Sonarr is a multi-platform file sharing application and software designed for downloading, organizing, and managing TV shows and movies. It is a powerful and intuitive program that automates downloading, renaming and organizing your media files. Sonarr allows you to set up and maintain a library of TV shows and movies, and automatically download and organize them as they become available. It supports a variety of different file formats and sources, including Usenet and BitTorrent, and integrates with almost any indexer or tracker. With Sonarr, you can automatically search for new episodes, download them, rename them, and move them to their appropriate destination. Sonarr also provides a web-based interface for managing your media library, allowing you to quickly search for shows, manage download queues, and more.
Radarr is for movies. Sonarr is for television programs. Both great, but not alternatives.