Logto
Open-source identity platform with sign-in experiences, user management, and social logins for web and mobile apps.
Best for developers who want generous MAU limits with the option to self-host the open-source version at scale.
Use Cases
Free Tier
50,000 MAU, social login, MFA, email/password, audit logs
How to Maximize the Free Tier
Logto's 50K MAU free tier is the most generous among major auth providers — use it freely during development without worrying about hitting limits. The audit log quota on the free plan is limited, so save logs only for critical security events. Logto's open-source core means you can self-host if you outgrow the cloud free tier, avoiding vendor lock-in. Set up social login (Google, GitHub, Apple) in the console for a frictionless sign-up flow. The MFA setup works well for apps handling sensitive data — enable it from day one.
Getting Started
Sign up at logto.io → create a new application → select framework (Next.js, React, Vue, iOS, Android) → copy the Logto endpoint and app ID → install `@logto/js` or framework-specific SDK → configure the sign-in experience in the Logto console → customize the sign-in page with your brand → test OAuth flow in development.
Pros
- Generous free tier: 50,000 MAU on the free plan is 5× Clerk and 7× Auth0 — the best value among hosted auth providers
- Open-source option: Full open-source version available for self-hosting — eliminates vendor lock-in and cost escalation at scale
- Customizable UX: Sign-in experience customization (colors, logo, layout) included on the free plan — no branding restrictions
Cons
- Smaller ecosystem: Newer and less adopted than Auth0 or Clerk — fewer integrations, SDKs, and community packages available
- Token-based pricing: Free tier uses a token system (50K tokens) that maps to MAU but can feel opaque to track actual usage
- Documentation gaps: Some advanced features (custom JWT claims, webhook configuration) have thinner docs than established competitors