#666BCF#666BCF

#666BCF is a mid, vivid blue. Relative luminance 0.178; OKLCH L 57.3% C 0.151 H 278.3°. Best body text is #FFFFFF at 4.60:1 contrast (WCAG AA passes).

Color values

HEX	#666BCF
RGB	rgb(102, 107, 207)
HSL	hsl(237, 52%, 61%)
HSV	hsv(237, 51%, 81%)
CMYK	cmyk(50.7%, 48.3%, 0%, 18.8%)
CIE-LAB	lab(49.31, 25.49, -52.55)
CIE-LCH	lch(49.31, 58.41, 295.87°)
OKLab	oklab(57.29% 0.0219 -0.1496)
OKLCH	oklch(57.29% 0.151 278.3)
XYZ	xyz(21.9962, 17.8439, 61.3045)
Luminance	0.1784 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BCF #CFCA66

analogous

#669FCF #666BCF #9566CF

triadic

#666BCF #CF666B #6BCF66

tetradic

#666BCF #CF669F #CFCA66 #66CF95

square

#666BCF #CF669F #CFCA66 #66CF95

split-complementary

#666BCF #CF9566 #9FCF66

monochromatic

#2D318E #3B41BD #666BCF #9598DE #C3C5EC

Accessibility & contrast

On white

4.60

#666BCF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.57

#666BCF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #666BCF

4.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BCF	#FFFFFF	#000000	##FFFFFF
##666BCF	1.00	4.60	4.57	4.60
#FFFFFF	4.60	1.00	21.00	1.00
#000000	4.57	21.00	1.00	21.00
##FFFFFF	4.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3D79D3

Deuteranopia (green-blind)

#3371CD

Tritanopia (blue-blind)

#3B8193

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #666bcf;
/* rgb */ color: rgb(102, 107, 207);
/* oklch */ color: oklch(57.3% 0.151 278.3);

Tailwind

colors: {
  custom: {
    50: '#9895de',
    500: '#666bcf',
    950: '#000000',
  },
}

SCSS

$custom: #666bcf;
$custom-light: #9895de;
$custom-dark: #000000;

JSON

{
  "hex": "#666bcf",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 207
  },
  "hsl": {
    "h": 237.143,
    "s": 52.239,
    "l": 60.588
  },
  "oklch": {
    "l": 0.57289,
    "c": 0.15121,
    "h": 278.3
  },
  "luminance": 0.17845
}

Semantic roles & 50–950 ramp

primary

#666BCF

secondary

#DCDAB4

accent

#B826C0

background

#F9F9FD

surface

#F2F1FB

border

#CCCBD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666BCF

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

Preview Lab → · Contrast checker → · Palette generator →