LlamaIndex specializes in connecting LLMs to external data — files, databases, APIs, knowledge bases — through a comprehensive set of data loaders, indexing strategies, and query engines optimized for retrieval-augmented generation (RAG). Where LangChain is general-purpose, LlamaIndex goes deeper on the data ingestion and retrieval side, making it the preferred choice for teams building internal knowledge assistants, document Q&A systems, and multi-source research tools. It supports all major LLM providers and vector databases.

Pros

rag
data
framework

Considerations

—May require learning curve

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Pricing

Freemium