Tarte Flask is a cool silver with a metallic finish that is permanent and retails for $14.00. In comparison, Sydney Grace Shaley's Shimmer (Unbreakable Bond) is a cool gray with a metallic finish that is permanent in palette and retails for $6.25.
Sydney Grace Shaley's Shimmer (Unbreakable Bond) is 90% similar — it is less shimmery.