LangChain is the framework for building LLM applications — UK developers use it to chain prompts, tools, and data together into AI agents and chatbots. It's open source (Python and JavaScript) with a commercial LangSmith platform for observability. Free for self-hosted use; LangSmith starts at $25/month. It integrates with OpenAI, Anthropic, Pinecone, and 700+ integrations. Data control depends on deployment — self-hosting keeps data in-house, aiding UK GDPR compliance. LangChain is the standard starting point for serious LLM app development.
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