Currently it is in beta, as far as I know it is iOS only. You can sign up here; https://tung.fm/ (just scroll to the bottom) — you need TestFlight (https://goo.gl/x24Pqs) and a free developer account from Apple (https://developer.apple.com/) as well to install the beta.
The social features are great, you can also donate to a favorite podcast if you are into doing that sort of thing. This is a game changer.
PS: I am not in anyway associated with Tung, I have just been testing the app and wanted to help get the word out. I really enjoy podcast, I listen to them daily. Here are some screenshots of the application: