What is Auth0 used for?

Auth0 is an authentication and authorization platform that lets developers add login, single sign-on and access control to apps with SDKs and quickstarts. It is a good fit for adding login to a SaaS application, B2B apps needing single sign-on and securing AI agents with identity.

Yes. Auth0 has a free plan, and paid plans start at $35 per month.

Is Auth0 open source?

No. Auth0 is proprietary (closed-source) software and can't be self-hosted. Open-source alternatives to Auth0 include Logto, Keycloak and Ory Hydra.

What are some alternatives to Auth0?

Auth0 competes with Amazon Cognito, Microsoft Entra ID and FusionAuth. For open-source options, see Enlisted's ranked list of open-source Auth0 alternatives.

Auth0: features, pricing and alternatives

About Auth0

Auth0 is a commercial identity platform for adding user authentication and authorization to applications. Rather than building login systems from scratch, developers integrate Auth0's hosted service and rely on it to handle sign-in flows, tokens and access rules.

The vendor stresses ease of implementation, scalability and adaptability, and now covers securing AI agents as well as human users. Developers get documentation, APIs, SDKs, an events catalog and code samples, with quickstarts for frameworks such as Next.js, React, Vue.js, Angular, React Native and Swift, and support for more than 30 languages and frameworks. Developer tools include a deploy CLI plus browser playgrounds for JWT decoding, WebAuthn, OIDC, SAML and passkeys.

Auth0 is hosted, proprietary software with a pricing page, and it cannot be self-hosted. It suits product teams building SaaS, B2B and consumer apps that need standards-based login, single sign-on and passkeys without maintaining identity infrastructure.

Key features

Hosted login and authentication flows
SDKs and quickstarts for many frameworks
Authorization and access control
Passkeys, WebAuthn and OIDC support
SAML single sign-on tooling
Identity features for AI agents
Deploy CLI for configuration

Good fit for

→Adding login to a SaaS application
→B2B apps needing single sign-on
→Securing AI agents with identity

Tags: authentication; authorization; sso; identity; oidc; developer-tools

Auth0: questions and answers

What is Auth0 used for?: Auth0 is an authentication and authorization platform that lets developers add login, single sign-on and access control to apps with SDKs and quickstarts. It is a good fit for adding login to a SaaS application, B2B apps needing single sign-on and securing AI agents with identity.
Is Auth0 free?: Yes. Auth0 has a free plan, and paid plans start at $35 per month.
Is Auth0 open source?: No. Auth0 is proprietary (closed-source) software and can't be self-hosted. Open-source alternatives to Auth0 include Logto, Keycloak and Ory Hydra.
What are some alternatives to Auth0?: Auth0 competes with Amazon Cognito, Microsoft Entra ID and FusionAuth. For open-source options, see Enlisted's ranked list of open-source Auth0 alternatives.