LangChain
Open-source framework for composing language-model calls, tools and retrieval into applications.
Find alternatives to LangChain
The framework itself is open source; the hosted products beside it are priced on the same page.
What it does
- Agent orchestration
- Knowledge retrieval
Sources
- Pricing
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The framework itself is open source; the hosted products beside it are priced on the same page.
- Sold within
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Official documentation · 29 Sep 2026
The vendor's page states a free open-source self-serve route needing no plan; the pricing page lists it under Open Source, apart from LangSmith: "LangChain is an MIT-licensed open-source library and is free to use."
Also from LangChain
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LangGraph Developer tool
Open-source library for building agents as explicit graphs of steps and state.
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LangSmith Platform
Traces, evaluates and monitors language-model applications in development and production.
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LangSmith Context Hub Agent platform
Versions and deploys prompts and agent context. Part of the LangSmith platform (categorized under 'No-Code Agents', 'Observability', 'Evaluation' or 'Deployment infrastructure' depending on the module).
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LangSmith Deployment Agent platform
Deploys and operates production agents. Part of the LangSmith platform (categorized under 'No-Code Agents', 'Observability', 'Evaluation' or 'Deployment infrastructure' depending on the module).
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LangSmith Engine Agent platform
Analyzes agent traces and recommends fixes. Part of the LangSmith platform (categorized under 'No-Code Agents', 'Observability', 'Evaluation' or 'Deployment infrastructure' depending on the module).
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LangSmith Fleet Agent platform
No-code agent building, deployment into Slack/Teams/Gmail, and human-in-the-loop approval controls. Part of the LangSmith platform (categorized under 'No-Code Agents', 'Observability', 'Evaluation' or 'Deployment infrastructure' depending on the module).
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LangSmith LLM Gateway Agent platform
Governs model calls and spending across providers. Part of the LangSmith platform (categorized under 'No-Code Agents', 'Observability', 'Evaluation' or 'Deployment infrastructure' depending on the module).
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LangSmith Sandboxes Agent platform
Runs agent-generated code in isolated virtual machines. Part of the LangSmith platform (categorized under 'No-Code Agents', 'Observability', 'Evaluation' or 'Deployment infrastructure' depending on the module).
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