Azure Websites vs. AppFog vs. Modulus

Azure Websites is a fully managed Platform-as-a-Service (PaaS) that enables you to build, deploy and scale enterprise-grade web Apps in seconds. Focus on your application code, and let Azure take care of the infrastructure to scale and securely run it for you.

AppFog provides the infrastructure web developers need to build apps without worrying about IT tasks or having to wait days to get servers ready for writing code. AppFog’s web application technologies include PHP, NodeJS, Ruby, Python, Java, .NET, MySQL, and PostgreSQL.

Modulus is a premier Node.js hosting platform that provides a complete technology stack for application developers. This includes custom SSL, WebSockets, MongoDB, statistics, and more.