Auth0

Auth0, now part of Okta, is a cloud-based identity and access management platform that enables developers and organizations to securely authenticate and authorize users across applications, APIs, and AI agents. It provides a unified solution for handling authentication flows, including social logins, single sign-on (SSO), multi-factor authentication (MFA), and passwordless methods, while also offering advanced authorization capabilities such as role-based access control (RBAC) and fine-grained authorization (FGA). The platform scales to handle billions of authentications monthly and integrates with a wide range of technology stacks through SDKs and APIs, aiming to reduce the complexity of building and maintaining custom identity infrastructure.

The platform supports both human users and machine identities, including AI agents and MCP servers, with features like a Token Vault for managing API access on behalf of users and asynchronous authorization for RAG pipelines. Auth0 offers a customizable universal login page, user management dashboards, and automated provisioning via SCIM. It is designed for B2B, B2C, and internal tool use cases, with pre-built quickstarts and 30+ SDKs to accelerate implementation. As part of the Okta ecosystem, it benefits from the larger organization's security infrastructure, blocking over 3 billion attacks per month according to the website.

Auth0 appears to offer a free starter tier for small-scale use, with paid plans available for enterprise features such as SSO, SCIM, and dedicated support. The platform emphasizes ease of integration, claiming setup within five minutes, and provides extensibility through Actions and Forms for orchestrating user journeys. While Auth0 abstracts much of the complexity of identity management, users should be prepared for a learning curve in configuring advanced policies and handling custom authentication flows.