App Inventor ActivityStarter is a development tool for App Inventor from the Massachusetts Institute of Technology (MIT). It lets you play with activities and has more than 100 examples of activities. This app is actually a kind of Activity Starter component. You can make your own activity with all the fields you have in the Activity Starter component in App Inventor and execute the activity. If you want to learn more about the activity starter component in app inventor, then this app is for you