Magako is an AI based on symbolic mathematics to help teenagers in math. Think of something like Mathematica used to correct math exercises and show hints when a student is stuck. The UI allows to solve exercises interactively as shown in this video: https://youtu.be/honHcFguXsQ
I know there are many apps or websites offering some kind of online math exercises, but I believe the AI makes Magako unique.
I have built a prototype version for the web ( http://magako.com ) and for Android ( https://play.google.com/store/apps/details?id=org.test.magako ), the latter having a bit more math content.