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Agentmail vs SuperTokens

Agentmail scores higher on the AgentReady, 84/100 against 54/100. 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

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

SuperTokens. Open source user authentication platform that helps developers build fast, maintain control, and reduce costs.

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 SuperTokens 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: self-service signup, programmatic credential creation and fast time to first request. SuperTokens misses those.

And on operate, structured, predictable output, machine-readable errors, observable execution and agent compatibility verified. SuperTokens misses those.

Where SuperTokens is ahead

SuperTokens 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 adopt: no mandatory sales call. Agentmail misses it.

What neither does

Both fail limits / constraints documented, 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. SuperTokens leads 100 to 87. Agentmail misses search discoverable; SuperTokens 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 31. Agentmail misses limits / constraints documented; SuperTokens misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Agentmail leads 80 to 60. Agentmail misses no mandatory sales call, agent-compatible signup flow; SuperTokens misses self-service signup, agent-compatible signup flow, programmatic credential creation, fast time to first request.

Operate. Agentmail leads 76 to 24. Agentmail misses retry behavior documented, idempotency support, rate-limit behavior predictable; SuperTokens misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution, agent compatibility verified.

Pricing

Agentmail starts at $0/mo and has a free tier. SuperTokens starts at $0.02/MAU 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 SuperTokens. Alternatives to each: Agentmail, SuperTokens.

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