Pacemaker

Back in the pre-iPhone days, a little gadget called the Pacemaker Pocket DJ made a big impression — it was the world's first portable DJ system. Now you can get the same functionality right on your wrist. Pacemaker lets you mix, loop, blend, and drop all you want, using tracks from your own music library or any of the millions of tracks on Spotify, on your iPad, your iPhone, or, for DJs that want to roam the floor during sets, your Apple Watch. Best of all, it's completely free to try, with only the well-built effects costing you any coin.