Hello App Inventor is a book about Android application development authored by Paula Beer and Carl Simmons. The book is targeted to developers that are new to Android programming. Readers will learn about App Inventor, a cloud-based visual programminglanguage platform that allows developers to design and build apps for Android phones using only their Internet browser. Instead of typing out complex code, developers use a graphical environment to craft programs. Users drag and drop objects on the screen and plug blocks of code together like a jigsaw puzzle.