Best Authentication Solutions for Multi-Tenant SaaS and B2B Apps

Choosing the right authentication platform for multi-tenant SaaS and B2B applications is crucial, given the complexity of managing tenant-specific identity needs, enterprise SSO, SCIM provisioning, and role management without custom development for each new customer. The text compares eight solutions: Descope, Auth0, WorkOS, Frontegg, Ory, Keycloak, Amazon Cognito, and Firebase Authentication / Google Identity Platform, each offering different strengths and models, such as full-stack managed, enterprise feature layers, open-source self-hosted, and cloud-native options. Descope is highlighted for its workflow-driven approach, allowing teams to manage authentication, SSO, and other identity services flexibly without accumulating custom code, while platforms like Auth0 and WorkOS offer mature, enterprise-ready features with extensive support for various protocols and integrations. The decision on which platform to use should consider factors like architecture, enterprise readiness, and long-term identity strategies, ensuring scalability, security, and developer efficiency as the application grows.