Weaviate's main technical bet is hybrid search built natively into the database rather than stitched together across two systems: a single query can combine BM25 keyword matching with vector similarity, which tends to produce better results than pure semantic search alone, especially for queries that include exact terms like product codes or names that embeddings handle poorly.
Its Query Agent adds a layer on top that routes natural-language questions across multiple collections automatically, so an application doesn't need to hardcode which collection a given query should hit. The database itself is open source under the BSD-3-Clause license, which means self-hosting is genuinely free with no feature gating between the open-source version and what's available on the managed cloud offering.
Weaviate Cloud has an always-free tier for small projects and paid plans starting around $45 a month. It sits in the same competitive set as Pinecone, Qdrant, and Chroma, differentiating mainly on hybrid search quality and its willingness to let self-hosted users run the full feature set for free.