AppScale vs Deis: 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, Deis is detailed as "Open Source PaaS that builds upon Docker and CoreOS to provide a lightweight PaaS with a Heroku-inspired workflow". Deis can deploy any application or service that can run inside a Docker container. In order to be scaled horizontally, applications must follow Heroku's 12-factor methodology and store state in external backing services.

AppScale and Deis belong to "Platform as a Service" category of the tech stack.

Some of the features offered by AppScale are:

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

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

• Deis can deploy any language or framework using a Dockerfile
• If you don't have a Dockerfile, Deis includes Heroku buildpacks for Ruby, Python, Node.js, Java, Clojure, Scala, Play, PHP, Perl, Dart and Go.
• Deis can be deployed on any system that supports CoreOS including your workstation, as well as most public clouds, private clouds and bare metal.

AppScale and Deis are both open source tools. It seems that Deis with 6.12K GitHub stars and 863 forks on GitHub has more adoption than AppScale with 2.39K GitHub stars and 273 GitHub forks.