Styra / Open Policy Agent vs Cerbos

The honest comparison

Styra (with Open Policy Agent) and Cerbos are both policy-as-code authorization engines, distinct from the Zanzibar-style relationship engines like OpenFGA. Open Policy Agent (OPA), with Styra as its commercial control plane, is a general-purpose policy engine using the Rego language, applied across Kubernetes admission control, infrastructure, microservices, and application authorization. Cerbos is purpose-built for application authorization, with a more approachable policy model and a stateless decision API.

When Styra / OPA wins

• You want one policy engine spanning Kubernetes, infrastructure, and application layers
• Rego's expressiveness and the CNCF-graduated OPA ecosystem matter
• You need a commercial control plane (Styra DAS) for policy management at scale
• Platform and security teams are standardizing policy-as-code broadly

When Cerbos wins

• Your need is specifically application authorization, not infra-wide policy
• A simpler, more readable policy model lowers the barrier for product teams
• Stateless, context-driven (attribute-based) decisions fit your model
• You want fast adoption without learning Rego

Pricing

OPA is open source and free; Styra DAS adds commercial management and is quote-based. Cerbos has a free open-source core with Cerbos Hub as a managed and enterprise offering.

Verdict

Choose Styra / OPA when you want a general-purpose policy engine across infrastructure and applications and value the OPA ecosystem. Choose Cerbos when application authorization is the focused need and a friendlier policy model speeds adoption. For relationship-based access instead of policy-as-code, see OpenFGA vs Cerbos and OpenFGA vs AuthZed vs Cerbos, plus the authorization guide.