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Editorial comparison for operators. Ratings are sample data unless verified.
| Attribute | LangChain | LlamaIndex |
|---|---|---|
| Type | tool | tool |
| Summary | Open-source LangChain framework for building LLM applications with chains, agents, and memory management. Simplifies integration of language models into production workflows. | Open-source data framework for connecting custom data sources to LLM applications. LlamaIndex simplifies RAG pipeline construction and LLM data indexing. |
| Pricing | free · See vendor site — sample data | free · See vendor site — sample data |
| Free trial | No / not listed | No / not listed |
| API | Yes | Yes |
| Open source | Yes | Yes |
| Editor rating | — | — |
| Categories | AI/ML Development, Developer Tools, Framework & Libraries | AI Infrastructure, Data & Analytics, Developer Tools |
| Key features | Chain abstraction for sequential and conditional LLM operations · Agent framework enabling models to select and execute tools dynamically · Memory management for conversation history and context persistence · RAG support with document loaders, text splitters, and vector store integrations · Multi-provider LLM support (OpenAI, Anthropic, Cohere, local models, and others—verify on vendor site for current list) | 100+ pre-built data connectors for loading from files, databases, APIs, and cloud storage · Flexible document chunking and parsing with support for multiple file formats · Multiple index types including vector, keyword, tree, and SQL indices · Query engines with automatic routing and response synthesis · Agent framework for multi-step reasoning and tool use |
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