These days, apps have to offer something either truly fun or truly useful to be successful. Endel hopes to pull this off by connecting your health with sleep, relaxation, and focus via personal soundscapes. It makes use of an algorithm that combines heart rate, weather, time of day, and location and creates tracks for four states: Relax, Focus, On-the-Go, and Sleep. The idea is total immersion and maximizing of each state. It also pairs with the iOS Health app for the most accurate personal data. After each week, Endel provides a visual synopsis to show your performance, as well as how to improve. Start with a free 7-day trial and the move to subscription-based usage if you find that Endel meets your needs to make the most of your days and nights.