{
  "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 <b>framework</b> 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)",
  "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": "2026-08-18T18:45:10.648+00:00"
  },
  "corrected_at": null,
  "upstream_changed_at": null
}