Сouple hours ago I wrote a review about the Beam project. Grin is also a project that directs the main work to anonymity of users, transactions and other actions. By the way, this system also works on the open source MimbleWimble protocol. I really liked the project logo and the fact that no one knows the creator of the project. There is some dark, unknown in this and I feel like a real anonymous, haha. In my opinion, Grin outperforms Beam in transaction speed, but their design is very primitive.