head to head · open source
Keycloak vs os
Keycloak has 37,168 GitHub stars, 9,017 forks, 3,292 open issues and last shipped yesterday. os has 803 stars, 26 forks, 46 open issues and last shipped yesterday. Keycloak leads on adoption by 4,529% (37,168 vs 803 stars). Keycloak is written in Java under Apache-2.0; os is written in TypeScript under MIT. Keycloak has attracted 24% as many forks as stars, os 3%. os 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 | os | |
|---|---|---|
| GitHub stars | ★ 37K | ★ 803 |
| License | Apache-2.0 | MIT |
| Written in | Java | TypeScript |
| Last push | 2026-10-06 | 2026-10-06 |
| Forks | ⑂ 9.0K | ⑂ 26 |
| 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 os if
- You want the os feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and os 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 os
ibl.ai/os is an MIT licensed, self hostable open source platform for building, deploying, and managing customizable AI agents across web, desktop, mobile, and browser, aimed at organizations that want to own their code and data.
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Frequently asked questions
Is Keycloak or os more popular?
Keycloak has 37,168 GitHub stars and os has 803. Keycloak has the larger community by that measure.
Are Keycloak and os free?
Both are open source. Keycloak is licensed under Apache-2.0 and os under MIT. Neither carries a licence fee.
What is the difference between Keycloak and os?
Keycloak is written in Java and os in TypeScript. 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 os?
Choose Keycloak if you want the larger community (37,168 stars) or its Apache-2.0 licence terms. Choose os if its feature set, stack or MIT licence fits better. Both are self-hostable.