Pyyan / Compare / Cognee vs LlamaIndex vs Haystack
Cognee vs LlamaIndex vs Haystack
3 of 5RAG & Knowledge Graphs · verified 13 Aug 2026
| Specification | Cognee | LlamaIndex | Haystack |
|---|---|---|---|
| Summary | Graph and vector together, with a pipeline that improves itself. | The strongest option for document-centric retrieval. | A strict pipeline abstraction, built for regulated work. |
| Kind | Framework | Framework | Framework |
| Graph | Yes, core | Yes, property graph index | Via integrations |
| Language | Python | Python, TypeScript | Python |
| Licence | Apache 2.0 | MIT | Apache 2.0 |
| GitHub stars | ~7k | ~45k | ~20k |
| Category | RAG & Knowledge Graphs | RAG & Knowledge Graphs | RAG & Knowledge Graphs |
| Official | Cognee ↗ | LlamaIndex ↗ | deepset ↗ |
Highlighted rows are where these differ.
Cognee
- Many retrieval modes over one memory layer
- Re-weights the graph from feedback
Best for deep knowledge retrieval.
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.
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.