Social butterflies will get a kick out of Habit Tracker, the first habit app that lets you build habits with friends. First, select the habits that you want to build. Then, friends that also have the app can join your group. Throughout the day, check back for real-time notifications when your group meets their goals for the day, like drinking water, walking, and eating vegetables. It's perfect for those with a competitive streak or those who want to encourage their besties to live their best lives, too.