ColourPop Nix is a warm teal with a metallic finish that is limited edition and retails for $6.00. In comparison, Natasha Denona Cloudy Blue (17M) is a cool teal with a metallic finish that is permanent in palette and retails for $29.00.
Natasha Denona Cloudy Blue (17M) is 85% similar — it is more shimmery, darker, cooler.