#666EE9#666EE9

#666EE9 is a mid, vivid blue. Relative luminance 0.199; OKLCH L 59.6% C 0.183 H 276.5°. Best body text is #000000 at 4.97:1 contrast (WCAG AA passes).

Color values

HEX	#666EE9
RGB	rgb(102, 110, 233)
HSL	hsl(236, 75%, 66%)
HSV	hsv(236, 56%, 91%)
CMYK	cmyk(56.2%, 52.8%, 0%, 8.6%)
CIE-LAB	lab(51.68, 31.86, -63.45)
CIE-LCH	lch(51.68, 71.00, 296.66°)
OKLab	oklab(59.59% 0.0208 -0.1816)
OKLCH	oklch(59.59% 0.183 276.5)
XYZ	xyz(25.7587, 19.8580, 79.5506)
Luminance	0.1986 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666EE9 #E9E166

analogous

#66AFE9 #666EE9 #9F66E9

triadic

#666EE9 #E9666E #6EE966

tetradic

#666EE9 #E966AF #E9E166 #66E99F

square

#666EE9 #E966AF #E9E166 #66E99F

split-complementary

#666EE9 #E99F66 #AFE966

monochromatic

#1B24BA #303BE1 #666EE9 #9CA1F1 #D1D3F8

Accessibility & contrast

On white

4.22

#666EE9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.97

#666EE9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666EE9

4.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666EE9	#FFFFFF	#000000	##000000
##666EE9	1.00	4.22	4.97	4.97
#FFFFFF	4.22	1.00	21.00	21.00
#000000	4.97	21.00	1.00	1.00
##000000	4.97	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#2481ED

Deuteranopia (green-blind)

#0076E6

Tritanopia (blue-blind)

#188AA1

Achromatopsia (no color)

#7B7B7B

Design tokens & code

CSS

--color: #666ee9;
/* rgb */ color: rgb(102, 110, 233);
/* oklch */ color: oklch(59.6% 0.183 276.5);

Tailwind

colors: {
  custom: {
    50: '#9c97f1',
    500: '#666ee9',
    950: '#000000',
  },
}

SCSS

$custom: #666ee9;
$custom-light: #9c97f1;
$custom-dark: #000000;

JSON

{
  "hex": "#666ee9",
  "rgb": {
    "r": 102,
    "g": 110,
    "b": 233
  },
  "hsl": {
    "h": 236.336,
    "s": 74.857,
    "l": 65.686
  },
  "oklch": {
    "l": 0.59592,
    "c": 0.18282,
    "h": 276.5
  },
  "luminance": 0.1986
}

Semantic roles & 50–950 ramp

primary

#666EE9

secondary

#EBE9C0

accent

#CB0ED7

background

#FAF9FE

surface

#F4F2FD

border

#CECCD5

text

#0F0D17

muted

#7F7E85

Preview Lab

Preview with #666EE9

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

Preview Lab → · Contrast checker → · Palette generator →