Keycloak 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?
Keycloak
Open-source identity and access management for modern apps
VS
ZITADEL Login UI
Customizable login UI for the ZITADEL identity platform
| Feature | Keycloak | ZITADEL Login UI |
|---|---|---|
| Category | Identity & SSO | Identity & SSO |
| License | Apache-2.0 | Apache-2.0 |
| Language | Java | TypeScript |
| Setup difficulty | Hard | Medium |
| Min. RAM | 1,024 MB | 256 MB |
| Deployment | docker, kubernetes, bare-metal | docker, source |
| GitHub stars | ★ 36,058 | ★ 113 |
| First released | 2014 | 2023 |
| Replaces | Okta, Auth0, Microsoft Entra ID | Auth0 Universal Login |
Why pick each one
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
Frequently asked questions
Is Keycloak or ZITADEL Login UI better?
Neither is universally better. Keycloak has the larger community, while ZITADEL Login UI is simpler to set up (medium difficulty). Choose based on the comparison table above and your own setup.
Are Keycloak and ZITADEL Login UI free and open-source?
Yes. Keycloak 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 Keycloak and ZITADEL Login UI with Docker?
Keycloak: yes. ZITADEL Login UI: yes.