#666699 is a medium, grayish blue. The closest CSS named color is Slate Gray (#708090). In RGB it is rgb(102, 102, 153); in HSL, hsl(240, 20%, 50%).
| Hex | #666699 |
|---|---|
| RGB | rgb(102, 102, 153) |
| HSL | hsl(240, 20%, 50%) |
| CMYK | 33%, 33%, 0%, 40% |
| CSS example | color: #666699; background-color: rgb(102, 102, 153); |
The hue stepped through seven lightness levels, each matched to the closest named or web-safe color — useful for backgrounds, borders, text and hover states that all belong to one family. Click any swatch for its full breakdown.
Complementary — maximum contrast, from opposite sides of the color wheel:
Analogous — neighbours on the wheel, naturally harmonious:
Triadic — three colors evenly spaced for balanced variety:
Tetradic — four colors at 90° intervals:
On a #666699 background, white text gives the better contrast. WCAG requires 4.5:1 for normal text and 3:1 for large text (AA), or 7:1 and 4.5:1 for AAA.
| Text color | Contrast ratio | Normal text | Large text |
|---|---|---|---|
| White text (#ffffff) | 5.35:1 | AA | AAA |
| Black text (#000000) | 3.93:1 | Fails | AA |
The CSS named colors closest to #666699:
Turn #666699 into a full scheme with the Color Palette Generator, blend it into a background with the CSS Gradient Generator, or browse all named colors.