ColourPop Winter Nites is a cool lavender with a pearl finish that is limited edition and retails for $10.00. In comparison, Melt Cosmetics Ultraviolet #1 is a cool purple with a frost finish that is limited edition and retails for $22.00.
Melt Cosmetics Ultraviolet #1 is 85% similar — it is more shimmery, darker, warmer.