Assembly Line

openGym

Open-source gym & body-weight tracker, now in the App Store (iPhone + Apple Watch) and as an Android APK. Plan routines, log workouts, see which muscles are trained, import from Strong/Hevy/FitNotes. Self-host it or use it on the phone alone.

openGym is an open-source authentication library project on GitHub under the AGPL-3.0 license (network copyleft), with 18k stars. It is built with V8. Its last push was 2 days ago.

Stars
18k
License
AGPL-3.0
Activity
Active
Latest release
v1.4.3

Code on GitHub Website

Judgement

What it is
Complete system
What it does
A gym and body-weight tracker for planning routines, logging workouts and seeing which muscles were trained, with imports from Strong, Hevy and FitNotes.
Adopt it when
You want a free workout log you can self-host or keep on your phone, without a subscription app.
Watch out
Only a few months old despite its star count, and AGPL licensed.
Ready for
Experimental
Runs as
Mobile app and self-hosted server
Built with
JavaScript, React, Node.js and Swift
How established
New: started 3 months ago, latest release v1.4.3.
What the license allows
Use inside your business is unrestricted. If you change it and let customers use it over the internet, you must publish your changes.

Judged on 2026-11-03 from the project's README and GitHub data. The license and age lines are worked out directly.

Compare openGym

Microsoft Entra ID vs openGymopenGym vs Ping IdentityJumpCloud vs openGymAuthelia vs openGymCasdoor vs openGym

Built from

V8

Follow it down: openGym → V8 → LLVM project → runs on a microchip

How compilers were built, back to punched paper tape

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Stars, license and activity come from GitHub and refresh on a rolling hourly schedule. The project's own description is quoted as written.