Hosted applications are developed to be run in a hosted network environment and with access to host resources such as server databases and messaging systems. The host applications may include tag based requests for host resources. A platform-specific native host is used on a mobile device which interacts with a hosted application and identifies content-based request for host resources. The native host then determines and performs appropriate functionality in the context of a mobile platform to satisfy the host resource request. Hosted applications may thereby be run natively on mobile devices of various mobile platforms and accessed even when the mobile devices lack network connections.