Yes this is rhe best app in android platform. The concept is great. This make technology devolpment. If you dont have this app. Then go download from playstore. The use of the app is that it help us to do math problems. If we got a tough math problem with answer, we sometimes wants to know how the answer was got. There the app helps as, we just want to open app and take the photo of problem then select the option and we can see the derivation of problem.