#666BD9#666BD9

#666BD9 is a mid, vivid blue. Relative luminance 0.183; OKLCH L 57.9% C 0.165 H 278.0°. Best body text is #000000 at 4.67:1 contrast (WCAG AA passes).

Color values

HEX	#666BD9
RGB	rgb(102, 107, 217)
HSL	hsl(237, 60%, 63%)
HSV	hsv(237, 53%, 85%)
CMYK	cmyk(53%, 50.7%, 0%, 14.9%)
CIE-LAB	lab(49.92, 28.62, -57.26)
CIE-LCH	lch(49.92, 64.01, 296.55°)
OKLab	oklab(57.95% 0.0229 -0.1635)
OKLCH	oklch(57.95% 0.165 278)
XYZ	xyz(23.2576, 18.3485, 67.9483)
Luminance	0.1835 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BD9 #D9D466

analogous

#66A5D9 #666BD9 #9A66D9

triadic

#666BD9 #D9666B #6BD966

tetradic

#666BD9 #D966A5 #D9D466 #66D99A

square

#666BD9 #D966A5 #D9D466 #66D99A

split-complementary

#666BD9 #D99A66 #A5D966

monochromatic

#272C9D #353CCD #666BD9 #979AE5 #C8CAF1

Accessibility & contrast

On white

4.50

#666BD9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.67

#666BD9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666BD9

4.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BD9	#FFFFFF	#000000	##000000
##666BD9	1.00	4.50	4.67	4.67
#FFFFFF	4.50	1.00	21.00	21.00
#000000	4.67	21.00	1.00	1.00
##000000	4.67	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#337BDD

Deuteranopia (green-blind)

#2372D7

Tritanopia (blue-blind)

#328498

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #666bd9;
/* rgb */ color: rgb(102, 107, 217);
/* oklch */ color: oklch(57.9% 0.165 278.0);

Tailwind

colors: {
  custom: {
    50: '#9a95e5',
    500: '#666bd9',
    950: '#000000',
  },
}

SCSS

$custom: #666bd9;
$custom-light: #9a95e5;
$custom-dark: #000000;

JSON

{
  "hex": "#666bd9",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 217
  },
  "hsl": {
    "h": 237.391,
    "s": 60.209,
    "l": 62.549
  },
  "oklch": {
    "l": 0.57945,
    "c": 0.16506,
    "h": 278
  },
  "luminance": 0.1835
}

Semantic roles & 50–950 ramp

primary

#666BD9

secondary

#E2E0B8

accent

#C01EC8

background

#F9F9FE

surface

#F2F1FC

border

#CCCBD5

text

#0F0D16

muted

#7E7E84

Preview Lab

Preview with #666BD9

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

Preview Lab → · Contrast checker → · Palette generator →