FusionAuth ranks #6 in Authentication & Identity AI search.

FusionAuth is a developer-first Customer Identity and Access Management (CIAM) platform offering authentication, authorization, and user management for applications of any scale. Founded in 2018 and headquartered in Broomfield, Colorado, it is notable as the only commercial CIAM vendor with a true hybrid deployment model — supporting self-hosted, dedicated cloud, on-premises, and air-gapped environments. Its API-first architecture supports OAuth 2.0, OIDC, SAML v2, passkeys, MFA, SSO, and social login out of the box. A free Community edition with over 13 million downloads drives developer adoption, while paid tiers — Starter, Essentials, and Enterprise — add premium features and support. The platform is trusted by 450+ organizations including PwC, Bilt Rewards, Audacy, Little Caesars, and Oppenheimer. In November 2023, FusionAuth closed a $65M growth equity round from Updata Partners, its first external funding after bootstrapping to profitability.