Pyyan / Compare / Milvus vs pgvector vs Weaviate
Milvus vs pgvector vs Weaviate
3 of 5Vector Databases · verified 13 Aug 2026
| Specification | Milvus | pgvector | Weaviate |
|---|---|---|---|
| Summary | Built for billions of vectors. | Vectors inside the database you already run. | Hybrid search with batteries included. |
| Index | HNSW, IVF, DiskANN, GPU | HNSW, IVFFlat | HNSW |
| Hybrid search | Yes | Yes, with SQL | Yes, native |
| Hosting | Self-host and managed | Self-host or any managed Postgres | Self-host and managed |
| Licence | Apache 2.0 | PostgreSQL | BSD-3 |
| p50 latency | ~10ms | ~15ms | ~12ms |
| Category | Vector Databases | Vector Databases | Vector Databases |
| Official | Zilliz ↗ | PostgreSQL ↗ | Weaviate ↗ |
Highlighted rows are where these differ.
Milvus
- Distributed architecture with GPU index support
- Heavier to operate than the alternatives
Best for very large corpora.
pgvector
- One database for vectors, rows and joins
- The honest default: reach for something else only when this stops working
Best for almost everyone, until scale says otherwise.
Weaviate
- Vector, BM25 and metadata filters in one query
- Modules for embedding generation built in
Best for hybrid keyword and semantic search.