LlamaIndex
Data framework for LLMs — index, query, and retrieve from any data source.
Add LlamaIndex to your hut →LlamaIndex is a data framework for building LLM applications that reason over your own data. It specialises in the ingestion, structuring, and retrieval side of RAG — connecting data sources (PDFs, databases, APIs, wikis, Notion, Slack) to LLMs in a queryable, structured way. Where LangChain provides breadth across the full agent/chain/tool stack, LlamaIndex goes deep on the data layer: multiple index types, query engines, and retrieval strategies for complex knowledge bases.
Open-source and free. LlamaCloud offers a managed data pipeline for teams who want the retrieval infrastructure without the ops work. Most often compared to LangChain — LlamaIndex's edge is sophisticated data indexing and retrieval for complex, multi-source RAG; LangChain's is the broader agent and workflow ecosystem.
| Made by | LlamaIndex |
|---|---|
| Pricing | Open-source (free) · LlamaCloud managed service (usage-based) |
| Best for | RAG pipelines, data indexing for LLMs, multi-source knowledge bases, production retrieval |
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