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Pro Free version available
TuneIn Radio offers a free version of it's app with limited functionality.
Pro Does more than just podcasts
TuneIn Radio offers many different listening options inclusing AM/FM, Internet Radio and Podcasts. So while it does make a good podcast client, it also has more functionality than just a standard podcast player app.
Con Free version has in app purchases
Ranging from $0.99-$9.99 the free version includes in app purchases that unlock extra features for the app.