I had given 5 stars in Jun 2017. I'm changing it to 1 star because of the full screen ads which cannot be dismissed. I'm grateful to the developer for creating this nice looking calendar app and was happy to tolerate the ads in the free version but the full screen ads really disrupt the process of adding an event to the point where it becomes intolerable. I'll just switch to Google calendar which syncs better anyway. Thanks for the few years of a great app.