Developer: As Written Productions
Free to sample 17 of the sermons, full library of over 100 sermons is $8.99
Available for iPhone only but works well on iPad in 2x mode

MP3 Catholic Sermons streams to your iPhone or iPad audio renditions of sermons of the Fathers of the Catholic Church. Included are sermons from St. John Chrysostom, St. Augustine, St. Ephrem, St. Leo the Great, St. Gregory the Great and many more.

Each sermon is about an hour long and since they are streamed online, no additional storage space is taken up by the audio files. You will, however, need an Internet connection to listen to the sermons. 

There are four categories of sermons to choose from; About the Fathers, Gospel Sermons, Sin and Judgment, and Wisdom of the Fathers. The free try-out version has 17 sermons and the upgraded version has over 100 sermons. You can upgrade to the full version for $8.99 as an in-app purchase.

Favorite sermons can be added to a favorites list for easy access and in the settings menu the app can be set to automatically play the next track.

iTunes: https://itunes.apple.com/us/app/mp3-catholic-sermons/id426247719?mt=8&ign-mpt=uo%3D4
Developer: http://www.catholicmp3vault.com/