FusionAuth is an authentication and authorization platform for applications that need SSO, passwordless login, API access, and user management. It supports cloud-hosted and self-hosted deployments while keeping identity data under your control.
FusionAuth uses a freemium model: smaller deployments can start on a free plan, while larger production workloads move to paid Cloud tiers based on monthly active users and support level. Self-hosted licensing is also available for organizations that need to run the platform in their own infrastructure.
Proprietary
FusionAuth stands out for teams that want authentication without losing control over identity data. Its API-first approach and flexible deployment options make it practical for custom applications, though its ecosystem is smaller than the largest identity vendors. It is a strong fit for developers building SaaS products, internal tools, or privacy-conscious applications. Larger organizations with complex enterprise requirements may still prefer more established suites.
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