pgvector
VerifiedVector similarity search as a Postgres extension.
pgvector adds vector storage and similarity search to PostgreSQL, so you can keep embeddings alongside relational data without a separate system. Supported by most managed Postgres providers.
License
Open source (PostgreSQL License)
Deployment
Self-hosted, Managed
Pricing
Free extension; you pay only for the Postgres instance that hosts it.
SDKs / languages
SQL, Any (via Postgres driver)
Strengths
- No new system to operate
- Keeps vectors next to relational data
- Available on most managed Postgres
Limitations
- Not purpose-built for billion-scale
- Tuning/index choice is on you
Alternatives
Chroma
Developer-friendly open-source embedding database.
LanceDB
Embedded, serverless vector database on the Lance columnar format.
Milvus / Zilliz
Scalable open-source vector database for billion-scale search.
MongoDB Atlas Vector Search
Vector search built into MongoDB Atlas documents.
Pinecone
Fully managed, serverless vector database.
Qdrant
Fast open-source vector search engine written in Rust.
Facts verified 19 July 2026. Neutral summary, not an endorsement; verify current details with the vendor.