AppFog vs Modulus: What are the differences?

What is AppFog? Simple PaaS for Java, Python, Node, .Net, Ruby, PHP, MySQL, Mongo, and PostgreSQL. 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.

What is Modulus? Hosting, Scaling, and Data for Node.js applications. 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.

AppFog and Modulus can be primarily classified as "Platform as a Service" tools.

Some of the features offered by AppFog are:

• Launches fast, runs fast- Varnish Cache and op-code caching run applications with less server load and accelerated performance.
• Reduces ops work- No more configuring servers, firewalls, Apache, security, or installing frameworks.
• Plays well with any SCM- Versioning is critical. AppFog is compatible with code management systems like git, svn, and mercurial.

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

• Simple Scalability
• Powerful Statistics
• Multiple Node Versions

"The basic plan is free" is the top reason why over 3 developers like AppFog, while over 12 developers mention "Easy to set up and scale" as the leading cause for choosing Modulus.