head to head · open source
Zitadel vs openGym
Zitadel has 15,418 GitHub stars, 1,399 forks, 1,171 open issues and last shipped 2 days ago. openGym has 15,277 stars, 2,008 forks, 109 open issues and last shipped yesterday. Zitadel leads on adoption by 1% (15,418 vs 15,277 stars). Zitadel is written in Go under AGPL-3.0; openGym is written in JavaScript under AGPL-3.0. Zitadel has attracted 9% as many forks as stars, openGym 13%. openGym 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
| Zitadel | openGym | |
|---|---|---|
| GitHub stars | ★ 15K | ★ 15K |
| License | AGPL-3.0 | AGPL-3.0 |
| Written in | Go | JavaScript |
| Last push | 2026-10-23 | 2026-10-24 |
| Forks | ⑂ 1.4K | ⑂ 2.0K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Zitadel if
- You weight community size — 15K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches Go
- 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 Zitadel
The Identity Infrastructure for Developers ZITADEL is an open source identity and access management platform built for teams that need more than basic auth. Whether you're securing a SaaS product, building a B2B platform, or self hosting a production IAM stack — ZITADEL gives you everything out of the box: SSO, MFA, Passkeys, OIDC, SAML, SCIM, and a battle tested multi tenancy model. No vendor lock in. No compromise on control. Just a robust, API first identity platform you can own. 🏡 Website 💬 Chat 📋 Docs 🧑💻 Blog 📞 Contact Why ZITADEL We built ZITADEL to handle the hardest IAM challenges at scale —…
read the full Zitadel 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 Zitadel or openGym more popular?
Zitadel has 15,418 GitHub stars and openGym has 15,277. Zitadel has the larger community by that measure.
Are Zitadel and openGym free?
Both are open source. Zitadel is licensed under AGPL-3.0 and openGym under AGPL-3.0. Neither carries a licence fee.
What is the difference between Zitadel and openGym?
Zitadel is written in Go 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, Zitadel or openGym?
Choose Zitadel if you want the larger community (15,418 stars) or its AGPL-3.0 licence terms. Choose openGym if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.