Open Source Alternatives to Firebase Authentication

An identity solution that provides tools for building secure authentication systems and improving user onboarding. It supports multiple sign-in methods, including email and password, phone authentication, and third-party providers such as Google, Apple, X, Facebook, and GitHub. The product includes FirebaseUI, a customizable open source component that manages UI flows for signing in users on websites and mobile devices. It is designed for developers building multi-platform applications and can be integrated with under 10 lines of code. The service is deployed as part of the Firebase backend infrastructure and is compatible with iOS, Android, web, C++, and Unity platforms. It handles complex identity cases such as account merging to help teams improve app quality and user conversion rates.

Whether you want to cut software costs or escape vendor lock-in, these open source alternatives to Firebase Authentication give you an option you fully own. You can self-host them, so your data stays on infrastructure you control. This page lists 2 open source alternatives to Firebase Authentication. The most popular are SuperTokens and Authgear. Most use the Apache-2.0 license, and 2 offer an official Docker image.