Logto is an auth platform you can self-host for free or use their cloud: login, signup, SSO, MFA, and user management for SaaS apps. Drop in their SDK, get a polished login experience, manage users through their admin console, done.

It handles the stuff that's hard to build correctly: OAuth 2.0/OIDC compliance, social login (Google, GitHub, Apple), passwordless auth, MFA, organization management for B2B SaaS, and RBAC (role-based access control, controlling who can do what in your app).

MPL-2.0 license. The self-hosted version is fully featured, no artificial feature gates to push you to cloud.

The catch: auth is a 'get it wrong and you're on the news' category. Logto is well-built but younger than Auth0 or Keycloak. If you self-host, you're responsible for security patches and uptime of your auth system, and that's not something you want going down at 2am.

**Free (self-hosted):** Full platform: all auth methods, admin console, user management, RBAC, organizations, MFA. MPL-2.0 license. No feature restrictions vs cloud.

**Logto Cloud:** - Free: 50K MAU, all auth features, community support - Pro: $16/mo + $0.08/MAU beyond free tier, custom branding, webhooks, priority support - Enterprise: custom pricing, SLA, dedicated support, compliance

The cloud free tier at 50K MAU is genuinely generous. Most startups won't hit that for months or years. When you do, $16/mo + usage is reasonable.

Self-hosting cost: a $10-20/mo VPS runs Logto fine. You need Postgres. Total self-hosted cost is under $25/mo but you handle ops, backups, and security patches yourself.

Logto

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