There are 8 open-source alternatives to Auth0 in this directory. The most popular is Keycloak with 33.8k GitHub stars, followed by Authelia(27.5k stars). All are open source, free to use, and many can be self-hosted.
| # | Tool | Stars | Language | License |
|---|---|---|---|---|
| 1 | Keycloak Open Source Identity and Access Management solution for modern applications and services, offering single sign-on, user federation, and multi-factor authentication. | 33.8k | Java | Apache License 2.0 |
| 2 | Authelia Authelia is a Single Sign-On Multi-Factor Authentication portal for web apps, providing secure and streamlined access management. | 27.5k | Go | Apache License 2.0 |
| 3 | Zitadel ZITADEL is a modern identity infrastructure that simplifies authentication and authorization for developers, providing advanced features like multi-factor authentication and single sign-on. | 13.5k | Go | GNU Affero General Public License v3.0 |
| 4 | Lucia A user-friendly authentication library designed to be simple and clean for developers. | 10.5k | — | BSD Zero Clause License |
| 5 | OpenAuth OpenAuth is a universal, standards-based authentication provider designed to simplify secure authentication for applications. | 5.7k | TypeScript | MIT License |
| 6 | Authgear-server authgear-server is an open-source authentication server that serves as an alternative to Auth0 and Firebase Auth. It provides secure, flexible, and scalable user authentication and identity management for web and mobile applications. | 1.6k | Go | Apache License 2.0 |
| 7 | React Query Auth Easily add authentication to your React applications using React Query, providing a seamless integration for secure and efficient login flows. | 411 | TypeScript | MIT License |
| 8 | React-auth Simplify your authentication flow when working with React applications, enhancing security and user experience. | 50 | TypeScript | MIT License |
Open Source Identity and Access Management solution for modern applications and services, offering single sign-on, user federation, and multi-factor authentication.
Authelia is a Single Sign-On Multi-Factor Authentication portal for web apps, providing secure and streamlined access management.
ZITADEL is a modern identity infrastructure that simplifies authentication and authorization for developers, providing advanced features like multi-factor authentication and single sign-on.
A user-friendly authentication library designed to be simple and clean for developers.
OpenAuth is a universal, standards-based authentication provider designed to simplify secure authentication for applications.
authgear-server is an open-source authentication server that serves as an alternative to Auth0 and Firebase Auth. It provides secure, flexible, and scalable user authentication and identity management for web and mobile applications.
Easily add authentication to your React applications using React Query, providing a seamless integration for secure and efficient login flows.
Simplify your authentication flow when working with React applications, enhancing security and user experience.
The top three are Keycloak(33.8k stars), Authelia(27.5k stars), Zitadel(13.5k stars). All are open source and free to use.
Yes. Every tool listed here is open source and free to use in your own projects. Many can be self-hosted on your own infrastructure, which means no subscription fees and full control over your data.
Many of the alternatives listed are self-hostable. Each tool's page lists hosting details, system requirements, and licensing terms.
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