{
  "slug": "langchain",
  "name": "LangChain",
  "url": "https://www.langchain.com",
  "cat": "ai",
  "group": "ai",
  "tagline": "Agent framework plus observability",
  "price": "Framework free and open source. LangSmith: Developer $0 (1 seat, 5k traces/mo), Plus $39/seat/mo (10k traces), Enterprise custom. Usage adds $1.50 per compute unit and $1.00 per storage unit.",
  "tier": "mixed",
  "pick": false,
  "what": "Two things people conflate: LangChain is the open-source agent framework for Python and JS, while LangSmith is the paid tracing, eval and deployment platform. LangGraph adds stateful, durable agent graphs. Together they cover build, observe and host.",
  "why": "The biggest integration surface in the ecosystem — vector stores, loaders, retrievers and hundreds of tools already wrapped. LangSmith tracing shows exactly which agent step burned the tokens, and its free tier is enough for solo work.",
  "warn": "Abstraction depth is the classic complaint — debugging often means reading LangChain internals. LangSmith seat pricing at $39 each adds up before you have traced much.",
  "install": "pip install langchain (or npm i langchain)",
  "format": "text",
  "category": {
    "key": "ai",
    "name": "Model APIs, routers & observability",
    "desc": "Providers, gateways, inference hosts and eval layers — constantly conflated, listed separately here.",
    "group": "ai",
    "groupName": "Put AI inside it"
  },
  "freshness": null,
  "health": {
    "ok": true,
    "status_code": 200,
    "final_url": "https://www.langchain.com/",
    "checked_at": "2026-10-02T21:00:05.888+00:00"
  },
  "corrected_at": null,
  "upstream_changed_at": null
}