#666ECF#666ECF

#666ECF is a mid, vivid blue. Relative luminance 0.185; OKLCH L 57.9% C 0.147 H 277.2°. Best body text is #000000 at 4.70:1 contrast (WCAG AA passes).

Color values

HEX	#666ECF
RGB	rgb(102, 110, 207)
HSL	hsl(235, 52%, 61%)
HSV	hsv(235, 51%, 81%)
CMYK	cmyk(50.7%, 46.9%, 0%, 18.8%)
CIE-LAB	lab(50.07, 23.65, -51.32)
CIE-LCH	lch(50.07, 56.51, 294.74°)
OKLab	oklab(57.87% 0.0185 -0.146)
OKLCH	oklch(57.87% 0.147 277.2)
XYZ	xyz(22.3144, 18.4803, 61.4106)
Luminance	0.1848 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666ECF #CFC766

analogous

#66A2CF #666ECF #9366CF

triadic

#666ECF #CF666E #6ECF66

tetradic

#666ECF #CF66A2 #CFC766 #66CF93

square

#666ECF #CF66A2 #CFC766 #66CF93

split-complementary

#666ECF #CF9366 #A2CF66

monochromatic

#2D348E #3B45BD #666ECF #959ADE #C3C6EC

Accessibility & contrast

On white

4.47

#666ECF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.70

#666ECF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666ECF

4.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666ECF	#FFFFFF	#000000	##000000
##666ECF	1.00	4.47	4.70	4.70
#FFFFFF	4.47	1.00	21.00	21.00
#000000	4.70	21.00	1.00	1.00
##000000	4.70	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#437BD3

Deuteranopia (green-blind)

#3973CD

Tritanopia (blue-blind)

#3B8394

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #666ecf;
/* rgb */ color: rgb(102, 110, 207);
/* oklch */ color: oklch(57.9% 0.147 277.2);

Tailwind

colors: {
  custom: {
    50: '#9897de',
    500: '#666ecf',
    950: '#000000',
  },
}

SCSS

$custom: #666ecf;
$custom-light: #9897de;
$custom-dark: #000000;

JSON

{
  "hex": "#666ecf",
  "rgb": {
    "r": 102,
    "g": 110,
    "b": 207
  },
  "hsl": {
    "h": 235.429,
    "s": 52.239,
    "l": 60.588
  },
  "oklch": {
    "l": 0.5787,
    "c": 0.14715,
    "h": 277.2
  },
  "luminance": 0.18482
}

Semantic roles & 50–950 ramp

primary

#666ECF

secondary

#DCD9B4

accent

#B426C0

background

#F9F9FD

surface

#F2F2FB

border

#CCCCD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666ECF

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

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