Heroku vs. Azure Websites vs. Aerobatic

Heroku is a cloud application platform – a new way of building and deploying web apps. Heroku lets app developers spend 100% of their time on their application code, not managing servers, deployment, ongoing operations, or scaling.

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.

In a nutshell, it's a platform as a service (PaaS) for HTML5 web apps. You could think of it as Heroku for the front-end. It provides a streamlined developer workflow and a suite of cloud-based smart hosting modules that are highly complementary to your custom app code running in the browser.