Fusionauth

Customer Identity and Access Management platform providing authentication, authorization, and user management for applications. Designed for teams that treat identity as core infrastructure rather than a shared SaaS dependency. Every capability is exposed via API and built to integrate with product code, CI/CD pipelines, and workflows.

FusionAuth is used by enterprises such as DataStax and Com Laude, and ranked as a G2 CIAM Momentum Leader. Differentiates from alternatives like Auth0 and Keycloak by offering dedicated deployments with full control over hosting, upgrades, and data placement without shared-infrastructure constraints.

Core capabilities:

• Full OAuth2, OpenID Connect, and SAML v2 support as both service provider and identity provider
• Deploy anywhere: self-hosted, on-premises, hybrid, air-gapped, or managed cloud
• Lambda functions and webhooks for custom validation, MFA logic, token transformation, and event handling
• RBAC plus fine-grained authorization with users, roles, groups, applications, and entities
• Support for B2C, B2B, B2B2C, partner, tenant, and machine-to-machine identity in one system
• Passkeys, passwordless login, MFA, breached password detection, and rate limiting

Teams use FusionAuth to centralize auth across web and mobile apps, APIs, and services while meeting regulatory and data sovereignty needs. Developers integrate via REST APIs, SDKs such as the TypeScript client, and container images for Docker and Kubernetes.