MAC Aqua is a cool aqua with a matte finish that is limited edition and retails for $17.00. In comparison, ColourPop Vibez (Aura and Out) is a cool aqua with a semi-matte finish that is limited edition and retails for $4.50.
ColourPop Vibez (Aura and Out) is 90% similar — it is more shimmery, darker, warmer.