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LangChain

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Open-source framework and platform for building, debugging, and deploying LLM apps

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  • Deployment Cloud Based, Hybrid, On Premises
  • Starting price Free
  • Free trial Not offered
  • Best for Freelancers, Startups, SMEs

What is LangChain?

LangChain is an open-source framework for building applications powered by large language models, providing abstractions for prompts, tools, and agent loops that work across many model providers and vector stores. Its companion LangGraph runtime adds durable, stateful orchestration for long-running agents, while LangSmith provides tracing, debugging, and evaluation for the whole stack.

The LangChain framework itself is free. LangSmith offers a free Developer tier with 5,000 traces a month, a Plus tier at $39 per seat per month with 10,000 base traces included, and a custom-priced Enterprise tier with self-hosted or hybrid deployment, SSO, and support SLAs. Usage beyond included limits is billed per trace or compute unit.

Key Features of LangChain

LangChain lists 9 documented features, including Open-source framework for chaining LLM calls, prompts, and tools, LangGraph runtime for stateful, durable agent orchestration with persistence and LangSmith for tracing, debugging, and evaluating LLM applications. The list below covers what the product does rather than how it is marketed.

  • Open-source framework for chaining LLM calls, prompts, and tools
  • LangGraph runtime for stateful, durable agent orchestration with persistence
  • LangSmith for tracing, debugging, and evaluating LLM applications
  • Framework-agnostic tracing via Python, TypeScript, Go, and Java SDKs
  • Prompt versioning and evaluation datasets
  • One-click serverless deployment for agents
  • Integrations with hundreds of LLM providers, vector stores, and tools
  • Human-in-the-loop workflows
  • Self-hosted and hybrid deployment options for enterprise

LangChain Pricing

LangChain lists 2 plans, starting free and running to $39.

Developer

Free

per seat/month, then pay as you go

Request pricing

For solo users getting started, with 1 seat, up to 5k base traces a month and community support, after which usage is pay as you go.

Plus

$39

per seat/month, then pay as you go

Request pricing

For teams building and deploying agents, with up to 10k base traces a month. Usage beyond that is metered in LangChain Compute Units at $1.50 each and Storage Units at $1.00 each. An Enterprise tier is quoted separately.

LangChain Specifications

LangChain is available on web app. It offers an API and has a free plan.

Deployment
  • Cloud Based
  • Hybrid
  • On Premises
Billing cycle
Monthly
Desktop
  • Web App
Languages
  • English
Built for
  • Freelancers
  • Startups
  • SMEs
  • Agencies
  • Enterprises
Support
  • Email
  • Tickets
  • Training
Integrations
OpenAI, Anthropic, Google, Hugging Face, Pinecone, Chroma, and hundreds of model providers and vector stores
Public API
Yes
Free trial
No
Free plan
Yes
Runs in browser
Yes
Customisable
Yes
Website
langchain.com

LangChain Videos

LangChain Screenshots

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LangChain FAQs

The core LangChain framework is free and open source; LangSmith, the observability and evaluation platform, has a free Developer tier plus paid Plus and Enterprise tiers.

LangChain provides abstractions for building LLM applications, LangGraph is the orchestration runtime for stateful, long-running agents, and LangSmith is the platform for tracing, debugging, and evaluating them.

LangSmith's Developer tier is free with 5,000 traces per month; the Plus tier costs $39 per seat per month with 10,000 base traces included, and Enterprise is custom-priced.

Yes, the Enterprise tier offers self-hosted and hybrid deployment options along with custom SSO, RBAC, and support SLAs.

Yes, LangChain is framework-agnostic and integrates with hundreds of LLM providers, vector stores, and tools including OpenAI, Anthropic, and Google.