Agent Frameworks

6 tools, with pricing and what each is best for.

LangGraph

Agent Frameworksfree

Framework from LangChain for building stateful, multi-step agent graphs.

Best for: Controllable production agents

CrewAI

Agent Frameworksfreemium

Open-source multi-agent framework plus a paid hosted platform.

Best for: Multi-agent teams quickly

OpenAI Agents SDK

Agent Frameworksfree

Lightweight SDK for building agents with tools, handoffs and guardrails.

Best for: Agents on OpenAI models

Mastra

Agent Frameworksfree

TypeScript framework for AI agents, workflows and RAG.

Best for: JS/TS developers building agents

Vercel AI SDK

Agent Frameworksfree

TypeScript toolkit for building AI apps and agents across model providers.

Best for: AI features in Next.js/React apps

Agent-Native

Agent Frameworksfree

Builder.io's open-source TypeScript framework for agentic apps where agent and UI share actions, data and state.

Best for: Building agentic apps with a real UI