Swift switcher (com.sureshot.simplyswitch) on Google Play
This app helps you switch between apps with just a swipe. To move to the next app, simply swipe left from the right edge of the screen, and vice versa. It's particularly useful if you want to switch between two apps frequently, like while recording a song while playing guitar, you'd want to switch between the recorder app and your browser in which you've opened the lyrics of a song. This helps you switch apps very quickly .Watch the demonstration video to see what this app exactly does.