LangChain logo

    LangChain

    Open Source★ FEATURED
    https://langchain.com
    >> OPEN TOOL

    LangChain is an open-source framework for building applications with large language models, providing abstractions for chains, agents, memory, and tool use that simplify complex LLM application development.

    Category

    Coding

    Subcategory

    API Development

    Free Tier

    Free and open source

    Paid Plans

    LangSmith hosted platform from $39/month

    API Cost

    LLM provider costs apply

    APICLI

    LangChain Trust & Security Report

    Certifications, AI-training posture, and security controls, with sourced proof.

    VIEW
    SOC 2 Type IIGDPR (compliance posture, not a certification)HIPAA

    Verified against LangChain's own trust and security pages. See the full report for sourced proof →

    Region

    Multi-region hosting: US (GCP US, AWS US), EU (GCP EU), and APAC (GCP EU/APAC per docs), selectable per organization at signup; a single org cannot currently split workspaces across regions. Primary personal-information processing occurs in the United States per the general privacy policy; DPA available via DocuSign for customers needing one.

    Trains on Data

    No

    Self-hostable

    Yes

    Building RAG (retrieval-augmented generation) appsCreating AI agents with tool useChaining LLM calls for complex workflowsBuilding chatbots with memoryConnecting LLMs to external data sources

    // MORE IN API DEVELOPMENT

    Vercel AI SDK logoVercel AI SDK
    Open Source
    CodingAPI DevelopmentVerified
    #ai sdk#typescript
    LlamaIndex logoLlamaIndex
    Open Source
    CodingAPI DevelopmentVerified
    #llm framework#rag
    Hugging Face logoHugging Face
    Freemium
    CodingAPI DevelopmentVerified
    #model hub#open source