head to head · open source
openGym vs webauthn4j
openGym has 20,211 GitHub stars, 2,695 forks, 109 open issues and last shipped 2 days ago. webauthn4j has 599 stars, 101 forks, 16 open issues and last shipped 7 days ago. openGym leads on adoption by 3,274% (20,211 vs 599 stars). openGym is written in JavaScript under AGPL-3.0; webauthn4j is written in Java under Apache-2.0. openGym has attracted 13% as many forks as stars, webauthn4j 17%. 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 | webauthn4j | |
|---|---|---|
| GitHub stars | ★ 20K | ★ 599 |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | JavaScript | Java |
| Last push | 2026-11-07 | 2026-11-02 |
| Forks | ⑂ 2.7K | ⑂ 101 |
| 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 webauthn4j if
- You want the webauthn4j feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Java
- You evaluated both and webauthn4j 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 webauthn4j
WebAuthn4J A portable Java library for WebAuthn(Passkeys) server side verification Conformance All mandatory test cases and optional Android Key attestation test cases of FIDO2 Test Tools provided by FIDO Alliance are passed. Supported Attestation statement format All attestation statement formats are supported. Packed attestation FIDO U2F attestation Android Key attestation Android SafetyNet attestation TPM attestation Apple Anonymous attestation None attestation Apple App Attest attestation Kotlin friendly Although WebAuthn4J is written in Java, public members are marked by NotNull or Nullable annotation to…
read the full webauthn4j overview →
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Frequently asked questions
Is openGym or webauthn4j more popular?
openGym has 20,211 GitHub stars and webauthn4j has 599. openGym has the larger community by that measure.
Are openGym and webauthn4j free?
Both are open source. openGym is licensed under AGPL-3.0 and webauthn4j under Apache-2.0. Neither carries a licence fee.
What is the difference between openGym and webauthn4j?
openGym is written in JavaScript and webauthn4j in Java. 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 webauthn4j?
Choose openGym if you want the larger community (20,211 stars) or its AGPL-3.0 licence terms. Choose webauthn4j if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.