Givenchy It-Girl Purple is a cool pink with a satin finish that is permanent and retails for $44.00. In comparison, Estee Lauder Audacious Plum is a cool lavender with a satin finish that is permanent and retails for $34.00.
Estee Lauder Audacious Plum is 85% similar — it is more shimmery, darker, more muted.