Compare tools side by side · TechInTrends

AWS's open-source policy language and engine with formal verification; powers Amazon Verified Permissions.

Open Policy Agent

CNCF-graduated general-purpose policy engine (OPA) using Rego for Kubernetes, APIs, CI and IaC.

CNCF Zanzibar-inspired relationship-based (ReBAC) authorization engine created by Auth0/Okta.

Google Zanzibar-style permissions database from AuthZed for relationship-based access at scale.

Head to head

Metric	Cedar	Open Policy Agent	OpenFGA	SpiceDB
Stars	1.9k	12.4k	6.1k	7.2k
Weekly downloads	508k	n/a	n/a	n/a
Download growth	+96%	n/a	n/a	n/a
Popularity score	65/100	75/100	69/100	70/100
Forks	188	1.7k	554	439
Open issues	192	266	243	164
Last commit	5d ago	4d ago	6d ago	6d ago
Latest version	4.14.1Nov 2, 2026	n/a	n/a	n/a
License	Apache-2.0	Apache-2.0	Apache-2.0	Apache-2.0
First released	2023	2015	2022	2021
Signals	Trending (detected automatically)Rising	Popular	Rising	Rising
Listed in	Security & Identity › Authorization & policy	Security & Identity › Authorization & policy	Security & Identity › Authorization & policy	Security & Identity › Authorization & policy

Weekly downloads over time

Hover for exact values; switch to log scale for tools of very different sizes. Not shown (no comparable download data): Open Policy Agent, OpenFGA, SpiceDB.