Best Authorization-as-a-Service in 2026: Permit.io, Oso, Cerbos, AuthZed, Auth0 FGA, WorkOS FGA, AWS Verified Permissions

Authorization as a service centralizes decisions about what authenticated users, services, or agents may do, separating this function from authentication and application code. The vendor-written comparison evaluates Permit.io, Oso Cloud, Cerbos, AuthZed SpiceDB, Auth0 FGA, WorkOS FGA, and AWS Verified Permissions by access model, deployment, policy language, open-source availability, and pricing approach, emphasizing that choices depend primarily on who manages policies, where authorization decisions must run, and whether access needs are role-, attribute-, or relationship-based. It presents Permit.io as a managed control plane with cloud or locally deployed PDPs, policy management interfaces, and support for RBAC, ReBAC, and edge-based ABAC; Cerbos as a self-hosted, policy-as-code PDP; AuthZed and Auth0 FGA as relationship-graph-focused options; WorkOS FGA for hierarchical resource-scoped roles; AWS Verified Permissions for AWS-native Cedar policies; and Oso Cloud for declarative logic and database filtering. The comparison also highlights operational considerations such as resilience during control-plane outages, policy and data synchronization, audit-log exports, latency, and whether applications themselves must determine fail-open or fail-closed behavior when a PDP is unavailable.

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