Pyyan / Compare / Haystack vs LlamaIndex vs LangChain & LangGraph
Haystack vs LlamaIndex vs LangChain & LangGraph
3 of 5RAG & Knowledge Graphs · verified 13 Aug 2026
| Specification | Haystack | LlamaIndex | LangChain & LangGraph |
|---|---|---|---|
| Summary | A strict pipeline abstraction, built for regulated work. | The strongest option for document-centric retrieval. | Orchestration, with retrieval as one piece. |
| Kind | Framework | Framework | Framework |
| Graph | Via integrations | Yes, property graph index | Via integrations |
| Language | Python | Python, TypeScript | Python, TypeScript |
| Licence | Apache 2.0 | MIT | MIT |
| GitHub stars | ~20k | ~45k | ~120k |
| Category | RAG & Knowledge Graphs | RAG & Knowledge Graphs | RAG & Knowledge Graphs |
| Official | deepset ↗ | LlamaIndex ↗ | LangChain ↗ |
Highlighted rows are where these differ.
Haystack
- Every step is declared, which is what audits need
- Cleanest option where a wrong answer has consequences
Best for finance, health, legal and government.
LlamaIndex
- Deep document handling and many indexing strategies
- The common advice is LlamaIndex for retrieval, LangGraph for orchestration
Best for PDFs, knowledge bases, structured data.
LangChain & LangGraph
- LangGraph adds durable state and checkpointing
- Widely used, and widely argued about
Best for agents that retrieve as one step among many.