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LangChain

LangChain is a library for building apps on language models. It covers prompts, retrieval, and agents in Python and JavaScript.

Pricing

Open source

Source

Open source

Website

langchain.com

Added

15 Oct 2026

Tags

  • Python
  • JavaScript
  • RAG
Visit official site

Opens langchain.com in a new tab.

What people actually do with this tool

Public posts. The line is a short account of the source, and the link goes to that post.

  • The poster shared a video of a LangChain agent they built to chat with Hacker News.

    HN

  • The poster shared SummarizeThis, a free web app built with LangChain and ChatGPT that summarizes text, YouTube videos, PDFs, and tweet threads.

    HN

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