Auth0 vs Firebase Auth vs Supabase Auth vs Clerk vs Keycloak: The Complete 2026 Authentication Service Comparison
Published Aug 3, 2026
The latest authentication service comparison, updated for August 2026. A usage-first breakdown of Auth0, Firebase Auth, Supabase Auth, Clerk, and Keycloak — official pricing, free-tier limits, and where each one really stands on passkeys and SSO.
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