FusionAuth
An identity platform with APIs for login and user management.
What it does
An identity platform with APIs for login and user management.
When it fits
Applications that need control over identity deployment and configuration.
Other options in this category
- Auth.js — Adding provider-based sign-in and session handling to a web application.
- Auth0 — Supporting multiple sign-in providers across web and mobile applications.
- Better Auth — Implementing accounts and sessions with an extensible application-owned auth layer.
- Clerk — Adding account screens and session handling to a React application.
- IntegrationOS AuthKit — Building an account-connection flow for third-party services.
Source
Project source for FusionAuth ↗
Editorial overview reviewed on October 24, 2026. Follow the source for current setup, compatibility, and licensing.