Zilliz (Milvus) vs pgvector (PostgreSQL Extension)

Side-by-side from the Top 11 ranking of The 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 / The 11 Best Vector Databases (2026)#11 / The 11 Best Vector Databases (2026)
Score (out of 9.4)97.2
Best forEnterprise-grade massive scalabilityVector search inside PostgreSQL
Pricing$$$ (Free to custom/enterprise)$ (Open source)
HQRedwood City, USAOpen Source
Founded2017

Zilliz (Milvus)

The go-to for massive-scale, enterprise deployments based on open-source Milvus.

zilliz.com

See full entry in The 11 Best Vector Databases (2026)

pgvector (PostgreSQL Extension)

A pragmatic choice for adding vector search to an existing Postgres stack.

github.com/pgvector/pgvector

See full entry in The 11 Best Vector Databases (2026)

Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.