aiagents.org

LangChain

An agent engineering platform designed to support the development and deployment of ai agents.

  • ai agent framework
  • Freemium

Visit site

Pricing

The libraries are open source. LangSmith has a free plan.

Overview

LangChain is a set of tools for building ai agents. You write agents with their open-source libraries. LangSmith lets you see what an agent did and test it.

You pick which model to use.

Key features

  • Open-source libraries for building agents, including LangGraph
  • LangSmith to record runs, keep datasets, and run tests
  • Hosting for agents that need to keep running
  • Dashboards and alerts after you launch
  • Limits and approvals for model spend and data

Use cases

Show all 7Show fewer

Alternatives

  • A2UIOpen protocol for agents to stream declarative UIs without executing arbitrary code.ai agent frameworkFree
  • AgentForgeOpen-source low-code Python framework for agents and YAML cognitive architectures.ai agent frameworkFree
  • AgentOpsDeveloper observability platform to trace, debug, and cost-track ai agents.AI toolFreemium
  • AgnoSelf-hosted Python agent platform with AgentOS runtime and browser control plane.ai agent frameworkFreemium
  • AiriaEnterprise AI security and governance platform for discovering and controlling agents.AI tool
  • ArizeObservability and evaluation platform for tracing, testing, and improving ai agents.AI toolFreemium

Last updated 2026-08-29