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CrewAI vs Vellum

Vellum scores higher on the AgentReady, 88/100 against 79/100. They differ on 6 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

CrewAI. CrewAI is an enterprise agent build and runtime platform that enables business and technical teams to build agents while giving platform teams control to govern them.

Vellum. A personal AI assistant that lives in the secure Vellum Cloud, has its own identity, and actually does things in the world.

Where CrewAI is ahead

CrewAI passes authentication documented, and Vellum does not. That is understand, whether an agent can read the docs and work out how the API behaves before calling it.

Where Vellum is ahead

Vellum passes clear product positioning, and CrewAI does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds adopt: no mandatory sales call, agent-compatible signup flow and cli available. CrewAI misses those.

And on operate, retry behavior documented. CrewAI misses it.

What neither does

Both fail limits / constraints documented, idempotency support, rate-limit behavior predictable, agent compatibility verified. If your agent needs any of those, you will be building it yourself either way.

Score, pillar by pillar

The AgentReady splits into four pillars, scored separately, because a product can be easy to find and still impossible to adopt.

Discover. Vellum leads 100 to 87. CrewAI misses clear product positioning; Vellum misses nothing.

Understand. CrewAI leads 92 to 85. CrewAI misses limits / constraints documented; Vellum misses authentication documented, limits / constraints documented.

Adopt is whether an agent can get a key and make its first successful call without a human in the loop. Vellum leads 100 to 75. CrewAI misses no mandatory sales call, agent-compatible signup flow, cli available; Vellum misses nothing.

Operate. Vellum leads 67 to 61. CrewAI misses retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified; Vellum misses idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

CrewAI starts at $0/mo and has a free tier. Vellum starts at $30/mo and has a free tier.

Signal by signal

Which to pick

Vellum clears more of the signals an agent needs, so it is the safer default for unattended use. Full profiles: CrewAI and Vellum. Alternatives to each: CrewAI, Vellum.

An agent can fetch this as data: POST /v1/compare {"slugs": ["crewai", "vellum"]}