Vector Databases: FAISS vs Pinecone vs Weaviate vs ChromaDB
~13 min read
A quick, practical comparison of the four vector databases you'll encounter most — a local library, a managed cloud service, and two flexible open-source servers — and when to reach for each.
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Key points
- •FAISS is a fast, free library you embed in your app — gives you the search algorithm, not persistence/metadata/scaling, which you build yourself
- •Pinecone is a fully-managed cloud service — zero infrastructure to run, at the cost of a subscription and your data living on a third party's servers
- •Weaviate and ChromaDB are open-source, self-hostable full databases with metadata filtering that raw FAISS lacks
- •ChromaDB optimizes for the fastest path to a working prototype; Weaviate targets larger production deployments with more built-in features
- •All four ultimately run the same core ANN search underneath — the choice is about operational tradeoffs (control vs convenience, self-hosted vs managed), not different search capability