FusionAuth
Authentication & User Management Software
FusionAuth is a customer identity and access management platform that handles authentication and authorization for human users, services, and AI workloads. It centralizes user management—covering users, roles, relationships, and lifecycle events—so teams can avoid duplicate identity stores across applications, APIs, and services. It supports B2C, B2B, B2B2C, partner, tenant, and machine identity models.
The platform is API-first, with full API parity across identity capabilities plus SDKs, webhooks, and workflows for CI/CD integration. Features include multi-factor and passwordless authentication, passkeys, magic links, biometric authentication, social logins, single sign-on, role-based access control, session management, breached password detection, advanced threat detection, and machine-to-machine support. Deployment options include self-hosted, on-premises, hybrid, air-gapped, and FusionAuth Cloud, with isolated single-tenant infrastructure and data sovereignty controls. It is GDPR compliant and offers a HIPAA BAA for cloud customers.
FusionAuth targets engineering teams running critical systems in regulated or complex environments. It is packaged in a free Community Edition for download and testing, alongside Starter, Essentials, and Enterprise editions with varying feature, support, and availability tiers, including a 99.99% SLA option.
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