 3.9%)
CIE-LAB	lab(52.71, 35.09, -68.48)
CIE-LCH	lch(52.71, 76.94, 297.13°)
OKLab	oklab(60.62% 0.0203 -0.1964)
OKLCH	oklch(60.62% 0.197 275.9)
XYZ	xyz(27.6400, 20.7842, 88.9237)
Luminance	0.2079 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FF5 #F5EC66

analogous

#66B6F5 #666FF5 #A466F5

triadic

#666FF5 #F5666F #6FF566

tetradic

#666FF5 #F566B6 #F5EC66 #66F5A4

square

#666FF5 #F566B6 #F5EC66 #66F5A4

split-complementary

#666FF5 #F5A466 #B6F566

monochromatic

#0E1AD3 #2D39F1 #666FF5 #9FA5F9 #D9DBFD

Accessibility & contrast

On white

4.07

#666FF5 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.16

#666FF5 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FF5

5.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FF5	#FFFFFF	#000000	##000000
##666FF5	1.00	4.07	5.16	5.16
#FFFFFF	4.07	1.00	21.00	21.00
#000000	5.16	21.00	1.00	1.00
##000000	5.16	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#0284FA

Deuteranopia (green-blind)

#0078F2

Tritanopia (blue-blind)

#008EA7

Achromatopsia (no color)

#7E7E7E

Design tokens & code

CSS

--color: #666ff5;
/* rgb */ color: rgb(102, 111, 245);
/* oklch */ color: oklch(60.6% 0.197 275.9);

Tailwind

colors: {
  custom: {
    50: '#9d98f9',
    500: '#666ff5',
    950: '#000000',
  },
}

SCSS

$custom: #666ff5;
$custom-light: #9d98f9;
$custom-dark: #000000;

JSON

{
  "hex": "#666ff5",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 245
  },
  "hsl": {
    "h": 236.224,
    "s": 87.73,
    "l": 68.039
  },
  "oklch": {
    "l": 0.6062,
    "c": 0.19747,
    "h": 275.9
  },
  "luminance": 0.20786
}

Semantic roles & 50–950 ramp

primary

#666FF5

secondary

#F1EFC6

accent

#D601E4

background

#FAF9FF

surface

#F4F2FF

border

#CECCD7

text

#100D17

muted

#7F7E85

Preview Lab

Preview with #666FF5

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

Preview Lab → · Contrast checker → · Palette generator →