head to head · open source
Keycloak vs openGym
Keycloak has 37,488 GitHub stars, 9,102 forks, 3,292 open issues and last shipped yesterday. openGym has 15,277 stars, 2,008 forks, 109 open issues and last shipped yesterday. Keycloak leads on adoption by 145% (37,488 vs 15,277 stars). Keycloak is written in Java under Apache-2.0; openGym is written in JavaScript under AGPL-3.0. Keycloak has attracted 24% as many forks as stars, openGym 13%. 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 | openGym | |
|---|---|---|
| GitHub stars | ★ 37K | ★ 15K |
| License | Apache-2.0 | AGPL-3.0 |
| Written in | Java | JavaScript |
| Last push | 2026-10-24 | 2026-10-24 |
| Forks | ⑂ 9.1K | ⑂ 2.0K |
| 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 openGym if
- You want the openGym feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches JavaScript
- You evaluated both and openGym 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 openGym
A self hosted gym & body weight tracker you actually own. Plan your week, run guided workouts, track every set and your body weight over time — on your phone, synced across devices, behind your own passkey login. No account on someone else's server, no subscription, no ads. Just docker compose up . Home — today's workout & weight Guided workout — animated demos & sets Stats — heatmap, charts & PRs 🌐 opengym.duarte santos.ch · 📦 Source on GitHub · 🦊 GitLab mirror Screenshots, docs and the APK download live on the site. Want to poke at it first? The in browser demo is the real app with example data — no…
read the full openGym overview →
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Frequently asked questions
Is Keycloak or openGym more popular?
Keycloak has 37,488 GitHub stars and openGym has 15,277. Keycloak has the larger community by that measure.
Are Keycloak and openGym free?
Both are open source. Keycloak is licensed under Apache-2.0 and openGym under AGPL-3.0. Neither carries a licence fee.
What is the difference between Keycloak and openGym?
Keycloak is written in Java and openGym in JavaScript. 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 openGym?
Choose Keycloak if you want the larger community (37,488 stars) or its Apache-2.0 licence terms. Choose openGym if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.