authentik vs openGym
authentik and openGym are both identity and access software. Authentik is open source under a license set out in its repository, with 26k GitHub stars. OpenGym is open source under AGPL-3.0, with 19k GitHub stars.
Which to pick
- Pick authentik when
- You want one login for many self-hosted and SaaS apps without paying per user for Okta or Entra ID, and can run it yourself.
- Pick openGym when
- You want a free workout log you can self-host or keep on your phone, without a subscription app.
Side by side
A self-hosted identity provider for single sign-on over SAML, OAuth2 and OIDC, LDAP and RADIUS, with configurable login flows, MFA and a proxy for apps that have no SSO.
A gym and body-weight tracker for planning routines, logging workouts and seeing which muscles were trained, with imports from Strong, Hevy and FitNotes.
Some features are in the paid Enterprise tier, and its flow and stage model takes time to learn.
Only a few months old despite its star count, and AGPL licensed.
Production-ready
Experimental
Self-hosted server
Mobile app and self-hosted server
Python, Django, TypeScript, Go, Rust and PostgreSQL
JavaScript, React, Node.js and Swift
Open source, license unclear on GitHub
Open source, AGPL-3.0 (network copyleft)
GitHub could not read the license. Check it in the repository before reusing any code.
Use inside your business is unrestricted. If you change it and let customers use it over the internet, you must publish your changes.
26k GitHub stars
19k GitHub stars
Established: started 6 years ago, latest release version/2026.8.5.
New: started 3 months ago, latest release v1.4.3.
Other comparisons
More identity providers and single sign-on servers
Both sides were judged on 2026-11-06 from each project's README and GitHub data. License, age and popularity lines are worked out directly.