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Apollo vs Clay

Apollo scores higher on the AgentReady, 64/100 against 47/100. They differ on 10 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Apollo. The AI sales platform for smarter, faster revenue growth.

Clay. Clay is a go-to-market data platform that provides data infrastructure, AI agents, orchestration, and execution tools for sales and marketing teams.

Where Apollo is ahead

Apollo passes clear product positioning and llms.txt published, and Clay does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: authentication documented, pricing understandable and limits / constraints documented. Clay misses those.

And on adopt, self-service signup and free trial or free allowance. Clay misses those.

Finally, on operate, agent compatibility verified. Clay misses it.

Where Clay is ahead

Clay passes no mandatory sales call and copyable quickstart, and Apollo does not. That is adopt, whether an agent can get a key and make its first successful call without a human in the loop.

What neither does

Both fail llms-full.txt / full agent docs, structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, programmatic credential creation, fast time to first request, structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable. 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. Apollo leads 93 to 73. Apollo misses llms-full.txt / full agent docs; Clay misses clear product positioning, llms.txt published, llms-full.txt / full agent docs.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Apollo leads 38 to 15. Apollo misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented; Clay misses structured api reference, openapi / spec quality, authentication documented, pricing understandable, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Apollo leads 70 to 65. Apollo misses no mandatory sales call, programmatic credential creation, fast time to first request, copyable quickstart; Clay misses self-service signup, programmatic credential creation, free trial or free allowance, fast time to first request.

Operate. Apollo leads 56 to 35. Apollo misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable; Clay misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Apollo does not publish a machine-readable starting price and has a free tier. Clay does not publish one.

Signal by signal

Which to pick

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

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