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Open-source vector databases
9 open-source vector databases tools. Vector Databases tools listed as Free because they are open-source projects you can download and run. Check each project's license, and note that hosting and model costs may still apply.
How to read this page. The tools are grouped by category and are not ranked. Pricing labels come from vendors' own pages when we could confirm them. Always verify plans and limits on the vendor's site.
Vector Databases (9)
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| Annoy | Open-source library from Spotify for approximate nearest neighbor search. | Free | Official site |
| FAISS | Meta's open-source library for efficient similarity search over dense vectors. | Free | Official site |
| hnswlib | Open-source header-only C++/Python library for fast approximate nearest neighbor search. | Free | Official site |
| ParadeDB | Postgres extension and distribution for full-text search and analytics, used alongside vector search. | Free | Official site |
| pgvector | Open-source vector similarity search extension for PostgreSQL. | Free | Official site |
| ScaNN | Google open-source library for efficient vector similarity search. | Free | Official site |
| txtai | Open-source embeddings database for semantic search and LLM workflows. | Free | Official site |
| USearch | Open-source single-file vector search and clustering engine. | Free | Official site |
| Vald | Open-source, cloud-native distributed approximate nearest neighbor vector search engine. | Free | Official site |