content: Overall it is a very helpful app. The interface is beautiful. However the fact that it doesnt vibrate when it finishes is annoying because I have to make the notification sound louder and it gets distracting. Also most of the users here are students and Im sure only a handful can actually pay for the pro. I truly hope you can add more features to the free version because it is not that easy for a student to pay. For example more trees available login and sync.