Is the RAI app free?

I'm curious, does the RAI app come without any cost? Are there any hidden fees or charges associated with using the app? Or is it truly a free service for users to enjoy? It would be great to know upfront so I can make an informed decision about whether or not to download and use the RAI app. Additionally, are there any premium features that would require a fee or subscription? It would be helpful to have this information before proceeding.