Here is a list of demo tutorials for PredictionIO.
Tapster iOS Demo
Similar product recommendation in an iOS Swift app built by Minh-Tu Le
URL: https://github.com/minhtule/Tapster-iOS-Demo
Tutorial: https://github.com/minhtule/Tapster-iOS-Demo/blob/master/TUTORIAL.md
NoGoodGamez
PS3/PS4 game Recommendation built by pashadude
OnTapp
Beer recommendation app built by Victor Leung.
Writeup: http://victorleungtw.com/prediction-io/
Yelpio
Business Recommendation built by TRAN QUOC HOAN, Inhwan Lee, and 山本直人.