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Logto vs Propelauth

Propelauth scores higher on the AgentReady, 59/100 against 58/100. 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

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.

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 Logto is ahead

Logto passes clear canonical domain, llms.txt published and llms-full.txt / full agent docs, 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 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: fast time to first request, copyable quickstart, cli available and mcp integration available. Logto 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, 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. Logto leads 87 to 80. Logto misses mcp discoverable; Propelauth misses clear canonical domain, llms.txt published, llms-full.txt / full agent docs.

Understand. Logto leads 54 to 38. Logto 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 50. Logto misses no mandatory sales call, programmatic credential creation, fast time to first request, copyable quickstart, cli available, mcp integration available; Propelauth misses no mandatory sales call, programmatic credential creation.

Operate. Both sit at 39/100 here. Logto misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified; Propelauth misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Logto starts at $0/mo 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: Logto and Propelauth. Alternatives to each: Logto, Propelauth.

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