head to head · open source
Keycloak vs Marble
Keycloak has 37,657 GitHub stars, 9,129 forks, 3,292 open issues and last shipped yesterday. Marble has 618 stars, 92 forks, 0 open issues and last shipped 12 days ago. Keycloak leads on adoption by 5,993% (37,657 vs 618 stars). Keycloak is written in Java under Apache-2.0; Marble is written in HTML under a custom or non-standard licence. Keycloak has attracted 24% as many forks as stars, Marble 15%. Keycloak was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Keycloak | Marble | |
|---|---|---|
| GitHub stars | ★ 38K | ★ 618 |
| License | Apache-2.0 | Custom / other |
| Written in | Java | HTML |
| Last push | 2026-11-02 | 2026-10-22 |
| Forks | ⑂ 9.1K | ⑂ 92 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Keycloak if
- You weight community size — 38K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Java
- You value the larger contributor base for long-term maintenance
pick Marble if
- You want the Marble feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches HTML
- You evaluated both and Marble fits your workflow better
About Keycloak
Open Source Identity and Access Management Add authentication to applications and secure services with minimum effort. No need to deal with storing users or authenticating users. Keycloak provides user federation, strong authentication, user management, fine grained authorization, and more. Help and Documentation Documentation User Mailing List Mailing list for help and general questions about Keycloak Join keycloak for general questions, or keycloak dev on Slack for design and development discussions, by creating an account at Reporting Security Vulnerabilities If you have found a security vulnerability, please…
read the full Keycloak overview →
About Marble
Marble The best of Build and Buy: keep full control and build on top. Marble is the flexible alternative to Comply Advantage, Actimize or Fiserv for Transaction Monitoring, AML Screening and Case investigation powered by AI. Our Open Source core provides the flexibility to deploy On Premise or SaaS. It is already used by 100+ fast growing fintechs, banks and top crypto exchanges in 15+ countries in the world. What I like the most about Marble is Flexibility . In other tools, you don't understand what is going on behind the scenes which ends up lacking precision and possibilities to troubleshoot your detection…
read the full Marble overview →
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Frequently asked questions
Is Keycloak or Marble more popular?
Keycloak has 37,657 GitHub stars and Marble has 618. Keycloak has the larger community by that measure.
Are Keycloak and Marble free?
Both are open source. Keycloak is licensed under Apache-2.0, and Marble has no licence declared in this registry. Both are free to self-host.
What is the difference between Keycloak and Marble?
Keycloak is written in Java and Marble in HTML. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Keycloak or Marble?
Choose Keycloak if you want the larger community (37,657 stars) or its Apache-2.0 licence terms. Choose Marble if its feature set, stack or Custom / other licence fits better. Both are self-hostable.