Pyyan / Compare / Vespa vs pgvector vs Milvus
Vespa vs pgvector vs Milvus
3 of 5Vector Databases · verified 13 Aug 2026
| Specification | Vespa | pgvector | Milvus |
|---|---|---|---|
| Summary | Search engine first, vector store second. | Vectors inside the database you already run. | Built for billions of vectors. |
| Index | HNSW plus inverted | HNSW, IVFFlat | HNSW, IVF, DiskANN, GPU |
| Hybrid search | Yes, native | Yes, with SQL | Yes |
| Hosting | Self-host and managed | Self-host or any managed Postgres | Self-host and managed |
| Licence | Apache 2.0 | PostgreSQL | Apache 2.0 |
| p50 latency | ~10ms | ~15ms | ~10ms |
| Category | Vector Databases | Vector Databases | Vector Databases |
| Official | Vespa.ai ↗ | PostgreSQL ↗ | Zilliz ↗ |
Highlighted rows are where these differ.
Vespa
- Yahoo's engine, open sourced; runs enormous production workloads
- Steep learning curve, unmatched ranking control
Best for complex ranking at very large scale.
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.
Milvus
- Distributed architecture with GPU index support
- Heavier to operate than the alternatives
Best for very large corpora.