Pyyan / Compare / LightRAG vs LlamaIndex vs LangChain & LangGraph vs Haystack
LightRAG vs LlamaIndex vs LangChain & LangGraph vs Haystack
4 of 5RAG & Knowledge Graphs · verified 13 Aug 2026
×LangChain & LangGraphLangChaincurrent
| Specification | LightRAG | LlamaIndex | LangChain & LangGraph | Haystack |
|---|---|---|---|---|
| Summary | Graph retrieval at a fraction of GraphRAG's cost. | The strongest option for document-centric retrieval. | Orchestration, with retrieval as one piece. | A strict pipeline abstraction, built for regulated work. |
| Kind | Library | Framework | Framework | Framework |
| Graph | Yes, core | Yes, property graph index | Via integrations | Via integrations |
| Language | Python | Python, TypeScript | Python, TypeScript | Python |
| Licence | MIT | MIT | MIT | Apache 2.0 |
| GitHub stars | ~18k | ~45k | ~120k | ~20k |
| Category | RAG & Knowledge Graphs | RAG & Knowledge Graphs | RAG & Knowledge Graphs | RAG & Knowledge Graphs |
| Official | HKU Data Science ↗ | LlamaIndex ↗ | LangChain ↗ | deepset ↗ |
Highlighted rows are where these differ.
LightRAG
- Dual-level retrieval over a lighter graph
- Runs on CPU, which GraphRAG does not comfortably
Best for graph RAG on modest hardware.
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.
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.