Best Open-Source Vector Databases (2026)
Ranked by GitHub stars, with PyPI monthly downloads, license and latest release — auto-collected and refreshed, never hand-maintained.
| # | Tool | Stars | PyPI/mo | License | Latest |
|---|---|---|---|---|---|
| 1 | Milvus | 44,805 | 5,919,923 | Apache-2.0 | v2.6.18 |
| 2 | FAISS | 40,308 | 17,779,635 | MIT | v1.14.3 |
| 3 | Qdrant | 32,389 | 23,963,183 | Apache-2.0 | v1.18.2 |
| 4 | Chroma | 28,456 | 13,590,061 | Apache-2.0 | 1.5.9 |
| 5 | pgvector | 21,794 | — | NOASSERTION | — |
| 6 | Weaviate | 16,337 | 160,772,415 | BSD-3-Clause | v1.38.0 |
| 7 | LanceDB | 10,627 | 7,249,640 | Apache-2.0 | python-v0.33.1-beta.2 |
| 8 | Vespa | 6,959 | 8,505,418 | Apache-2.0 | v8.707.16 |
| 9 | Marqo | 5,022 | 48,238 | Apache-2.0 | 2.26.0 |