When comparing AppFog vs dotCloud, the Slant community recommends AppFog for most people. In the question“What are the best hosting services for Node.js apps?” AppFog is ranked 4th while dotCloud is ranked 5th. The most important reason people chose AppFog is:
Limits are based on total memory allocation, you can allocate as much RAM as you want for each instance. Even the pricing is based on the total amount of RAM allocated, $0.04/GB.
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Pros
Pro Allows multiple app instances
Limits are based on total memory allocation, you can allocate as much RAM as you want for each instance. Even the pricing is based on the total amount of RAM allocated, $0.04/GB.
Pro 24/7 live chat support
While it's true that AppFog may be relatively new and the online support is not very extensive, they offer 24/7 professional live chat support for any questions or problems you may have.
Pro Simple command-line deployment tool
AppFog has a simple command line utility to recursively push a directory to production
Pro Supports multiple data centers worldwide
AWS US, Europe, Asia, Rackspace, HP, Azure, and even Private Clouds.
Pro Adjust per-instance memory
Most other PaaS providers only allow for multiple, low-memory instances for horizontal scaling, but dotCloud also allows for vertical scaling and resource-heavy applications by adjusting per-instance memory availability.
Pro Quick deployment
dotCloud is usually very fast when it comes to deploying your project. The CLI tool is very good at that and deploys your build almost as soon as you push it.
Pro Thorough Documentation
The documentation is very good an explains everything in-depth.
Pro Support for various types of databases
Supports Postgres, MongoDB, RabbitMQ, Redis, and MySQL. All of these can be used without any additional pricing, no need to pay for expensive addons.
Cons
Con Slow deployment
The deployment process with AppFog is generally nice and easy because of its CLI. Unofrtunately the only downside of that process is the fact that it takes too long. A deployment to AppFog genereally takes up to 40 seconds, which should be fine if you are deploying once a week, but when you deploy every hour it starts bothering you too much.
Con Poor database performance
When your databases have a very high write volume dotCloud starts having some serious problems keeping up with it. Performance drops completely and in the worst case scenario the database crashes and starts going down daily.