Vector Databases
Stores that index embeddings and answer nearest-neighbor queries fast. The core of RAG retrieval — choose by scale, hosting, and whether you want a dedicated engine or a Postgres extension.
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Chroma
Chroma
Open-source embedding database for RAG — store vectors and query by similarity in a few lines.
LanceDB
LanceDB
Embedded vector database built on the Lance columnar format — serverless and local-first
Milvus
Zilliz
Open-source vector database built for billion-scale similarity search
pgvector
pgvector
Postgres extension for vector similarity search — add agent memory and RAG without a separate database.
Qdrant
Qdrant
High-performance open-source vector database for similarity search and agent memory
Weaviate
Weaviate
Open-source vector database with hybrid search, filtering, and built-in vectorizers