#666FE5#666FE5

#666FE5 is a mid, vivid blue. Relative luminance 0.199; OKLCH L 59.5% C 0.176 H 276.4°. Best body text is #000000 at 4.97:1 contrast (WCAG AA passes).

Color values

HEX	#666FE5
RGB	rgb(102, 111, 229)
HSL	hsl(236, 71%, 65%)
HSV	hsv(236, 55%, 90%)
CMYK	cmyk(55.5%, 51.5%, 0%, 10.2%)
CIE-LAB	lab(51.67, 29.98, -61.22)
CIE-LCH	lch(51.67, 68.17, 296.09°)
OKLab	oklab(59.5% 0.0195 -0.1751)
OKLCH	oklch(59.5% 0.176 276.4)
XYZ	xyz(25.3023, 19.8491, 76.6115)
Luminance	0.1985 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FE5 #E5DC66

analogous

#66AFE5 #666FE5 #9D66E5

triadic

#666FE5 #E5666F #6FE566

tetradic

#666FE5 #E566AF #E5DC66 #66E59D

square

#666FE5 #E566AF #E5DC66 #66E59D

split-complementary

#666FE5 #E59D66 #AFE566

monochromatic

#1E29B2 #323EDC #666FE5 #9AA0EE #CFD1F7

Accessibility & contrast

On white

4.23

#666FE5 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.97

#666FE5 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FE5

4.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FE5	#FFFFFF	#000000	##000000
##666FE5	1.00	4.23	4.97	4.97
#FFFFFF	4.23	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)

#2E81E9

Deuteranopia (green-blind)

#1476E3

Tritanopia (blue-blind)

#208A9F

Achromatopsia (no color)

#7B7B7B

Design tokens & code

CSS

--color: #666fe5;
/* rgb */ color: rgb(102, 111, 229);
/* oklch */ color: oklch(59.5% 0.176 276.4);

Tailwind

colors: {
  custom: {
    50: '#9b98ee',
    500: '#666fe5',
    950: '#000000',
  },
}

SCSS

$custom: #666fe5;
$custom-light: #9b98ee;
$custom-dark: #000000;

JSON

{
  "hex": "#666fe5",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 229
  },
  "hsl": {
    "h": 235.748,
    "s": 70.95,
    "l": 64.902
  },
  "oklch": {
    "l": 0.59503,
    "c": 0.17615,
    "h": 276.4
  },
  "luminance": 0.19851
}

Semantic roles & 50–950 ramp

primary

#666FE5

secondary

#E9E6BE

accent

#C513D3

background

#FAF9FE

surface

#F4F2FD

border

#CECCD5

text

#0F0D16

muted

#7F7E84

Preview Lab

Preview with #666FE5

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

Preview Lab → · Contrast checker → · Palette generator →