Are ZigZag returns free?

I understand that ZigZag is a popular tool used in financial analysis, particularly in the cryptocurrency and finance world. However, I'm curious about the cost associated with using ZigZag returns. Are ZigZag returns completely free to access and utilize, or do they come with any kind of subscription fee or other costs? It would be helpful to know this information before deciding whether or not to incorporate ZigZag returns into my analysis and decision-making processes.