#666FE4#666FE4

#666FE4 is a mid, vivid blue. Relative luminance 0.198; OKLCH L 59.4% C 0.175 H 276.4°. Best body text is #000000 at 4.96:1 contrast (WCAG AA passes).

Color values

HEX	#666FE4
RGB	rgb(102, 111, 228)
HSL	hsl(236, 70%, 65%)
HSV	hsv(236, 55%, 89%)
CMYK	cmyk(55.3%, 51.3%, 0%, 10.6%)
CIE-LAB	lab(51.60, 29.66, -60.76)
CIE-LCH	lch(51.60, 67.61, 296.02°)
OKLab	oklab(59.44% 0.0194 -0.1737)
OKLCH	oklch(59.44% 0.175 276.4)
XYZ	xyz(25.1630, 19.7934, 75.8783)
Luminance	0.1979 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FE4 #E4DB66

analogous

#66AEE4 #666FE4 #9C66E4

triadic

#666FE4 #E4666F #6FE466

tetradic

#666FE4 #E466AE #E4DB66 #66E49C

square

#666FE4 #E466AE #E4DB66 #66E49C

split-complementary

#666FE4 #E49C66 #AEE466

monochromatic

#1F2AB0 #323EDB #666FE4 #9AA0ED #CED1F6

Accessibility & contrast

On white

4.23

#666FE4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.96

#666FE4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FE4

4.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FE4	#FFFFFF	#000000	##000000
##666FE4	1.00	4.23	4.96	4.96
#FFFFFF	4.23	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)

#2F80E8

Deuteranopia (green-blind)

#1776E2

Tritanopia (blue-blind)

#22899F

Achromatopsia (no color)

#7B7B7B

Design tokens & code

CSS

--color: #666fe4;
/* rgb */ color: rgb(102, 111, 228);
/* oklch */ color: oklch(59.4% 0.175 276.4);

Tailwind

colors: {
  custom: {
    50: '#9b98ed',
    500: '#666fe4',
    950: '#000000',
  },
}

SCSS

$custom: #666fe4;
$custom-light: #9b98ed;
$custom-dark: #000000;

JSON

{
  "hex": "#666fe4",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 228
  },
  "hsl": {
    "h": 235.714,
    "s": 70,
    "l": 64.706
  },
  "oklch": {
    "l": 0.59435,
    "c": 0.1748,
    "h": 276.4
  },
  "luminance": 0.19795
}

Semantic roles & 50–950 ramp

primary

#666FE4

secondary

#E9E5BD

accent

#C414D2

background

#FAF9FE

surface

#F3F2FD

border

#CDCCD5

text

#0F0D16

muted

#7F7E84

Preview Lab

Preview with #666FE4

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

Preview Lab → · Contrast checker → · Palette generator →