agentFast vs CrewAI: What's the Difference?

Both are frameworks. They frame different layers, which is why they aren't competitors. CrewAI is an orchestration framework for role-based crews: it decides which agent does what, and how tasks hand off — how your agent thinks. agentFast is a production framework for everything above that — how your agent survives: what happens when a tool fails, when a human has to sign off, when the process dies mid-run, when someone asks what it cost. You run CrewAI through agentFast, not instead of it.

The useful test: if the question is “which agent handles this and in what order,” that's CrewAI. If it's “this run got killed halfway through a refund — what happens now,” that's agentFast. And because agentFast is deliberately agnostic about the orchestration beneath it, the same production layer runs identically whether you picked CrewAI, LangGraph, an SDK, or your own loop.

Side by side

So do you need agentFast if you have CrewAI?

Only if you'd rather not spend two to four weeks building the production layer around your crew. CrewAI gets your agents talking to each other; agentFast is what makes the result safe to put in front of customers. See how it plugs in on the CrewAI integration page, or, if you haven't picked a framework, compare LangGraph vs CrewAI vs a vanilla loop.