Essie Go Overboard Nail Lacquer ($8.00 for 0.50 fl. oz.) is described as “a limitless sea blue.” It’s a deep, almost inky, blue with subtle hints of teal–you might call it a very blue teal or a teal-tinged navy blue. MAC Deep Sea is greener and much, much darker. Rescue Beauty Lounge Teal is a bit darker and greener. Illamasqua Viridian is more of a teal. Nothing I could think of was close; everything that was even remotely similar was significantly darker.