AppScale is an application platform that allows you to run apps built using the Google App Engine APIs on any infrastructure, from public clouds (such as EC2 and GCE) to private clouds (such as OpenStack and Eucalyptus). With AppScale, users can leverage Google App Engine's rapid development model while also ensuring that their applications remain portable. For existing Google App Engine users, AppScale provides solutions to implement hybrid cloud, reduce monthly costs and allow applications to be accessible in China. The AppScale FastStart automatically deploys AppScale in a single-node test/dev environment and includes a sample guestbook application.