Astronomy
Rainbow Indigo
Rainbow Indigo
#6666FFClick to copy
Rainbow Indigo Parameter Conversion Table
More converters →HEX#6666FFCopy
RGBrgb(102, 102, 255)Copy
HSLhsl(240, 100%, 70%)Copy
HSV/HSBhsv(240, 60%, 100%)Copy
CMYKcmyk(60%, 60%, 0%, 0%)Copy
Rainbow Indigo Color Schemes
Complementary
#6666FF
Click to copy#FFFF66
Click to copyAnalogous
#66B3FF
Click to copy#B366FF
Click to copySplit Complementary
#FFB366
Click to copy#B3FF66
Click to copyMonochromatic
#6666FF
Click to copy#D0D0FB
Click to copy#FFFFFF
Click to copy#0000FF
Click to copy#000099
Click to copy#000033
Click to copyRainbow Indigo 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
4.28 : 1
AA NormalAA LargeAAA NormalAAA Large
Sample text Aa
Black background #000000
4.91 : 1
AA NormalAA LargeAAA NormalAAA Large
Sample text Aa
Light gray background #F5F5F5
3.92 : 1
AA NormalAA LargeAAA NormalAAA Large
Sample text Aa
Dark gray background #333333
2.95 : 1
AA NormalAA LargeAAA NormalAAA Large
Rainbow Indigo 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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Rainbow Indigo Color Introduction
Definition
Rainbow Indigo (HEX #6666FF) has the RGB value rgb(102, 102, 255), the HSL value hsl(240°, 100%, 70%) and the CMYK print value cmyk(60%, 60%, 0%, 0%). In terms of color schemes, the complement of Rainbow Indigo is #FFFF66, and placing the two side by side produces a striking, eye-catching contrast; paired with the analogous colors #66B2FF and #B266FF that sit next to it on the color wheel, it transitions naturally and harmoniously; in a split-complementary scheme (#FFB266, #B3FF66) it keeps its contrast tension without losing layering; and a monochromatic scheme built on Rainbow Indigo uses gradients of lightness and saturation to create a unified design with a strong sense of depth. Under the WCAG accessibility standard, Rainbow Indigo has a contrast ratio of 4.28:1 against white and 4.91:1 against black; paired with a black background it reaches AA, making it suitable for text in dark mode.
Color Characteristics
Blue is the color of sky and ocean, evoking vastness, trust and reason. Steady and imposing, it is almost irreplaceable in technology, finance and corporate identity design. Specifically, Rainbow Indigo has a lightness of 70% and a saturation of 100%, bright and airy, ideal as a light background or accent color that creates a soft, comfortable atmosphere; moreover, its saturation is extremely high and its visual tension is strong, so it works best used sparingly as a focal accent. In a word: The indigo of a rainbow, between blue and violet, profound and elegant.
Color Psychology
Blue can evoke calm, focus and trust, with a marked stabilizing effect; psychologically it symbolizes reason, loyalty and depth. For this reason Rainbow Indigo tends to leave a first impression of being cool and reliable in the viewer’s mind, and this emotional tone also defines the role it plays in design.
Best Uses
Blue suits fintech, corporate websites, government systems and any scene that needs professional trust. In real projects, Rainbow Indigo is also often used as a light background or supporting negative space; in “Blue”-themed designs, the adjacent colors or lightness gradients built around it quickly establish a cohesive, clearly layered color scheme.
Rainbow Indigo 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.
