Developer-First Customer Identity and Access Management You Can Self-Host

FusionAuth is a customer identity and access management platform built for developers who need full control over how users authenticate and access their applications. It is API-first and can be deployed anywhere, including self-hosted, on-premises, air-gapped, or as a managed cloud service running on dedicated resources. This deployment flexibility appeals to teams that want to own their authentication infrastructure rather than depend entirely on a third-party identity provider.

The platform handles a broad range of authentication and authorization needs, including multi-factor and passwordless login, single sign-on, social and biometric authentication, passkeys, and role-based access control. It supports complex user models spanning B2C, B2B, B2B2C, partner networks, and machine-to-machine scenarios, and provides user registration, session management, webhooks, and advanced threat detection to secure identity flows across humans, services, and AI systems.

FusionAuth targets engineering teams and enterprises operating critical systems across industries such as healthcare, gaming, entertainment, fintech, and retail. By offering transparent pricing, extensive APIs, and the ability to deploy in any environment, it positions itself as enterprise-grade identity software that organizations can manage on their own terms while still meeting demanding security and scalability requirements.