head to head · open source
Keycloak vs Marble
Keycloak has 36,832 GitHub stars, 8,941 forks, 3,292 open issues and last shipped yesterday. Marble has 601 stars, 86 forks, 0 open issues and last shipped 11 days ago. Keycloak leads on adoption by 6,028% (36,832 vs 601 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 14%. 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 | ★ 37K | ★ 601 |
| License | Apache-2.0 | Custom / other |
| Written in | Java | HTML |
| Last push | 2026-09-17 | 2026-09-07 |
| Forks | ⑂ 8.9K | ⑂ 86 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Keycloak if
- You weight community size — 37K 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
Keycloak is an open source identity and access management server, written in Java and licensed under Apache 2.0, that adds authentication and access control to applications and services, and it is intended for teams and organisations that want to own their user store rather than rent one.
read the full Keycloak overview →
About Marble
Marble is an open source, real time decision engine for fraud detection and AML compliance that fintechs, banks and crypto exchanges self host or run as SaaS to handle transaction monitoring, screening and case investigation.
read the full Marble overview →
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Frequently asked questions
Is Keycloak or Marble more popular?
Keycloak has 36,832 GitHub stars and Marble has 601. 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 (36,832 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.