Cue by Humana (Free)

While many apps focus narrowly on individual aspects of your health, Cue by Humana aims to promote healthy behavior by reminding you to take many small steps that add up to overall good health. The app nudges you throughout the day to practice healthy habits, like drinking more water, stretching periodically, focusing on your breathing, and spending time outdoors. A colorful, easy-to-read chart tracks your progress throughout the day to make sure you haven't missed any of your cues.