For some weird reason the app (timer) stopped working after a few months of installing the app. I used to use it everyday but now all I can do is uninstall it. it's kinda weird how this is an editors choice app. I would give this a five star if this was fixed. and it would be much better if this was not a timer. I would much more prefer if you can add a start button and when you finished studying you can just stop it instead. you can't really estimate the time it takes for you to study.