LangChain offers a free tier and paid plans with higher limits or premium features.

What platforms does LangChain support?

LangChain runs on mac, win, linux, cli.

What category does LangChain belong to?

LangChain is in the AI Web Apps category — Web apps with AI baked in — built for everything from journaling to research. Submitter-shipped products live here.

AI Web Apps·Freemium

LangChain

Most-used framework for building LLM applications with retrieval, agents, and chains.

What is LangChain, in two sentences

LangChain is a most-used framework for building LLM applications with retrieval, agents, and chains.

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Concepts you should know

ReAct pattern
Reasoning + Acting — a prompting pattern from a 2022 paper where the LLM interleaves chain-of-thought with explicit tool calls. The pattern that most modern coding agents implement under the hood.

Frequently asked questions

What is LangChain?: LangChain is a most-used framework for building LLM applications with retrieval, agents, and chains.
Is LangChain free?: LangChain offers a free tier and paid plans with higher limits or premium features.
What platforms does LangChain support?: LangChain runs on mac, win, linux, cli.
What category does LangChain belong to?: LangChain is in the AI Web Apps category — Web apps with AI baked in — built for everything from journaling to research. Submitter-shipped products live here.