Get the closest CSS color name for any hex, with the exact-match indicator.
It compares your color to the 140+ named CSS colors and returns the closest one by RGB distance. If your hex exactly matches a named color, it says so; otherwise it gives the nearest name plus that name's hex for comparison.
This tool goes from hex to the nearest name. The two swatches let you see how close the named color is to your exact value, which is what matters when deciding whether to use the keyword.
The standard CSS / X11 named colors that all browsers support, so any name it returns works directly in CSS.