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Clerk vs Logto

Logto scores higher on the AgentReady, 58/100 against 48/100. They differ on 11 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Clerk. Clerk provides full-stack authentication and user management with products such as Organizations, Billing, and more.

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 Clerk is ahead

Clerk 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: copyable quickstart, cli available and mcp integration available. Logto misses those.

Where Logto is ahead

Logto passes search discoverable, and Clerk 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, pricing understandable and limits / constraints documented. Clerk misses those.

And on adopt, self-service signup, agent-compatible signup flow and free trial or free allowance. Clerk misses those.

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, 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. Clerk misses search discoverable; Logto misses mcp discoverable.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Logto leads 54 to 23. Clerk misses structured api reference, openapi / spec quality, pricing understandable, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; Logto misses openapi / spec quality, request examples provided, response examples provided, errors and status codes documented.

Adopt. Logto leads 50 to 48. Clerk misses self-service signup, no mandatory sales call, agent-compatible signup flow, programmatic credential creation, free trial or free allowance, fast time to first request; Logto misses no mandatory sales call, programmatic credential creation, fast time to first request, copyable quickstart, cli available, mcp integration available.

Operate. Logto leads 39 to 35. Clerk misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified; Logto misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Clerk does not publish a machine-readable starting price. 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: Clerk and Logto. Alternatives to each: Clerk, Logto.

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