AppScale vs tsuru: What are the differences?

Developers describe AppScale as "An open source implementation of Google App Engine. Run your applications in any cloud- public, private or hybrid". AppScale is a platform that allows users to deploy applications developed using the Google App Engine APIs over Amazon EC2, Rackspace, Google Compute Engine, Eucalyptus, Openstack, CloudStack, as well as KVM and VirtualBox. On the other hand, tsuru is detailed as "Extensible and open source Platform as a Service software". tsuru is an open source polyglot cloud application platform (PaaS). With tsuru, you don’t need to think about servers at all. You can write apps in the programming language of your choice, back it with add-on resources such as SQL and NoSQL databases, memcached, redis, and many others. You manage your app using the tsuru command-line tool and you deploy code using the Git revision control system, all running on the tsuru infrastructure.

AppScale and tsuru can be categorized as "Platform as a Service" tools.

Some of the features offered by AppScale are:

• UI & Dashboard
• Manage Apps, Machines, and Logs
• Automated Data Persistence

On the other hand, tsuru provides the following key features:

• Fast and secure. The entire process is really simple with no special tools needed, just a simple git push.
• Scaling in Tsuru is completely painless. Just add a unit and Tsuru will take care of everything else.
• Tsuru is built to be extensible. Through services you can provide anything your application needs.

AppScale and tsuru are both open source tools. tsuru with 3.14K GitHub stars and 421 forks on GitHub appears to be more popular than AppScale with 2.39K GitHub stars and 273 GitHub forks.