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Better Auth vs Stoplight

Better Auth scores higher on the AgentReady, 57/100 against 48/100. They differ on 9 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.

Stoplight. Stoplight is a collaborative platform equipping teams with tooling across the API lifecycle to help them build quality APIs efficiently.

Where Better Auth is ahead

Better Auth passes clear product positioning, llms.txt published and mcp discoverable, and Stoplight 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 and limits / constraints documented. Stoplight misses those.

And on adopt, mcp integration available. Stoplight misses it.

Where Stoplight is ahead

Stoplight passes agent-compatible signup flow, and Better Auth does not. That is adopt, whether an agent can get a key and make its first successful call without a human in the loop.

It also holds operate: structured, predictable output and observable execution. Better Auth misses those.

What neither does

Both fail clear canonical domain, llms-full.txt / full agent docs, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, no mandatory sales call, programmatic credential creation, fast time to first request, copyable quickstart, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, 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 is whether an agent can find the product at all without being told it exists. Better Auth leads 87 to 53. Better Auth misses clear canonical domain, llms-full.txt / full agent docs; Stoplight misses clear canonical domain, clear product positioning, llms.txt published, llms-full.txt / full agent docs, mcp discoverable.

Understand. Better Auth leads 54 to 38. Better Auth misses openapi / spec quality, request examples provided, response examples provided, errors and status codes documented; Stoplight misses openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Better Auth leads 62 to 55. Better Auth misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation, fast time to first request, copyable quickstart; Stoplight misses no mandatory sales call, programmatic credential creation, fast time to first request, copyable quickstart, mcp integration available.

Operate. Stoplight leads 47 to 24. Better Auth misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution, agent compatibility verified; Stoplight misses machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Better Auth starts at $0/month and has a free tier. Stoplight starts at $44/mo and has a free tier.

Signal by signal

Which to pick

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

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