Oso

Oso is an authorization-as-a-service platform designed to solve complex, fine-grained access control problems in applications. By decoupling and centralizing authorization logic from business code, it helps development teams improve system security, maintainability, and development efficiency, especially in microservices architectures and scenarios requiring precise permission management.

The Oso Library is an open-source authorization framework for building an authorization system within a single application. Oso Cloud is a hosted authorization-as-a-service suitable for centralized enterprise-grade access control across multiple microservices and applications, providing centralized policy definition and execution.

Oso natively supports a variety of models, including role-based access control (RBAC), attribute-based access control (ABAC), and relationship-based access control (ReBAC), and can flexibly combine these models to meet complex needs such as multi-tenant and resource-level permissions.

Oso is optimized for application-layer authorization scenarios with built-in authorization primitives, and its Polar language is easier to learn, providing an out-of-the-box framework and service experience. By contrast, OPA is a general-purpose policy engine with a steeper learning curve and requires more custom integration work.

We recommend starting with a proof of concept to validate modeling capabilities and execution efficiency. Oso provides multi-language SDKs and detailed documentation, supporting incremental integration from coarse-grained control to finer-grained control, to avoid premature over-design. You can also refer to the Oso Academy for systematic technical guidance.