API Builder combines a framework for building mobile APIs with an elastically scalable cloud service for running them. There are connectors for Salesforce, Microsoft Azure, MySQL, Mongo DB, Box, Swagger, and others. Appcelerator also provides ready-made back-end services for geolocation, photo storage, authentication, key value pair storage, and others.
Appcelerator offers free access to the Titanium SDK, API Builder and basic analytics, charging $99 per seat per month for access to collaboration tools, App Designer, App Preview, and a longer analytics history. Additional features are available in an costlier Enterprise package.