Here are the bottles:
And here they are on my nails (top to bottom): Julep Alice (pointer; 2 coats), Zoya Julie (middle; 3 thick coats), Butter London Molly-Coddled (ring; 2 coats), and Square Hue Groovy Love (pinkie; 2 coats).
And in that order with their respective bottles:
|Butter London Molly-Coddled|
|Square Hue Groovy Love|
About color: They are all definitely different. The most creamy purple was the Square Hue- and it was also the darkest. The Butter London was almost pink- it definitely stood out as the least purple when on my nails. The Zoya was the most shimmery. The Julep only appears shimmery in the right light, but the Zoya is constantly shimmery, and as a result looks like a lighter color, though they are definitely the closest- the difference in color is really due to the amount of silver shimmer in it.
Application: The Julep was the most one-coater/thick (but still easy to apply)- the second coat did nothing but make it thicker on the nail. The Square Hue was next- it almost didn't need two coats, but looked a little better with the second. The Butter London needed two coats, but coverage was good with the second coat. The Zoya was definitely the thinnest. I did 3 THICK coats, and I still have a bit of a visible nail line in the right light.
Hope this helps! I am loving purple this spring, and I hope you do too!