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App Inventor is a fairly simple drag and drop environment (partly adapted from the Scratch environment) which enables you to develop applications for Android phones. It is based in a web browser and all your projects are stored on Google servers. It is suitable for Windows, Mac and Linux operating systems. Even if you don't own an Android phone you can still use App Inventor because Google includes an emulator, enabling you to see and test your programs on your computer. And the good part is that it is all free!
There are two main parts to App Inventor:
1. The App Inventor Designer, where you choose the components (such as buttons, images, labels etc) that you will use in your app.
2. The Blocks Editor, where you drag interlocking blocks together which describe the behaviours of your components. eg When clicked, do ....
If you have an Android phone connected (or you can use the emulator), you can test your work as you build it. When you are finished you can package it as a stand alone application.



