FusionAuth

FusionAuth builds a customer identity and access management (CIAM) platform that organisations deploy and control themselves. The platform is offered through a hybrid model - downloaded and self-hosted, or run as a dedicated cloud instance - on single-tenant architecture, giving customers ownership of their identity stack and data sovereignty without vendor lock-in. It is used by more than 7,000 organisations, including firms in fintech, healthcare and other high-compliance industries that require isolated deployment.

The FusionAuth CIAM Platform covers password and social login, single sign-on, multi-factor authentication, passkey and biometric passwordless authentication, machine-to-machine authentication, breached password detection, advanced threat detection and user management. Developers are provided with ready-to-go APIs, SDKs in more than ten languages and quickstarts for major frameworks; a typical deployment is up and running in under five minutes.

The company describes itself as developer-first and emphasises customer ownership of data and infrastructure. FusionAuth has been recognised on the Inc. 5000 list of the fastest-growing private companies in America.