PermX vs Permit.io.
Permit.io is a managed IAM platform: a dashboard, a policy editor, a hosted Policy Decision Point, and an SDK that talks to it. PermX is the opposite shape — a library you own end to end, code-first, with no vendor runtime in your hot path. Here is how they compare.
Capability comparison
Ten dimensions scored head-to-head. Rows favouring PermX are bolded in the right column.
| Capability | Permit.io | PermX |
|---|---|---|
| Deployment model | Managed SaaS PDP (or self-host the OPA-based PDP in your cluster) | Library embedded in your Node.js process — no PDP, no sidecar, no network hop |
| Policy authoring | Dashboard + policy editor UI with ReBAC/RBAC/ABAC builders | Code-first with definePermissions() — typed permission objects live next to your source |
| Type safety | String-based resource/action keys in SDK calls — no compile-time validation | Literal string types inferred from definePermissions() — renames propagate at compile time |
| React / UI integration | React SDK in beta — checkPermissions hook, manual gate composition | First-class React SDK: <Can>, <CanField>, <RouteGuard>, <FeatureGate>, hooks, store (~5 KB) |
| Data sync | Your user and role data must sync to Permit via API/webhook — second source of truth | Roles and permissions live in your own database behind your own auth — one source of truth |
| Runtime dependencies | permit SDK + HTTP client; PDP binary if self-hosting OPA | Zero runtime dependencies in @permx/core |
| Pricing model | Free tier + paid tiers metered by users, tenants, and policy evaluations | MIT-licensed, free, no metering, no vendor lock-in |
| Latency | HTTP hop to PDP (managed) or localhost PDP (self-hosted) per authorize call | In-process function call — TTL-cached permissions, microsecond-grade lookups |
| Multi-tenancy | First-class — tenant objects, per-tenant policies, multi-tenant dashboard | Built-in — cache keyed by tenantId::userId, tenant-scoped data provider |
| Vendor dependency | Requires Permit account (or running their PDP binary) to authorize requests | No external service required — the engine runs wherever you run Node.js |
When to choose Permit.io
- You want a dashboard for non-engineers to edit policies without a deploy
- Your authorization model is broader than RBAC — ReBAC, ABAC, or attribute-heavy
- You need a policy editor with approval workflows, audit logs, and a policy-as-data UI
- You prefer a managed service over owning another library in your codebase
- You are in an OPA/Rego shop and want policy reuse across heterogeneous services
When to choose PermX
- Structured RBAC with scopes covers your needs — no need for a full policy language
- You want authorization decisions in the hot path without a network hop
- You want to own the data — roles, permissions, and audit live in your own database
- You need a first-class React SDK with field/route/component gates
- You cannot — or will not — add a vendor dependency to your auth path
- You want typed permission keys that refactor safely across backend and frontend
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