The new Pacemaker app that launched this week and allows you to DJ on your iPad using the almost infinite Spotify music library. You can also include your own music from iTunes as well.
The app looks to be fully functional, with two decks, a crossfader, waveform reads, EQs, bpm, and effects. It even has a sync button for the noobs and a scratch effect option for the olds.
MAGNETIC RECOMMENDS:Pioneer Announces DDJ-SB
Check it out-
The the pacemaker app is available for free for Spotify Premium users. A free trial is also available. Download it off of iTunes.