Popsugar Culture Digital Life Best Design Apps 2015 Apple Says These Are the Best iPhone Apps of the Year November 16, 2015 by Ann-Marie Alcántara View On One Page Photo 4 of 6 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 Pacemaker Combine your iTunes music and Spotify playlists on Pacemaker (free). You can mess with the beats and feel like a DJ or just let the app do it for you. Previous Next Start Slideshow