NARS Tropic is a cool teal with a sparkle finish that is permanent and retails for $19.00. In comparison, Natasha Denona Tropic (08V) is a cool teal with a satin finish that is permanent in palette and retails for $29.00.
Natasha Denona Tropic (08V) is 85% similar — it is more shimmery, more pigmented, cooler.