Looking for an open-source alternative to Firebase Authentication? Below are 5 community-built tools that offer similar functionality — all free, open source, and ready to use or self-host. Ranked by GitHub stars.
Open Source Identity and Access Management solution for modern applications and services, offering single sign-on, user federation, and multi-factor authentication.
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.
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 picks from this list are Keycloak, Lucia, OpenAuth — all maintained, free to use, and self-hostable.
Yes. Every tool listed here is open source and free to use. Many can be self-hosted on your own infrastructure, which means no subscription fees and full control over your data.
Most of the alternatives listed are self-hostable. Check each tool's page for hosting details, system requirements, and licensing terms.
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