Google App Engine (also referred to as GAE or App Engine) is a cloud computing platform used as a service for developing and hosting web applications. Applications are sandboxed and run across multiple Google-managed servers. GAE supports automatic scaling for web applications, allocating more resources to the web application as the amount of requests increases. It was released as a preview in April 2008 and launched officially in September 2011.

Applications written in Go, PHP, Java, Python, Node.js, .NET, and Ruby are supported by the App Engine, and other languages can be supported at an additional cost. The free version of the service offers a standard environment with limited resources. Fees are charged for additional storage, bandwidth, or instance hours.