head to head · open source
Better Auth vs openGym
Better Auth has 30,445 GitHub stars, 3,002 forks, 723 open issues and last shipped 2 days ago. openGym has 15,277 stars, 2,008 forks, 109 open issues and last shipped yesterday. Better Auth leads on adoption by 99% (30,445 vs 15,277 stars). Better Auth is written in TypeScript under MIT; openGym is written in JavaScript under AGPL-3.0. Better Auth has attracted 10% 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
| Better Auth | openGym | |
|---|---|---|
| GitHub stars | ★ 30K | ★ 15K |
| License | MIT | AGPL-3.0 |
| Written in | TypeScript | JavaScript |
| Last push | 2026-10-23 | 2026-10-24 |
| Forks | ⑂ 3.0K | ⑂ 2.0K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Better Auth if
- You weight community size — 30K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- 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 Better Auth
Discord · Website · Issues Better Auth Better Auth is a framework agnostic authentication (and authorization) framework for TypeScript. It provides a comprehensive set of features out of the box and includes a plugin ecosystem that simplifies adding advanced functionalities with minimal code in a short amount of time. Whether you need 2FA, multi tenant support, or other complex features, it lets you focus on building your actual application instead of reinventing the wheel. Why Better Auth Authentication in the TypeScript ecosystem is a half solved problem. Other open source libraries often require a lot of…
read the full Better Auth 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 Better Auth or openGym more popular?
Better Auth has 30,445 GitHub stars and openGym has 15,277. Better Auth has the larger community by that measure.
Are Better Auth and openGym free?
Both are open source. Better Auth is licensed under MIT and openGym under AGPL-3.0. Neither carries a licence fee.
What is the difference between Better Auth and openGym?
Better Auth is written in TypeScript 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, Better Auth or openGym?
Choose Better Auth if you want the larger community (30,445 stars) or its MIT licence terms. Choose openGym if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.