Auth0 is a comprehensive identity platform now part of Okta, handling authentication complexity so developers focus on core products.
Supports every auth method: social login with 30+ providers, passwordless, MFA, SAML/OIDC federation, M2M tokens. Actions provide serverless extensibility in the auth flow.
SDKs cover React, Angular, Vue, iOS, Android, Python, Java, .NET, Go, and more. Free tier at 25K MAU, paid plans scale with enterprise features.