#666FE9#666FE9

#666FE9 is a mid, vivid blue. Relative luminance 0.201; OKLCH L 59.8% C 0.182 H 276.2°. Best body text is #000000 at 5.02:1 contrast (WCAG AA passes).

Color values

HEX	#666FE9
RGB	rgb(102, 111, 233)
HSL	hsl(236, 75%, 66%)
HSV	hsv(236, 56%, 91%)
CMYK	cmyk(56.2%, 52.4%, 0%, 8.6%)
CIE-LAB	lab(51.92, 31.25, -63.05)
CIE-LCH	lch(51.92, 70.37, 296.37°)
OKLab	oklab(59.78% 0.0198 -0.1805)
OKLCH	oklch(59.78% 0.182 276.2)
XYZ	xyz(25.8672, 20.0750, 79.5868)
Luminance	0.2008 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FE9 #E9E066

analogous

#66B0E9 #666FE9 #9E66E9

triadic

#666FE9 #E9666F #6FE966

tetradic

#666FE9 #E966B0 #E9E066 #66E99E

square

#666FE9 #E966B0 #E9E066 #66E99E

split-complementary

#666FE9 #E99E66 #B0E966

monochromatic

#1B26BA #303DE1 #666FE9 #9CA1F1 #D1D4F8

Accessibility & contrast

On white

4.19

#666FE9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.02

#666FE9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FE9

5.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FE9	#FFFFFF	#000000	##000000
##666FE9	1.00	4.19	5.02	5.02
#FFFFFF	4.19	1.00	21.00	21.00
#000000	5.02	21.00	1.00	1.00
##000000	5.02	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#2781ED

Deuteranopia (green-blind)

#0076E6

Tritanopia (blue-blind)

#188BA1

Achromatopsia (no color)

#7C7C7C

Design tokens & code

CSS

--color: #666fe9;
/* rgb */ color: rgb(102, 111, 233);
/* oklch */ color: oklch(59.8% 0.182 276.2);

Tailwind

colors: {
  custom: {
    50: '#9c98f1',
    500: '#666fe9',
    950: '#000000',
  },
}

SCSS

$custom: #666fe9;
$custom-light: #9c98f1;
$custom-dark: #000000;

JSON

{
  "hex": "#666fe9",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 233
  },
  "hsl": {
    "h": 235.878,
    "s": 74.857,
    "l": 65.686
  },
  "oklch": {
    "l": 0.59776,
    "c": 0.18154,
    "h": 276.2
  },
  "luminance": 0.20077
}

Semantic roles & 50–950 ramp

primary

#666FE9

secondary

#EBE8C0

accent

#C90ED7

background

#FAF9FE

surface

#F4F2FD

border

#CECCD5

text

#0F0D17

muted

#7F7E85

Preview Lab

Preview with #666FE9

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

Preview Lab → · Contrast checker → · Palette generator →