Infrastructure layer
Vector databases
Stores built for similarity search — the memory layer behind retrieval.
pgvector
★Vector databases
A PostgreSQL extension that adds vector similarity search to a database you already run.
Chroma
Vector databases
An open-source embedding database designed to be the simplest way to start with RAG.
Elasticsearch
Vector databases
The widely deployed search engine, now with dense vector and hybrid search built in.
LanceDB
Vector databases
An open-source, embedded vector database built on the Lance columnar format.
Milvus
Vector databases
An open-source vector database built for billion-scale similarity search.
Pinecone
Vector databases
A fully managed vector database that removes all operational work from similarity search.
Qdrant
Vector databases
A fast open-source vector database with rich filtering, built for production retrieval.
Redis
Vector databases
Vector search inside Redis — similarity search alongside the cache you already run.
turbopuffer
Vector databases
A serverless vector and full-text search engine built on object storage for low cost.
Vespa
Vector databases
An open-source engine for large-scale search, recommendation, and vector workloads.
Weaviate
Vector databases
An open-source vector database with hybrid search and built-in vectorization modules.