Oso
Authorization and agent security platform for developers
About Oso
Oso is an authorization-as-a-service platform that helps engineering teams implement fine-grained access control without building it from scratch. It supports RBAC, ABAC, and ReBAC models through Polar, a declarative policy language, and delivers sub-10ms authorization decisions at scale. Oso also provides agent security features for monitoring and enforcing permissions on AI coding agents in real time.
Pros & Cons
Pros
- Excellent developer experience with a clean API that abstracts complex permission logic into simple calls
- Polar policy language is expressive and flexible, enabling teams to implement complex permission patterns with significantly less custom code
- High performance with sub-10ms latency and 99.99% uptime SLA, suitable for latency-sensitive production workloads
- Supports all major access control models (RBAC, ABAC, ReBAC) in one platform, avoiding vendor lock-in to a single pattern
- Teams report reducing the time to add new roles from months to days with roughly 10x faster implementation than homegrown solutions
- Trusted by engineering teams at Duolingo, Brex, Wayfair, and Webflow, demonstrating enterprise-grade reliability
Cons
- Authorization-only platform requiring a separate identity provider for authentication, adding integration complexity
- No open-source version of Oso Cloud available, which may concern teams requiring self-hosted or auditable OSS dependencies
- Polar is a proprietary DSL with a learning curve compared to using familiar programming languages
- Free tier limited to 3 seats and 1-day log retention, which may be too restrictive for small teams evaluating the platform
- Relatively small company compared to larger auth providers, which may concern risk-averse enterprise procurement teams
Key Features
Polar Policy Language
Declarative DSL for writing authorization rules as code, version-controllable and updatable independently from application logic.
Multi-Model Access Control
Native support for RBAC, ABAC, and ReBAC authorization patterns within a single unified platform.
Agent Security Monitoring
Captures every prompt, tool call, and MCP server interaction from AI coding agents with real-time alerts for PII exfiltration and suspicious activity.
Dynamic Access Enforcement
Automatically narrows agent and user permissions as risk increases during sessions, enforcing least-privilege access controls.
Multi-Tenancy Support
Built-in data and permission isolation across organizational tenants within a single application deployment.
Sub-10ms Authorization Checks
Globally distributed infrastructure delivering low-latency authorization decisions, scaling to over 1 million requests per second.
Complete Audit Trail
Maintains full activity logs of all authorization decisions and agent actions for incident response and compliance requirements.
Centralized Policy Management
Single source of truth for permissions across microservices, eliminating duplicated authorization logic and ensuring consistent enforcement.
Multi-Language SDKs
Client libraries for all major programming languages enabling consistent authorization integration across the entire tech stack.
Pricing
- Cloud deployment
- 3 seats included
- 99.5% uptime SLA
- Community Slack support
- Full audit trail of agent sessions
- 1-day log retention
- PII leakage detection
- Default alert triggers
- Cloud deployment
- Up to 30 seats
- 99.95% uptime SLA
- Private Slack support (9am-9pm ET)
- Higher rate limits
- Full audit trail of agent sessions
- 3-day log retention
- PII leakage detection
- Risky tool usage detection
- Tool inventory view
- Slack integration
- Cloud, hybrid, or on-premises deployment
- Custom number of seats
- 99.99% uptime SLA
- Private 24/7 Slack and Zoom support
- Custom rate limits and log retention
- PII and IP leakage detection
- Unlimited custom alert triggers
- Slack and SIEM integration
- SASE integration
- White-glove onboarding and training
- Custom data residency agreement
Best For
SaaS Multi-Tenant Authorization
Implement tenant-isolated permissions for B2B SaaS applications where each customer organization needs distinct roles, resources, and access policies.
AI Agent Permission Scoping
Monitor and enforce least-privilege access controls on AI coding agents, detecting PII leakage and restricting tool usage in real time.
Microservices Authorization
Centralize authorization logic across distributed microservices architectures, replacing duplicated permission checks with a single policy engine.
Compliance-Ready Access Control
Maintain complete audit trails of all authorization decisions for SOC 2, HIPAA, or other regulatory compliance requirements.
Complex Permission Hierarchies
Model relationship-based access patterns like document sharing, organizational hierarchies, and inherited permissions using ReBAC.
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