Widget synchronization architectures, methods, systems, and computer readable media are described. One exemplary embodiment includes a first software component which is configured to cause retrieval and storage of data for a first data class for one or more widgets from a first store of the data on a device, such as a first data processing system, and is configured to synchronize data for the first data class in the first store with data of the first data class in a second store on at least one of a host or another device, such as a second data processing system. The first software component is separate from a widget application software which provides a user interface to allow a user to use the data. The first software component synchronizes the structured data through a second software component which interfaces with the host and the device.