Best Open-Source Fitness Apps 2026: 6 Options Compared
Best open-source Fitness Apps compared: FitTrackee, wger, OpenNutriTracker, Gadgetbridge and 2 more, with licenses, platforms and prices from official pages checked October 24, 2026.
•3 min read•Learning & Everyday Apps
Quick comparison
| Tool | Price | Platforms | Best for | Tested |
|---|---|---|---|---|
| FitTrackee | Free (Free self-hosted workout tracker; you run the server yourself) | Self-hosted, Web | Self-hosted activity logging | Docs only |
| wger | Free (Free open-source workout, nutrition and weight tracker; self-host or use the project's hosted site) | Web browser, Self-hosted, Android, iOS | Training plans plus nutrition | Docs only |
| OpenNutriTracker | Free (free and open source; no account, sign-in, analytics or ads); paid from $0 per free | Android, iOS | Private calorie counting | Docs only |
| Gadgetbridge | Free (Free open-source app that replaces the vendor apps of supported bands and watches, with no cloud account) | Android | Keeping band data on your phone | Docs only |
| OpenTracks | Free (Free open-source activity recorder with no account) | Android | Offline GPS tracking | Docs only |
| Liftosaur | Free (Source code is AGPL-3.0; the homepage mentions a paid Premium (subscription or lifetime) but gives no prices) | iOS, Android, Web browser | Programmed strength training | Docs only |
Independent comparison. Paid placements are labelled separately; editorial links earn no affiliate commissions. Learn more.
Good fit if
- You want a self-hosted Strava-like log (FitTrackee is the pick)
- You want training plus meal tracking in one place (wger is the pick)
- You want calorie counts without an account (OpenNutriTracker is the pick)
- You own a supported smart band (Gadgetbridge is the pick)
Not ideal if
- You cannot host, patch and back up a server yourself and want a vendor to run it
Open-source fitness apps appeal to people who do not want workout and body data sitting in a vendor cloud. They fall into three jobs: tracking workouts, logging food, and collecting data from a watch or band. FitTrackee is a self-hosted workout log for runs and rides. wger covers training plans, nutrition and weight in one web app that you can host or use on the project site. OpenNutritracker logs calories on a phone with no account, sign-in, analytics or ads. Gadgetbridge replaces the vendor app for supported bands and watches, so steps and sleep stay on your phone. OpenTracks records GPS activities offline. Liftosaur is a strength-training logger with an AGPL-3.0 codebase and an optional paid Premium. The main trade-off is polish: commercial apps have bigger exercise databases, coaching and social features, while open-source ones ask you to configure more and import data by file. Several projects have also moved from GitHub to Codeberg, so check the current repository for releases before you commit to an app and a watch model.
FitTrackee
Free AGPL-3.0 self-hosted workout tracker; you run the server yourself. Good for runs and rides without a Strava account.
Price: Free (Free self-hosted workout tracker; you run the server yourself) (FitTrackee pricing, checked 2026-10-23).
Platforms and license: Self-hosted, Web. AGPL-3.0 (open source) (license source).
Project activity: 1.2k GitHub stars · latest release v1.3.6 (Oct 11, 2026) · last commit Oct 21, 2026
Best for: Self-hosted activity logging.
wger
Free AGPL-3.0 workout, nutrition and weight tracker with a web app and a REST API. Self-host or use the project's site.
Price: Free (Free open-source workout, nutrition and weight tracker; self-host or use the project's hosted site) (wger pricing, checked 2026-10-24).
Platforms and license: Web browser, Self-hosted, Android, iOS. AGPL-3.0 (open source) (license source).
Project activity: 7.2k GitHub stars · latest release 2.7 (Sep 3, 2026) · last commit Oct 27, 2026
Best for: Training plans plus nutrition.
Worth knowing: License verified from the repository LICENSE/COPYING file on GitHub on 2026-10-24; platforms listed from project knowledge, not re-verified on the project site.
OpenNutriTracker
GPL-3.0 calorie and nutrition tracker with no account, sign-in, analytics or ads. Food data comes from public databases.
Price: Free (free and open source; no account, sign-in, analytics or ads); paid from $0 per free (OpenNutriTracker pricing, checked 2026-10-23).
Platforms and license: Android, iOS. GPL-3.0 (open source) (license source).
Project activity: 2.8k GitHub stars · latest release v2.5.0 (Oct 23, 2026) · last commit Oct 27, 2026
Best for: Private calorie counting.
Gadgetbridge
AGPL-3.0 Android app that replaces the vendor app for supported bands and watches, with no cloud account. The GitHub repo is archived; development moved to Codeberg.
Price: Free (Free open-source app that replaces the vendor apps of supported bands and watches, with no cloud account) (Gadgetbridge pricing, checked 2026-10-24).
Platforms and license: Android. AGPL-3.0 (open source) (license source).
Project activity: 4.6k GitHub stars · Archived on GitHub
Best for: Keeping band data on your phone.
Worth knowing: The GitHub repository is archived because development moved to Codeberg; the AGPL-3.0 license was read from the GitHub copy.
OpenTracks
Apache-2.0 Android recorder for GPS activities, working offline with no account. The GitHub repository is archived.
Price: Free (Free open-source activity recorder with no account) (OpenTracks pricing, checked 2026-10-24).
Platforms and license: Android. Apache-2.0 (open source) (license source).
Project activity: 1.4k GitHub stars · latest release v4.22.0 (Aug 24, 2025) · Archived on GitHub
Best for: Offline GPS tracking.
Worth knowing: The GitHub repository is archived because development moved elsewhere; the Apache-2.0 license was read from the GitHub copy.
Liftosaur
AGPL-3.0 source for a strength logger on iOS, Android and web; a paid Premium exists check the app for its price.
Price: Free (Source code is AGPL-3.0; the homepage mentions a paid Premium (subscription or lifetime) but gives no prices) (Liftosaur pricing, checked 2026-10-24).
Platforms and license: iOS, Android, Web browser. AGPL-3.0 (open source) (license source).
Project activity: 761 GitHub stars · last commit Oct 25, 2026
Best for: Programmed strength training.
Which one to pick
- You want a self-hosted Strava-like log: FitTrackee
- You want training plus meal tracking in one place: wger
- You want calorie counts without an account: OpenNutriTracker
- You own a supported smart band: Gadgetbridge
Limits of this review
Docs-only for FitTrackee, wger, OpenNutriTracker, Gadgetbridge, OpenTracks, Liftosaur: we did not install or run them, so feature claims come from vendor pages. Vendor prices and free limits change; confirm on the linked pricing page before you commit.
More in Learning & Everyday Apps
All Learning & Everyday Apps alternatives →Sources
Kevin Fan
Kevin Fan is a SaaS founder. He runs Free Instead Of, which tracks free and open-source alternatives to paid software and checks each price and free-plan limit against the vendor's own pages.
Methodology
Based on official pricing, license and product pages checked between 2026-10-23 and 2026-10-24: FitTrackee, wger, OpenNutriTracker, Gadgetbridge, OpenTracks, Liftosaur. Prices, free limits and licenses are the figures shown on those pages on those dates. No tool on this page was installed or run. No accounts were created.