Theory
Cool Dark Gray
Cool Dark Gray
#666666Click to copy
Cool Dark Gray Parameter Conversion Table
More converters →HEX#666666Copy
RGBrgb(102, 102, 102)Copy
HSLhsl(0, 0%, 40%)Copy
HSV/HSBhsv(0, 0%, 40%)Copy
CMYKcmyk(0%, 0%, 0%, 60%)Copy
Cool Dark Gray Color Schemes
Complementary
#666666
Click to copy#666666
Click to copyAnalogous
#666666
Click to copy#666666
Click to copySplit Complementary
#666666
Click to copy#666666
Click to copyMonochromatic
#666666
Click to copy#999999
Click to copy#CCCCCC
Click to copy#333333
Click to copy#000000
Click to copy#000000
Click to copyCool Dark Gray WCAG Accessibility Contrast
WCAG Calculator →The contrast ratio of this color against common foreground/background colors (based on the WCAG 2.1 standard)
Sample text Aa
White background #FFFFFF
5.74 : 1
AA NormalAA LargeAAA NormalAAA Large
Sample text Aa
Black background #000000
3.66 : 1
AA NormalAA LargeAAA NormalAAA Large
Sample text Aa
Light gray background #F5F5F5
5.27 : 1
AA NormalAA LargeAAA NormalAAA Large
Sample text Aa
Dark gray background #333333
2.20 : 1
AA NormalAA LargeAAA NormalAAA Large
Cool Dark Gray Shade Variants
Gradient Generator →Lighten with White Mixed with white for a lighter, softer color
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Darken with Black Mixed with black for a deeper, heavier color
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Muted / Morandi Mixed with gray and desaturated for a sophisticated muted tone
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Cool Dark Gray Color Introduction
Definition
Cool Dark Gray (HEX #666666) has the RGB value rgb(102, 102, 102), the HSL value hsl(0°, 0%, 40%) and the CMYK print value cmyk(0%, 0%, 0%, 60%). In terms of color schemes, the complement of Cool Dark Gray is #666666, and placing the two side by side produces a striking, eye-catching contrast; paired with the analogous colors #666666 and #666666 that sit next to it on the color wheel, it transitions naturally and harmoniously; in a split-complementary scheme (#666666, #666666) it keeps its contrast tension without losing layering; and a monochromatic scheme built on Cool Dark Gray uses gradients of lightness and saturation to create a unified design with a strong sense of depth. Under the WCAG accessibility standard, Cool Dark Gray has a contrast ratio of 5.74:1 against white and 3.66:1 against black; paired with a white background it reaches AA, giving body text good readability.
Color Characteristics
Gray offers an exceptionally rich range of lightness levels, from silver to charcoal, each with its own character; it is a core color in modern minimalist design and industrial style. Specifically, Cool Dark Gray has a lightness of 40% and a saturation of 0%, striking and generous as a background or primary color, offering good readability with either light or dark text; moreover, it contains almost no chromatic content, giving it a restrained, understated character that makes it ideal for creating a premium feel and a sense of space. In a word: A dark gray with a distinct cool feel and a reflective mood, a nightstand color for a dark-cool bedroom.
Color Psychology
Psychologically, gray stands for balance and restraint. Used well it creates a refined, calm atmosphere, but in large areas it can also feel dull and needs lightness variation to keep it lively. For this reason Cool Dark Gray tends to leave a first impression of being calm and restrained in the viewer’s mind, and this emotional tone also defines the role it plays in design.
Best Uses
Gray is commonly used for secondary text, dividers, disabled states and card backgrounds — an indispensable structural color for building interface hierarchy. In real projects, Cool Dark Gray is also often used as a dark background or heading text color; in “Gray”-themed designs, the adjacent colors or lightness gradients built around it quickly establish a cohesive, clearly layered color scheme.
Cool Dark Gray Featured In
This color is included in the following color cards and color families. Click a card to browse more colors in the corresponding collection.
