LangChain / LangGraph

Open-source frameworks for LLM apps and stateful agents, plus the LangSmith platform.

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Pricing

Model
freemium
Starting price
Not listed — check the vendor site

Niches

🤖 AI Agents

Best for

Build an AI agent in code

▸ Largest ecosystem; LangGraph for controllable agents.

Related use cases

Add long-term memory and knowledge to an agentBuild a full-stack web app from a promptBuild agent workflows without codingLaunch a phone/voice AI agent