App Inventor consists of the Designer and the Blocks Editor. These are described in detail below.
App Inventor Designer
Design the App's User Interface by arranging both on- and off-screen components.
![](../sites/all/files/SetupAI2/DesignTab.png)
App Inventor Blocks Editor
Program the app's behavior by putting blocks together.
![](../sites/all/files/SetupAI2/BlocksTab.png)
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