haystack vs milvus
haystack and milvus are two comparable projects, each with trade-offs depending on your needs. milvus is the more popular choice (44,779 vs 25,567 stars). Both are Apache-2.0-licensed.
| haystack | milvus | |
|---|---|---|
| Summary | Haystack is an open-source Python framework for orchestrating LLM applications through modular, traceable pipelines and agent workflows. It gives explicit control over retrieval, routing, memory, and generation to build RAG systems, semantic search, and autonomous agents that are model- and vendor-agnostic. | milvus is an open-source Go project with 44.7k GitHub stars. It is associated with anns, cloud-native, diskann, distributed. The repository is actively maintained, with recent commits. |
| Category | RAG / Vector DBs | RAG / Vector DBs |
| Language | MDX | Go |
| License | Apache-2.0 | Apache-2.0 |
| Stars | 25,567 | 44,779 |
| Downloads/wk | — | — |
| Security | — | — |
| Health | 100 | 100 |
| Last commit | 6/12/2026 | 6/15/2026 |
| Source | GitHub | GitHub |