The App: Waterlogged, free, iOS.
The Gist: Dry mouth, chapped lips, headaches, and tiredness could all be signs that your body isn't getting enough water. It can be hard to get in those eight glasses, but with Waterlogged you can track your intake and get updates on how you're doing with your daily 64 ounces. Notifications appear on your home screen with the number of ounces left to go—the glaring red sign acts as one of the most encouraging drinking games ever.
The App: Calm, free, iOS and Android.
The Gist: Meditation shouldn't be a chore; with Calm, it's just a routine practice that you do before you sleep, when you wake up, or even when you're at your desk. Receive daily inspirations, do breathing exercises, and practice other relaxing exercises, like listening to nature sounds or looking at serene photo collections—because sometimes even a cliché sunset shot can ease stress and clear out brain fog.