The De Facto Framework for Building LLM Apps — Vast, Powerful, Opinionated
“LangChain is the most widely-used framework for building LLM applications — chains, agents, RAG, memory, and integrations to nearly every model and vector store.”
By AITools
· RAG pipelines, tool-using agents, multi-step LLM workflows, production LLM app scaffolding
· Free tier
✓ ProsMost complete ecosystem for LLM app building. Chains, agents, RAG, memory, and huge integration coverage. LangSmith adds tracing and evaluation. Abundant examples and community support.
✗ ConsAbstractions can feel heavy and over-engineered. API has churned across versions. Overkill for simple single-call use cases.