SHSelfHostIndex

Open Policy Agent vs ZITADEL Login UI

A side-by-side comparison of two self-hosted identity & sso options — licensing, setup difficulty, resource needs, and what each one replaces.

Not the right match-up?
OP Open Policy Agent General-purpose policy engine for cloud-native stacks VS ZI ZITADEL Login UI Customizable login UI for the ZITADEL identity platform
FeatureOpen Policy AgentZITADEL Login UI
CategoryIdentity & SSOIdentity & SSO
LicenseApache-2.0Apache-2.0
LanguageGoTypeScript
Setup difficultyMediumMedium
Min. RAM256 MB256 MB
Deploymentdocker, kubernetes, binarydocker, source
GitHub stars★ 12,086★ 113
First released20162023
ReplacesAWS IAM policiesAuth0 Universal Login

Why pick each one

Choose Open Policy Agent if…

  • Released under the Apache-2.0 license
  • First-class Docker support for quick deployment
  • Kubernetes-ready with Helm charts available
  • Mature project with 12.1k GitHub stars
Open Policy Agent details

Choose ZITADEL Login UI if…

  • Released under the Apache-2.0 license
  • First-class Docker support for quick deployment
  • Written in TypeScript
  • Tiny footprint — runs in 256 MB RAM
ZITADEL Login UI details

Frequently asked questions

Is Open Policy Agent or ZITADEL Login UI better?

Neither is universally better. Open Policy Agent has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.

Are Open Policy Agent and ZITADEL Login UI free and open-source?

Yes. Open Policy Agent is licensed under Apache-2.0 and ZITADEL Login UI under Apache-2.0. Both can be self-hosted at no software cost.

Can I run Open Policy Agent and ZITADEL Login UI with Docker?

Open Policy Agent: yes. ZITADEL Login UI: yes.

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