Algoriddim djay is the best app to get started on, in our opinion.  It provides an amazing, slick user interface that allows for the enthusiast to get a chance to learn more about dj techniques, right in the palm of your hand.  With the ability to plug into controllers such as the Pioneer DJ WeGo 4 or the Reloop Beatpad, we utilize these rigs in our kids programs across the world.  Packed with such enhanced features, the djay app also does something incredibly unique: it allows you to dj with your Spotify playlists!