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Humanloop vs Vellum

Vellum scores higher on the AgentReady, 88/100 against 51/100. They differ on 14 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Humanloop. The LLM evals platform for enterprises.

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

Where Vellum is ahead

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

It also holds understand: openapi / spec quality, request examples provided, response examples provided and errors and status codes documented. Humanloop misses those.

And on adopt, self-service signup, no mandatory sales call, programmatic credential creation, fast time to first request, cli available and mcp integration available. Humanloop misses those.

Finally, on operate, structured, predictable output, machine-readable errors and retry behavior documented. Humanloop misses those.

What neither does

Both fail authentication documented, 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. Humanloop misses mcp discoverable; Vellum misses nothing.

Understand. Vellum leads 85 to 38. Humanloop misses openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, 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 43. Humanloop misses self-service signup, no mandatory sales call, programmatic credential creation, fast time to first request, cli available, mcp integration available; Vellum misses nothing.

Operate. Vellum leads 67 to 35. Humanloop misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified; Vellum misses idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Humanloop does not publish a machine-readable starting price 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: Humanloop and Vellum. Alternatives to each: Humanloop, Vellum.

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