Zilliz (Milvus) vs pgvector (PostgreSQL Extension)
Side-by-side from the Top 11 ranking of Pinecone vs Weaviate vs Zilliz: 11 Best Vector Databases 2026. Last verified May 31, 2026.
The short answer
Zilliz (Milvus) ranks higher on Top 11 (#3 vs #11) for AI engineers building RAG and semantic search at scale. The go-to for massive-scale, enterprise deployments based on open-source Milvus.
At a glance
| Zilliz (Milvus) | pgvector (PostgreSQL Extension) | |
|---|---|---|
| Top 11 rank | #3 / Pinecone vs Weaviate vs Zilliz: 11 Best Vector Databases 2026 | #11 / Pinecone vs Weaviate vs Zilliz: 11 Best Vector Databases 2026 |
| Score (out of 9.4) | 9 | — |
| Best for | Enterprise-grade massive scalability | Vector search inside PostgreSQL |
| Pricing | $$$ (Free to custom/enterprise) | $ (Open source) |
| HQ | Redwood City, USA | Open Source |
| Founded | 2017 | — |
Zilliz (Milvus)
The go-to for massive-scale, enterprise deployments based on open-source Milvus.
zilliz.comSee full entry in Pinecone vs Weaviate vs Zilliz: 11 Best Vector Databases 2026
pgvector (PostgreSQL Extension)
A pragmatic choice for adding vector search to an existing Postgres stack.
github.com/pgvector/pgvectorSee full entry in Pinecone vs Weaviate vs Zilliz: 11 Best Vector Databases 2026
Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.