Exist is described as 'Lets you keep track of your life with advanced analytics that work across multiple services, as well as manual tracking for anything you can think of' and is a Habit Tracker in the sport & health category. There are more than 50 alternatives to Exist for a variety of platforms, including iPhone, Android, iPad, Web-based and Android Tablet apps. The best Exist alternative is Loop Habit Tracker, which is both free and Open Source. Other great apps like Exist are Habitica, YA Habit Tracker, StoryPad and Perfice.
It aggregates data from multiple sources and draws conclusions. Most other alternatives do not have the same amount of API integrations as gryoscope, zenobase, exist.io