Auth0 by Okta

Auth0 occupies a distinct position from its parent Okta: where Okta focuses on workforce identity, Auth0 is purpose-built for customer identity and access management (CIAM) — adding login, registration, social auth, and security features to developer-built applications.

The developer experience is Auth0's primary competitive advantage. SDKs cover every major language and framework (Node.js, Python, React, Angular, Vue, iOS, Android, .NET, Java, PHP), and the quickstart documentation is consistently rated among the best in the industry. A developer can add a production-ready login page to a new app in under 30 minutes using Auth0's hosted Universal Login, which handles session management, MFA, and social provider integration.

Auth0 supports social login from 30+ providers including Google, Facebook, Apple, Twitter, GitHub, and LinkedIn. Passwordless options include magic links, SMS OTP, and WebAuthn (biometric/hardware key). Organizations building B2B products can use Auth0 Organizations to create isolated tenant environments with per-customer SSO configuration.

The free tier allows up to 7,500 monthly active users, making it genuinely usable for early-stage startups and side projects. The Essentials plan ($23/month) removes branding restrictions. Enterprise pricing scales to support millions of MAUs with custom SLAs, private deployments, and enterprise support. Auth0 is the default choice for any team building authentication into a product rather than managing workforce access.