The 5 best Firebase Auth alternatives in 2026

Firebase Authentication has been a popular choice for app developers due to its generous free tier, ease of integration, and strong ties with Google Cloud, making it suitable for early-stage consumer apps and mobile-first products. However, as businesses scale, they often encounter limitations such as the lack of native support for SAML SSO, SCIM provisioning, and audit logs, leading them to consider alternatives like Google Cloud Identity Platform, which brings additional costs and complexities. This has prompted many teams to reevaluate Firebase as they seek more robust B2B and enterprise features, vendor independence, and better support for relational data needs. The article reviews five prominent Firebase Auth alternatives—WorkOS, Auth0, Supabase, FusionAuth, and AWS Cognito—each offering unique features and trade-offs. WorkOS is highlighted for its enterprise-ready features like SAML, SCIM, and an admin portal, while Auth0 offers a comprehensive ecosystem with a mature feature set. Supabase appeals to those seeking an open-source, Postgres-first stack, whereas FusionAuth provides deployment flexibility for teams with specific infrastructure needs. AWS Cognito is best suited for AWS-native teams requiring tight integration with existing AWS services, despite its noted developer experience limitations.