--- title: "Best Authorization Tools (2026) — Compare Policy Engines — IDSync" description: "Compare fine-grained authorization platforms and policy engines (RBAC, ABAC, PBAC, ReBAC). Side-by-side features, pricing, fit, and alternatives — curated by IDSync." lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://idsync.com/" }, { "@type": "ListItem", "position": 2, "name": "Directory", "item": "https://idsync.com/directory" }, { "@type": "ListItem", "position": 3, "name": "Authorization", "item": "https://idsync.com/directory/category/authorization" } ] }, { "@context": "https://schema.org", "@type": "CollectionPage", "name": "Authorization — Vendors on IDSync", "description": "Compare fine-grained authorization platforms and policy engines (RBAC, ABAC, PBAC, ReBAC). 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They externalize RBAC, ABAC, PBAC, and ReBAC policy from application code into policy engines that are testable, auditable, and consistently enforced across services, APIs, and infrastructure." } }, { "@type": "Question", "name": "Who needs Authorization?", "acceptedAnswer": { "@type": "Answer", "text": "Engineering and platform teams whose permission logic has outgrown hard-coded role checks, or who need consistent access decisions across many services, gateways, data platforms, and AI agents." } }, { "@type": "Question", "name": "How do I choose a Authorization tool?", "acceptedAnswer": { "@type": "Answer", "text": "Compare policy language ergonomics, supported models (RBAC/ABAC/PBAC/ReBAC), decision latency, data enrichment at decision time, audit logging, and self-hosted vs managed control planes." } } ] } ] --- [![IDSync — identity software buyer platform](/assets/idsync-logo-BKS89EW4.png)](/) [Directory](/directory) [Compare](/compare) [Resources](/resources) [Browse tools](/directory)[Run Stack Finder](/stack-finder) 1. [Home](/) 2. [Directory](/directory) 3. Authorization # Authorization Fine-grained authorization and policy engines — what identities are allowed to do. 4 vendors · Last updated 4 days ago Quick answer ## What is Authorization? Short answer Authorization platforms decide what an already-authenticated identity — human, workload, or AI agent — is allowed to do. They externalize RBAC, ABAC, PBAC, and ReBAC policy from application code into policy engines that are testable, auditable, and consistently enforced across services, APIs, and infrastructure. Best for Engineering and platform teams whose permission logic has outgrown hard-coded role checks, or who need consistent access decisions across many services, gateways, data platforms, and AI agents. When to choose Compare policy language ergonomics, supported models (RBAC/ABAC/PBAC/ReBAC), decision latency, data enrichment at decision time, audit logging, and self-hosted vs managed control planes. When not to choose Skip Authorization tooling if a broader IAM platform already covers your needs and you don't have category-specific requirements. Related tools & categories [Non-Human Identity](/directory/category/non-human-identity)[AI Agent Identity](/directory/category/ai-agent-identity)[Identity Governance / IGA](/directory/category/iga)[Privileged Access Management / PAM](/directory/category/pam)[Run the IAM Stack Finder](/stack-finder)[Browse all vendors](/directory) Buyer help ### Request a vendor shortlist Tell us what you're evaluating and IDSync will identify the identity, access, and security tools that fit your use case. [Request shortlist →](/request-shortlist) ## Top vendors in Authorization ![Cerbos company logo](https://www.google.com/s2/favicons?sz=128&domain=cerbos.dev) [Cerbos](/directory/cerbos) Free tier [](https://cerbos.dev) Cerbos is an authorization management platform built around an open source policy decision point (PDP). It enforces fine-grained RBAC, ABAC, PBAC, and ReBAC policies for applications, APIs, workloads, and AI agents. [View profile →](/directory/cerbos) [Keycard](/directory/keycard) Free tier [](https://keycard.ai) Keycard is an identity and access platform purpose-built for AI agents, founded by former Snyk and Auth0 leaders (including the creator of Passport.js). It verifies agent identity, mints short-lived task-scoped tokens in place of static API keys, and enforces runtime policy with auditable logs. [View profile →](/directory/keycard) [P0 Security](/directory/p0) Enterprise quote [](https://p0.dev) P0 Security provides an authorization control plane that discovers users, service accounts, agents, and MCP servers with sensitive access, then enforces just-in-time, short-lived access and centralized policy governance across cloud providers, Kubernetes, databases, and servers. It positions itself as a cloud-native alternative to traditional PAM. [View profile →](/directory/p0) ![Permit.io company logo](https://www.google.com/s2/favicons?sz=128&domain=permit.io) [Permit.io](/directory/permit-io) Free tier [](https://permit.io) Permit.io provides authorization-as-a-service with a low-code policy management interface, RBAC/ABAC/ReBAC policy support, and a managed policy decision layer — enabling teams to ship fine-grained access control without building it from scratch. [View profile →](/directory/permit-io) ## Related categories [Non-Human Identity](/directory/category/non-human-identity)[AI Agent Identity](/directory/category/ai-agent-identity)[Identity Governance / IGA](/directory/category/iga)[Privileged Access Management / PAM](/directory/category/pam) ### Pick the right Authorization tool Tell us about your stack and we'll send a tailored vendor shortlist for Authorization. [Request vendor shortlist →](/request-shortlist)[Run Stack Finder](/stack-finder) ### Sponsor Authorization Get featured placement at the top of this category and its comparisons. Request sponsor info IDSync provides educational buyer guidance based on publicly available information, editorial review, and user-submitted data. Vendor information should be verified before purchase. [Who we are, our methodology & disclosure policy](/about). 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