Most functions cannot be used without the app. It's ok, but I didn't realize you had to register your information and have location services turned on to use it. It seems a bit intrusive, why would they need to know my location? Face tracking isn't great, you can adjust settings according to slower/faster tracking, but having face tracking enabled will take random shots of you as you move. Gestures feature sets synced photos when you make a peace sign gesture; However, he often doesn't understand the gesture, and if he does, you've left the striking position you were trying to get into. It also drains your phone's battery pretty quickly. While the idea behind it is cool, it's just not functional, so I'll be back for that reason and for privacy reasons.