Weaviate

Weaviate combines vector search with structured data and hybrid retrieval, letting an application balance semantic similarity against exact terms. It offers an open-source deployment and a managed cloud product; the official cloud page lists a free starting tier and paid plans whose charges change with storage, dimensions, and deployment choices. Builders can use it for search and retrieval-augmented generation, but should not assume that a database choice alone determines answer accuracy. Create a representative evaluation set, compare hybrid and vector-only retrieval, and include embedding and query-agent charges in the total cost.