#666DE4#666DE4

#666DE4 is a mid, vivid blue. Relative luminance 0.194; OKLCH L 59.1% C 0.177 H 277.0°. Best body text is #000000 at 4.87:1 contrast (WCAG AA passes).

Color values

HEX	#666DE4
RGB	rgb(102, 109, 228)
HSL	hsl(237, 70%, 65%)
HSV	hsv(237, 55%, 89%)
CMYK	cmyk(55.3%, 52.2%, 0%, 10.6%)
CIE-LAB	lab(51.11, 30.88, -61.56)
CIE-LCH	lch(51.11, 68.87, 296.64°)
OKLab	oklab(59.06% 0.0215 -0.1761)
OKLCH	oklch(59.06% 0.177 277)
XYZ	xyz(24.9473, 19.3618, 75.8063)
Luminance	0.1936 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666DE4 #E4DD66

analogous

#66ACE4 #666DE4 #9E66E4

triadic

#666DE4 #E4666D #6DE466

tetradic

#666DE4 #E466AC #E4DD66 #66E49E

square

#666DE4 #E466AC #E4DD66 #66E49E

split-complementary

#666DE4 #E49E66 #ACE466

monochromatic

#1F27B0 #323BDB #666DE4 #9A9FED #CED0F6

Accessibility & contrast

On white

4.31

#666DE4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.87

#666DE4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666DE4

4.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666DE4	#FFFFFF	#000000	##000000
##666DE4	1.00	4.31	4.87	4.87
#FFFFFF	4.31	1.00	21.00	21.00
#000000	4.87	21.00	1.00	1.00
##000000	4.87	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#297FE8

Deuteranopia (green-blind)

#0C75E1

Tritanopia (blue-blind)

#22889E

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #666de4;
/* rgb */ color: rgb(102, 109, 228);
/* oklch */ color: oklch(59.1% 0.177 277.0);

Tailwind

colors: {
  custom: {
    50: '#9b96ed',
    500: '#666de4',
    950: '#000000',
  },
}

SCSS

$custom: #666de4;
$custom-light: #9b96ed;
$custom-dark: #000000;

JSON

{
  "hex": "#666de4",
  "rgb": {
    "r": 102,
    "g": 109,
    "b": 228
  },
  "hsl": {
    "h": 236.667,
    "s": 70,
    "l": 64.706
  },
  "oklch": {
    "l": 0.59063,
    "c": 0.17739,
    "h": 277
  },
  "luminance": 0.19363
}

Semantic roles & 50–950 ramp

primary

#666DE4

secondary

#E9E6BD

accent

#C714D2

background

#FAF9FE

surface

#F4F2FD

border

#CECCD5

text

#0F0D16

muted

#7F7E84

Preview Lab

Preview with #666DE4

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

Preview Lab → · Contrast checker → · Palette generator →