This app is sooo not ready to roll out. Three times I entered words to see what sentences were in the system, but all three were not found. These were not foreign terms, nor particularly difficult. If you think this app will help you with studying for the SAT or GRE you will be most disappointed. At best I saw words at an 8th grade level. Most were much easier than that. I love the concept, but this app has a long way to go. I'll try back in a year or so.