LangChain vs LlamaIndex: licensing, GitHub activity, and what each is actually for. Neutral comparison, no paid rankings.
LangChain: Open source. 147,760 GitHub stars. Framework for developing applications powered by LLMs. Build and test RAG pipelines, agents, and chains with built-in evaluation tools.
LlamaIndex: Open source. 52,475 GitHub stars. Data framework for LLM applications. Test and evaluate RAG systems, vector stores, and knowledge graphs with comprehensive evaluation metrics.