#666EE4#666EE4

#666EE4 is a mid, vivid blue. Relative luminance 0.196; OKLCH L 59.2% C 0.176 H 276.7°. Best body text is #000000 at 4.92:1 contrast (WCAG AA passes).

Color values

HEX	#666EE4
RGB	rgb(102, 110, 228)
HSL	hsl(236, 70%, 65%)
HSV	hsv(236, 55%, 89%)
CMYK	cmyk(55.3%, 51.8%, 0%, 10.6%)
CIE-LAB	lab(51.35, 30.27, -61.16)
CIE-LCH	lch(51.35, 68.24, 296.33°)
OKLab	oklab(59.25% 0.0205 -0.1749)
OKLCH	oklch(59.25% 0.176 276.7)
XYZ	xyz(25.0545, 19.5764, 75.8421)
Luminance	0.1958 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666EE4 #E4DC66

analogous

#66ADE4 #666EE4 #9D66E4

triadic

#666EE4 #E4666E #6EE466

tetradic

#666EE4 #E466AD #E4DC66 #66E49D

square

#666EE4 #E466AD #E4DC66 #66E49D

split-complementary

#666EE4 #E49D66 #ADE466

monochromatic

#1F28B0 #323DDB #666EE4 #9A9FED #CED1F6

Accessibility & contrast

On white

4.27

#666EE4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.92

#666EE4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666EE4

4.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666EE4	#FFFFFF	#000000	##000000
##666EE4	1.00	4.27	4.92	4.92
#FFFFFF	4.27	1.00	21.00	21.00
#000000	4.92	21.00	1.00	1.00
##000000	4.92	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#2C80E8

Deuteranopia (green-blind)

#1275E2

Tritanopia (blue-blind)

#22899E

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #666ee4;
/* rgb */ color: rgb(102, 110, 228);
/* oklch */ color: oklch(59.2% 0.176 276.7);

Tailwind

colors: {
  custom: {
    50: '#9b97ed',
    500: '#666ee4',
    950: '#000000',
  },
}

SCSS

$custom: #666ee4;
$custom-light: #9b97ed;
$custom-dark: #000000;

JSON

{
  "hex": "#666ee4",
  "rgb": {
    "r": 102,
    "g": 110,
    "b": 228
  },
  "hsl": {
    "h": 236.19,
    "s": 70,
    "l": 64.706
  },
  "oklch": {
    "l": 0.59248,
    "c": 0.17609,
    "h": 276.7
  },
  "luminance": 0.19578
}

Semantic roles & 50–950 ramp

primary

#666EE4

secondary

#E9E6BD

accent

#C614D2

background

#FAF9FE

surface

#F4F2FD

border

#CECCD5

text

#0F0D16

muted

#7F7E84

Preview Lab

Preview with #666EE4

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

Preview Lab → · Contrast checker → · Palette generator →