#666EE3#666EE3

#666EE3 is a mid, vivid blue. Relative luminance 0.195; OKLCH L 59.2% C 0.175 H 276.7°. Best body text is #000000 at 4.90:1 contrast (WCAG AA passes).

Color values

HEX	#666EE3
RGB	rgb(102, 110, 227)
HSL	hsl(236, 69%, 65%)
HSV	hsv(236, 55%, 89%)
CMYK	cmyk(55.1%, 51.5%, 0%, 11%)
CIE-LAB	lab(51.29, 29.95, -60.70)
CIE-LCH	lch(51.29, 67.69, 296.26°)
OKLab	oklab(59.18% 0.0204 -0.1735)
OKLCH	oklch(59.18% 0.175 276.7)
XYZ	xyz(24.9161, 19.5210, 75.1131)
Luminance	0.1952 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666EE3 #E3DB66

analogous

#66ADE3 #666EE3 #9D66E3

triadic

#666EE3 #E3666E #6EE366

tetradic

#666EE3 #E366AD #E3DB66 #66E39D

square

#666EE3 #E366AD #E3DB66 #66E39D

split-complementary

#666EE3 #E39D66 #ADE366

monochromatic

#2029AF #323DDA #666EE3 #9A9FEC #CDD0F6

Accessibility & contrast

On white

4.28

#666EE3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.90

#666EE3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666EE3

4.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666EE3	#FFFFFF	#000000	##000000
##666EE3	1.00	4.28	4.90	4.90
#FFFFFF	4.28	1.00	21.00	21.00
#000000	4.90	21.00	1.00	1.00
##000000	4.90	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#2E7FE7

Deuteranopia (green-blind)

#1675E1

Tritanopia (blue-blind)

#24889E

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #666ee3;
/* rgb */ color: rgb(102, 110, 227);
/* oklch */ color: oklch(59.2% 0.175 276.7);

Tailwind

colors: {
  custom: {
    50: '#9b97ec',
    500: '#666ee3',
    950: '#000000',
  },
}

SCSS

$custom: #666ee3;
$custom-light: #9b97ec;
$custom-dark: #000000;

JSON

{
  "hex": "#666ee3",
  "rgb": {
    "r": 102,
    "g": 110,
    "b": 227
  },
  "hsl": {
    "h": 236.16,
    "s": 69.061,
    "l": 64.51
  },
  "oklch": {
    "l": 0.5918,
    "c": 0.17474,
    "h": 276.7
  },
  "luminance": 0.19523
}

Semantic roles & 50–950 ramp

primary

#666EE3

secondary

#E8E5BD

accent

#C514D1

background

#FAF9FE

surface

#F3F2FD

border

#CDCCD5

text

#0F0D16

muted

#7F7E84

Preview Lab

Preview with #666EE3

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

Preview Lab → · Contrast checker → · Palette generator →