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Better Auth vs Logto

Logto scores higher on the AgentReady, 58/100 against 57/100. 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.

Logto. Logto is an open-source authentication and identity platform built for developers, offering auth, SSO, and RBAC for SaaS, AI agents, and B2B apps.

Where Better Auth is ahead

Better Auth passes mcp discoverable, and Logto does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds adopt: cli available and mcp integration available. Logto misses those.

Where Logto is ahead

Logto 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: agent-compatible signup flow. Better Auth misses it.

And on operate, observable execution. Better Auth misses it.

What neither does

Both fail 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, 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. Both sit at 87/100 here. Better Auth misses clear canonical domain, llms-full.txt / full agent docs; Logto misses mcp discoverable.

Understand. Both sit at 54/100 here. Better Auth misses openapi / spec quality, request examples provided, response examples provided, errors and status codes documented; Logto misses openapi / spec quality, request examples provided, response examples provided, errors and status codes documented.

Adopt. Better Auth leads 62 to 50. Better Auth misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation, fast time to first request, copyable quickstart; Logto misses no mandatory sales call, programmatic credential creation, fast time to first request, copyable quickstart, cli available, mcp integration available.

Operate is whether an agent can run against it in production and recover when a call fails. Logto 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; Logto 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. Logto starts at $0/mo and has a free tier.

Signal by signal

Which to pick

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

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