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Better Auth vs SuperTokens

Better Auth scores higher on the AgentReady, 57/100 against 54/100. They differ on 7 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Better Auth. A framework-agnostic, universal authentication and authorization framework for TypeScript.

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

Where Better Auth is ahead

Better Auth passes structured api reference 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. SuperTokens misses it.

Where SuperTokens is ahead

SuperTokens passes clear canonical domain and llms-full.txt / full agent docs, and Better Auth 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 and copyable quickstart. Better Auth misses those.

What neither does

Both fail openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, agent-compatible signup flow, programmatic credential creation, fast time to first request, structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution, 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. SuperTokens leads 100 to 87. Better Auth misses clear canonical domain, llms-full.txt / full agent docs; SuperTokens misses nothing.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Better Auth leads 54 to 31. Better Auth misses openapi / spec quality, request examples provided, response examples provided, 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. Better Auth leads 62 to 60. Better Auth misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation, fast time to first request, copyable quickstart; SuperTokens misses self-service signup, agent-compatible signup flow, programmatic credential creation, fast time to first request.

Operate. Both sit at 24/100 here. Better Auth misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution, agent compatibility verified; SuperTokens misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution, agent compatibility verified.

Pricing

Better Auth starts at $0/month and has a free tier. SuperTokens starts at $0.02/MAU and has a free tier.

Signal by signal

Which to pick

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

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