head to head · open source
openGym vs webauthn-ruby
openGym has 19,767 GitHub stars, 2,640 forks, 109 open issues and last shipped today. webauthn-ruby has 777 stars, 70 forks, 12 open issues and last shipped 14 days ago. openGym leads on adoption by 2,444% (19,767 vs 777 stars). openGym is written in JavaScript under AGPL-3.0; webauthn-ruby is written in Ruby under MIT. openGym has attracted 13% as many forks as stars, webauthn-ruby 9%. openGym was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (passkeys), so they are genuine substitutes rather than adjacent tools.
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
| openGym | webauthn-ruby | |
|---|---|---|
| GitHub stars | ★ 20K | ★ 777 |
| License | AGPL-3.0 | MIT |
| Written in | JavaScript | Ruby |
| Last push | 2026-11-06 | 2026-10-23 |
| Forks | ⑂ 2.6K | ⑂ 70 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick openGym if
- You weight community size — 20K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick webauthn-ruby if
- You want the webauthn-ruby feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Ruby
- You evaluated both and webauthn-ruby fits your workflow better
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 →
About webauthn-ruby
webauthn ruby WebAuthn ruby server library Makes your Ruby/Rails web server become a functional WebAuthn Relying Party. Takes care of the server side operations needed to register or authenticate a user's public key credential (also called a "passkey"), including the necessary cryptographic checks. Table of Contents Security Background Prerequisites Install Usage API Attestation Statement Formats Testing Your Integration Contributing License Security Please report security vulnerabilities to security@cedarcode.com. More : SECURITY Background What is WebAuthn? WebAuthn (Web Authentication) is a W3C standard for…
read the full webauthn-ruby overview →
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Frequently asked questions
Is openGym or webauthn-ruby more popular?
openGym has 19,767 GitHub stars and webauthn-ruby has 777. openGym has the larger community by that measure.
Are openGym and webauthn-ruby free?
Both are open source. openGym is licensed under AGPL-3.0 and webauthn-ruby under MIT. Neither carries a licence fee.
What is the difference between openGym and webauthn-ruby?
openGym is written in JavaScript and webauthn-ruby in Ruby. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, openGym or webauthn-ruby?
Choose openGym if you want the larger community (19,767 stars) or its AGPL-3.0 licence terms. Choose webauthn-ruby if its feature set, stack or MIT licence fits better. Both are self-hostable.