Intrusive ads destroy the experience
This app has three kinds of advertisements 1. Horizontal bar at bottom off device - It covers part of the screen but is something I'd happily accept in a free and useful app. 2. Full screen static image ad - The image covers the screen and forces you to manually close it to continuing your studies. If this type of advertising is rare it can still be acceptable. (It's not rare) 3. Full screen video that cannot be closed - Instead of a static image the app serves you advertisement videos that you are forced to watch for at least 5 seconds. Summary: I'm the first to understand a developer's need to make money from a free app. But this app is showing you full screen ads, randomly switching between images and videos that can't be closed, at about EVERY 20th FLASH CARD you're reading. Making the app completely useless and causing me to write my first app review ever... So stay away from this app.