Best Vector Databases

Vector databases are specialized storage systems for high-dimensional embeddings, enabling efficient similarity search, recommendation systems, semantic search, and retrieval-augmented generation. Included are open-source libraries, self-hosted servers, and managed cloud services built specifically for vector workloads. Vector extensions in general-purpose relational or NoSQL databases are excluded. Primary selection criteria are query speed and scalability, indexing algorithm support, metadata filtering capabilities, and total cost of ownership.