Considering that the recent electronic music explosion has run parallel to the proliferation of music streaming services, it's a wonder that an app like Pacemaker hasn't already been downloaded by every last millennial with an iPhone. The app automatically turns user-compiled playlists into seamless DJ mixes - and its 2.0 version has just been released.
Pacemaker's proprietary algorithm works in conjunction with Spotify by buffering its music stream for a fraction of a second to take data points from a collection of tracks - which the developers call a "recipe" - and build transitions between each one based on tempo. Users designate the point in each song where the transition takes place, and Pacemaker 2.0 features an update that allows users to remix each other's playlists.
It bears mention that not only has Pacemaker been around in the form of an app since 2014, but it's an adaptation of technology first implemented in a piece of hardware of the same name that came out in 2008. Although it was eventually discontinued, you can see it in action in the video below:
While Pacemaker is currently integrated with Spotify, it still has yet to announce official partnerships with other services like YouTube, Mixcloud or SoundCloud. Seeing as how it just came to light that Spotify might purchase SoundCloud, however, they might check names off that list sooner rather than later.