The newest app in this genre, Mute tracks screen-time and pickups, and logs your “detox streaks” with an emphasis on celebrating the latter.
Moment sets daily limits on your usage, and will even try to force you off the device with a barrage of notifications if you choose that option.
Space starts with a quiz to assign you a phone-user “type” (from Rabbit Hole Wanderer to Sticky Social Mitt) and then helps you set goals to change your habits.
Aimed at students, Hold tracks how much time they spend not using their phone, and converts that into points to be redeemed for real-world rewards.
Forest takes a different approach: starting the app plants a virtual tree, which grows for as long as you don’t quit the app (and thus use other ones), but dies if you exit.