Auth0
Enterprise-grade auth that handles every login method — from social login to SAML SSO
Auth0 is the auth provider you pick when your app needs enterprise features — SAML SSO, LDAP, MFA policies, organization management. It supports every login method that exists and has been battle-tested by companies from startups to Fortune 500s. It is now part of Okta.
For solo founders, Auth0 is often more than you need. If you just want social login and email/password, Clerk or Supabase Auth is simpler and faster to set up. Where Auth0 earns its complexity is when you need to sell to companies that require SSO, or when compliance demands specific auth flows. Start with something simpler and migrate to Auth0 when enterprise requirements show up.
What's good
- Supports every auth method: social, email, passwordless, SAML, LDAP
- 7,000 MAU free tier is solid for early-stage products
- Battle-tested at scale — used by thousands of companies
Watch out for
- Way more complex than you need if you just want Google login
- Pricing tiers jump steeply — you can go from free to $240/mo quickly
- Documentation is extensive but can be hard to navigate
Alternatives
More in Authentication
Clerk
Drop-in auth with pre-built UI components — sign-up, sign-in, and user management in minutes
Firebase Auth
Google's authentication service with generous free limits and tight integration across the Firebase ecosystem
Lucia
Lightweight open-source auth library that gives you full control over your authentication logic