head to head · open source
openGym vs fido2-net-lib
openGym has 19,145 GitHub stars, 2,540 forks, 109 open issues and last shipped yesterday. fido2-net-lib has 1,458 stars, 201 forks, 20 open issues and last shipped yesterday. openGym leads on adoption by 1,213% (19,145 vs 1,458 stars). openGym is written in JavaScript under AGPL-3.0; fido2-net-lib is written in C# under MIT. openGym has attracted 13% as many forks as stars, fido2-net-lib 14%. fido2-net-lib 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 | fido2-net-lib | |
|---|---|---|
| GitHub stars | ★ 19K | ★ 1.5K |
| License | AGPL-3.0 | MIT |
| Written in | JavaScript | C# |
| Last push | 2026-11-03 | 2026-11-03 |
| Forks | ⑂ 2.5K | ⑂ 201 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick openGym if
- You weight community size — 19K 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 fido2-net-lib if
- You want the fido2-net-lib feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C#
- You evaluated both and fido2-net-lib 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 fido2-net-lib
Passkeys FIDO2 .NET Library (WebAuthn) A fully working and battle tested library for passkeys (FIDO2 and WebAuthn) on .NET Releases & Change log 💡 Bitwarden Passwordless API The quickest way to get started with FIDO2 and WebAuthn is with the Bitwarden Passwordless API. It's free up to 10k users and a faster way to start using passkeys on your website or mobile app. Bitwarden Passwordless.dev supports .NET Framework as well as the latest .net 8+. Get started with passwordless.dev Purpose Our purpose is to enable passwordless sign in for all .NET apps (asp, core, native). To provide a developer friendly and well…
read the full fido2-net-lib overview →
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Frequently asked questions
Is openGym or fido2-net-lib more popular?
openGym has 19,145 GitHub stars and fido2-net-lib has 1,458. openGym has the larger community by that measure.
Are openGym and fido2-net-lib free?
Both are open source. openGym is licensed under AGPL-3.0 and fido2-net-lib under MIT. Neither carries a licence fee.
What is the difference between openGym and fido2-net-lib?
openGym is written in JavaScript and fido2-net-lib in C#. 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 fido2-net-lib?
Choose openGym if you want the larger community (19,145 stars) or its AGPL-3.0 licence terms. Choose fido2-net-lib if its feature set, stack or MIT licence fits better. Both are self-hostable.