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Better Auth vs Propelauth

Propelauth scores higher on the AgentReady, 59/100 against 57/100. They differ on 6 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.

Propelauth. PropelAuth provides end-to-end managed user authentication specializing in B2B use cases, built for AI-native companies with multi-tenant auth requirements

Where Better Auth is ahead

Better Auth passes llms.txt published, and Propelauth does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: structured api reference. Propelauth misses it.

Where Propelauth is ahead

Propelauth passes agent-compatible signup flow, fast time to first request and copyable quickstart, 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: observable execution. Better Auth misses it.

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, structured, predictable output, 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. Better Auth leads 87 to 80. Better Auth misses clear canonical domain, llms-full.txt / full agent docs; Propelauth misses clear canonical domain, llms.txt published, llms-full.txt / full agent docs.

Understand. Better Auth leads 54 to 38. Better Auth misses openapi / spec quality, request examples provided, response examples provided, errors and status codes documented; Propelauth misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented.

Adopt is whether an agent can get a key and make its first successful call without a human in the loop. Propelauth leads 80 to 62. Better Auth misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation, fast time to first request, copyable quickstart; Propelauth misses no mandatory sales call, programmatic credential creation.

Operate. Propelauth leads 39 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; Propelauth misses structured, predictable output, 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. Propelauth starts at $0/month and has a free tier.

Signal by signal

Which to pick

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

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