FusionAuth is a complete, developer-first identity platform you can self-host on any infrastructure — on-prem, private cloud, AWS, GCP, Azure, Kubernetes, ARM, or bare metal. It handles the full identity stack: login, registration, SSO (OAuth2, OIDC, SAML), MFA, passwordless, social login, user management, multi-tenancy, and fine-grained authorization. Unlike Auth0 or Okta, FusionAuth gives you complete control over your data, no rate limits, no per-MAU pricing surprises, and a single-tenant architecture by default. The Community edition is free to self-host with no user caps — making it a serious alternative for teams that want to own their auth layer instead of renting it. Built for developers, with a clean API-first design, Terraform provider, Docker/Kubernetes deployment, and documentation that engineers actually like reading. Used by companies across FinTech, Healthcare, SaaS, and gaming to secure billions of logins.
