Auth0
Identity platform for authentication, authorization, and user management with social login support.
Best for teams who need enterprise-grade auth with extensive protocol support (OAuth, SAML, OIDC).
Use Cases
Free Tier
7K monthly active users, unlimited logins, 2 social providers
How to Maximize the Free Tier
Auth0's free tier (7K MAU, 2 social providers) works for early-stage products with limited budget. Stick to the two most popular social providers (Google + GitHub) to avoid hitting the provider limit. The real cost is complexity, not money — Auth0's configuration surface is massive. Use their starter templates and avoid custom rules/hooks until absolutely necessary. Plan for the pricing jump at scale — Auth0 is among the most expensive auth providers at volume.
Getting Started
Sign up → create application → choose technology (React, Node, etc.) → copy domain, client ID, secret → install auth0-spa-js → configure login/logout → enable social connections in dashboard.
Pros
- Enterprise grade: Industry-standard identity platform with support for OAuth, SAML, OIDC, LDAP, and enterprise SSO
- Stack agnostic: SDKs for every major language and framework — works with anything from React to .NET to Flutter
- MAU allowance: 7,000 monthly active users on the free tier — solid for MVPs and small business applications
Cons
- Limited providers: Only 2 social login providers on the free tier — additional providers require the paid plan
- Complex configuration: The sheer number of options (rules, hooks, actions, connections) can be overwhelming for simple use cases
- Pricing escalation: Costs scale rapidly beyond the free tier — Auth0 is one of the more expensive auth providers at scale
- Aging UI: The management dashboard and hosted login pages look dated compared to Clerk's modern interface