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Feature comparison of selected websites
	LangChain The framework for LLM apps.	LlamaIndex The data framework for LLM apps.	CrewAI Orchestrate role-playing AI agents.
Rating	—	—	—
Pricing	Free	Free	Free
Open source
Category	Agent Frameworks	Agent Frameworks	Agent Frameworks
Key features	Chains, agents, and tools Hundreds of integrations Python and JS	Best-in-class RAG pipelines 100+ data loaders Query engines and agents	Role-based agent crews Task delegation Standalone (no LangChain needed)
Pros	Huge ecosystem and examples Covers the whole app surface	Purpose-built for RAG Clean data abstractions	Simple multi-agent model Fast to prototype crews
Cons	Abstractions can feel heavy Fast-moving API	Narrower than LangChain outside RAG Still evolving	Younger project Complex flows need care
	Visit langchain.com	Visit llamaindex.ai	Visit crewai.com

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