Open-source vector database comparisons
Neutral, data-driven comparisons — rankings, head-to-head and selection guides. Every number is auto-collected from GitHub & PyPI and refreshed regularly. No stale tables.
Top vector databases
Milvus
44,805 ★ · Apache-2.0
FAISS
40,308 ★ · MIT
Qdrant
32,389 ★ · Apache-2.0
Chroma
28,456 ★ · Apache-2.0
pgvector
21,794 ★ · NOASSERTION
Weaviate
16,337 ★ · BSD-3-Clause
By use case
Best Vector Databases for RAG
strong metadata filtering + hybrid search + an easy managed option
Best Self-Hosted Open-Source Vector Databases
can be run on your own infrastructure (no managed-only lock-in).
Best Lightweight Vector Databases
low operational overhead
Best Vector Databases for Production / Scale
built for large-scale, high-throughput production workloads.