Pyyan / Compare / Redis vs pgvector vs Milvus
Vector Databases · verified 13 Aug 2026
| Specification | Redis | pgvector | Milvus |
|---|---|---|---|
| Summary | In-memory, so very fast and RAM-bound. | Vectors inside the database you already run. | Built for billions of vectors. |
| Index | HNSW, FLAT | HNSW, IVFFlat | HNSW, IVF, DiskANN, GPU |
| Hybrid search | Yes | Yes, with SQL | Yes |
| Hosting | Self-host and managed | Self-host or any managed Postgres | Self-host and managed |
| Licence | RSALv2 / SSPL | PostgreSQL | Apache 2.0 |
| p50 latency | 5ms | ~15ms | ~10ms |
| Category | Vector Databases | Vector Databases | Vector Databases |
| Official | Redis ↗ | PostgreSQL ↗ | Zilliz ↗ |
Highlighted rows are where these differ.
Best for caches and hot vector sets.
Best for almost everyone, until scale says otherwise.
Best for very large corpora.