Instance classes

Applications running in the App Engine standard environment are allocated compute resources based on instance classes. Developers can specify an instance class for a given service as part of the service's configuration, illustrated as follows:

 

Instance classes are divided into two groups, based on the type of scaling used in your service. If no scaling type is defined, App Engine will use automatic scaling by default. If no instance class is specified, App Engine will run your application using the default instance class—F1 for automatic scaling and B1 for basic and manual scaling.