Radarr is a movie collection automation manager that monitors media sources to automatically download, organize, and upgrade digital movie files. It functions as a service that integrates with Usenet and BitTorrent download clients to handle the retrieval and error management of files without manual intervention.
The system distinguishes itself through a modular provider architecture that supports dynamic loading of external indexers and download clients. Users can define specific resolution and format requirements through custom quality profiles, which the application uses to automatically acquire and upgrade media to meet preferred viewing standards.
Beyond core automation, the software maintains a local media library by monitoring directory structures and managing file organization. It also acts as a metadata organizer, fetching and arranging movie information, posters, and subtitles to ensure compatibility with external media server software. All internal logic is exposed through a structured interface, allowing for integration with external services and persistent storage of configuration and history.
