Koel is a self-hosted music streaming server that allows users to stream personal audio collections from a private server to any web browser. It functions as a multi-user audio library, supporting independent user libraries and single sign-on authentication.
The platform integrates cloud storage drivers to host and serve music files from third-party providers and utilizes a metadata aggregator to enhance local library data and track listening history via external services. It also includes a natural language interface for executing playback commands and navigating the music library.
The system covers media library management, including playlist organization and the scanning of local audio collections. It manages data through relational metadata mapping and communicates between the backend and frontend via a structured API.