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Best AI Agent Frameworks & Orchestration for startups

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Crail tracks 6 AI Agent Frameworks & Orchestration vendors that list startups as a fit. These are the 5 that rank highest once the list is weighted for startups, and each one is shown with what it costs to start and whether you can start today without a contract — the facts that decide the shortlist at this size, rather than the same summary on every page.

How this list is weighted for startups

  • 60% of the vendor's Crail agent-readiness score
  • 15 points for a published free tier
  • 15 points for being buyable self-serve, without a sales call
  • up to 10 points for a low entry price (free tier, then a cheapest paid tier under $30, then under $75)

Startups and small businesses share the price-and-self-serve weighting; midmarket and enterprise share the compliance weighting. The full rules are on the methodology page.

Best overall: LlamaIndex

1. LlamaIndex84/100 agent-readiness

Open-source data framework for LLM/agent applications, paired with LlamaCloud - a managed platform for document parsing, extraction, and indexing.

  • Free tier: yes
  • Open source: yes (51,139 GitHub stars)
  • Buy self-serve: yes
  • Cheapest paid tier: Starter at $50/month

2. LangGraph78/100 agent-readiness

Open-source low-level orchestration framework for stateful, controllable AI agents, with an optional managed deployment platform.

  • Free tier: yes
  • Open source: yes (38,200 GitHub stars)
  • Buy self-serve: yes
  • Cheapest paid tier: LangGraph Platform - Cloud (via LangSmith Plus) at $39/month

3. LangChain71/100 agent-readiness

Open-source Python/JS framework for composing LLMs, tools, and memory into applications and agents.

  • Free tier: yes
  • Open source: yes (142,700 GitHub stars)
  • Buy self-serve: yes
  • Cheapest paid tier: no price published

4. AG2 (AutoGen)67/100 agent-readiness

Community-maintained open-source multi-agent AI framework forked from Microsoft's AutoGen, for building and orchestrating cooperating AI agents.

  • Free tier: yes
  • Open source: yes (4,800 GitHub stars)
  • Buy self-serve: yes
  • Cheapest paid tier: no price published

5. CrewAI66/100 agent-readiness

Open-source Python framework for role-based, multi-agent orchestration, with a paid Enterprise/AMP platform for deployment and governance.

  • Free tier: yes
  • Open source: yes (56,200 GitHub stars)
  • Buy self-serve: yes
  • Cheapest paid tier: no price published

FAQ

How is this AI Agent Frameworks & Orchestration ranking calculated for startups?

This is not the raw agent-readiness leaderboard. Crail scores the 6 AI Agent Frameworks & Orchestration vendors it tracks that fit startups, using 60% of the vendor's Crail agent-readiness score; 15 points for a published free tier; 15 points for being buyable self-serve, without a sales call; up to 10 points for a low entry price (free tier, then a cheapest paid tier under $30, then under $75). LlamaIndex ranks first on both measures: it holds the highest raw agent-readiness score on this list (84/100) and the top score once the startups weighting is applied.

Which of these can a startup use without paying?

All 5 publish a free tier: LlamaIndex, LangGraph, LangChain, AG2 (AutoGen) and CrewAI. LlamaIndex, LangGraph, LangChain, AG2 (AutoGen) and CrewAI are open source, so they can also be self-hosted without a license fee.

Do any of them require a sales call before you can buy?

No. All 5 can be bought self-serve, without talking to sales.