A development application can provide an integrated development environment that interfaces with one or more data sources that will be used by the application under development. Sample data from the source(s) can be used to aid the coding process and/or testing the application under development. The development application can maintain a cache to support offline access of data from the source(s) to allow development to continue when a source cannot be accessed and/or when a developer wishes not to access a particular source. Code elements can be included in the application under development to cause the application under development to access the cached data based on settings in the development application. The added code elements can automatically be removed when the application is released.