Topaz: open-source authorization combining the best of OPA and Zanzibar
Cloud-native authorization for modern applications and APIs - aserto-dev/topaz
Topaz: open-source authorization combining the best of OPA and Zanzibar launched on October 24, 2022 with 132 votes, #248 of 3,153 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 3 years on.
In plain words
Topaz is an open-source authorization system that combines features from OPA and Zanzibar. It is designed for developers who need to implement access control in their applications. The tool provides a unified approach to managing permissions and policies across services, drawing on established authorization patterns to offer flexibility in how organizations define and enforce access rules.
written from the facts on this page · September 2026
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Topaz 0.30 – OSS authz service combining the best of OPA and Zanzibar2023 · aserto.com · ▲35Hey folks! As Topaz turns a year old, we just released a big update, including support for a new authorization schema language, a built-in visual console, REST APIs for the ReBAC directory, a full test harness, and many other improvements. Would love to get your feedback! Check out the blog post [0] for the complete details (including some cool screenshots), or clone / fork the repo here [1]. Many thanks! [0] https://www.aserto.com/blog/announcing-topaz-030 [1] https://github.com/aserto-dev/topaz
Permify – Open-source authorization service based on Google Zanzibar2022 · github.com · ▲122An open-source authorization as a service inspired by Google Zanzibar, designed to build and manage fine-grained and scalable authorization systems for any application. — Permify is now part of FusionAuth 🎉 - Permify/permify
Permit.io2023 · permit.io · ▲677The new Permit.io CLI brings developer-first workflows to access control. Define, test, deploy, and enforce fine-grained authorization using AI, CI/CD, GitOps, and OpenAPI — all from your terminal
Permify 1.0 – Open-source fine-grained authorization service2024 · github.com · ▲154Permify was born out of our repeated struggles with authorization. Like any other piece of software, authorization starts small but as things grow scaling it becomes a real pain and begins to hinder product development processes. Ad-hoc authorization systems scattered throughout your app’s codebase are hard to manage, reason about, and iterate on as the company grows. Also you will need to have more specific access controls as things grow. Traditional approaches like RBAC is inefficient for defining granular permissions such as resource-specific, hierarchical, or context-aware permissions.…
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