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Resend vs SuperTokens

Resend scores higher on the AgentReady, 89/100 against 54/100. They differ on 13 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Resend. Email platform for developers to deliver transactional and marketing emails at scale.

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

Where Resend is ahead

Resend passes structured api reference, openapi / spec quality, request examples provided, response examples provided and limits / constraints 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, agent-compatible signup flow, programmatic credential creation and fast time to first request. SuperTokens misses those.

And on operate, structured, predictable output, idempotency support, observable execution and agent compatibility verified. SuperTokens misses those.

What neither does

Both fail errors and status codes documented, machine-readable errors, retry behavior documented, 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.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Resend leads 85 to 31. Resend misses errors and status codes documented; SuperTokens misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Resend leads 100 to 60. Resend misses nothing; SuperTokens misses self-service signup, agent-compatible signup flow, programmatic credential creation, fast time to first request.

Operate. Resend leads 71 to 24. Resend misses machine-readable errors, retry behavior documented, 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

Resend 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

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

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