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Agentmail vs Loops

Agentmail scores higher on the AgentReady, 84/100 against 66/100. 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

Agentmail. AgentMail is an email inbox API for AI agents.

Loops. Loops is an email platform for building and managing lifecycle email with AI agents.

Where Agentmail is ahead

Agentmail passes structured api reference, openapi / spec quality, request examples provided, response examples provided and errors and status codes documented, and Loops does not. That is understand, whether an agent can read the docs and work out how the API behaves before calling it.

It also holds adopt: programmatic credential creation. Loops misses it.

And on operate, structured, predictable output and machine-readable errors. Loops misses those.

Where Loops is ahead

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

It also holds understand: limits / constraints documented. Agentmail misses it.

What neither does

Both fail no mandatory sales call, agent-compatible signup flow, 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. Loops leads 100 to 87. Agentmail misses search discoverable; Loops misses nothing.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Agentmail leads 92 to 38. Agentmail misses limits / constraints documented; Loops misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented.

Adopt. Agentmail leads 80 to 71. Agentmail misses no mandatory sales call, agent-compatible signup flow; Loops misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation.

Operate. Agentmail leads 76 to 53. Agentmail misses retry behavior documented, idempotency support, rate-limit behavior predictable; Loops misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable.

Pricing

Agentmail starts at $0/mo and has a free tier. Loops does not publish one and has a free tier.

Signal by signal

Which to pick

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

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