Freemium
Added on Nov 09,2026
LangChain is an agent engineering platform and set of open-source frameworks for building, testing, deploying and monitoring AI agents. Its commercial platform, LangSmith, supports the full agent development lifecycle, while the open-source libraries let developers build agents with any model provider.
The open-source frameworks include langchain, for building agents quickly with templates and any model provider; langgraph, for production agents that need low-level control and some determinism; and deepagents, for highly autonomous, long-running agents. The site reports more than 350 million monthly open-source downloads.
For building, LangSmith Fleet lets teams create agents in natural language with or without code. For testing, LangSmith Observability and Evaluation provide step-by-step tracing of agent runs, fast trace queries, datasets built from traces and evaluations of every step.
For deployment, it offers infrastructure for long-running tasks with persistent state, more than 30 Agent Server endpoints and isolated sandboxes for running agent-generated code. For monitoring, online evaluations, dashboards and alerts track quality, cost, latency, errors and tool behaviour in production.
Key features also include Engine, an agent that detects production issues and helps find root causes, and an LLM Gateway to control model calls, spending and sensitive data. Teams can require human approval for sensitive agent actions and deploy in SaaS, bring-your-own-cloud or self-hosted environments.
Pricing: the frameworks are open source. LangSmith has a free Developer plan (1 seat, up to 5k base traces per month, then pay as you go), a Plus plan at US$39 per seat per month (up to 10k base traces per month, then pay as you go), and custom Enterprise pricing with self-hosting, SSO and support SLAs. Discounted rates are offered for eligible startups.
It is suited to AI engineers, developers and enterprises building production AI agents and LLM applications, from early prototypes to large-scale deployments.
By the PowerfulAI.tools Editorial Team · Updated 10 November 2026 · Researched with AI assistance and checked against the official LangChain website · How we review tools
Developer is $0 for one seat with 5k base traces a month; Plus costs $39 per seat per month with 10k traces, then pay as you go at $1.00 per LangChain Standard Unit. Enterprise is custom.
Pricing checked against the official LangChain website in November 2026. Prices can change, so confirm before you buy.
Engineering teams who build, test, deploy and monitor LLM agents in production.
The langchain, langgraph and deepagents frameworks are open source. The LangSmith platform has a free Developer tier and paid plans.
LangSmith Cloud runs in US or EU regions, and Enterprise customers can choose hybrid or fully self-hosted setups in their own VPC.
Yes. VC-backed startups can apply for discounted rates and up to $10,000 in credits through LangSmith for Startups.
Popular alternatives to LangChain include Pollinations, NemoClaw and Agnes AI. Compare their pricing and what each is best for below.
| Tool | Pricing | Best for |
|---|---|---|
| Pollinations | Freemium | Developers and hobby builders who want a single API for adding AI images, audio and text to their websites, bots and app... |
| NemoClaw | Free | Developers and platform teams who want to run always-on AI agents on NVIDIA hardware under policy-based security control... |
| Agnes AI | Freemium | Developers building AI-powered apps who want access to several models through one API. |
| OrcaRouter | Freemium | Developers and teams who want to balance AI quality and cost across many models. |
| DiagramGPT | Free | Developers and students who need to sketch system designs and workflows quickly by describing them in words. |
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