Open-source fitness trackers

4 fitness trackers whose code is public under an OSI-approved license, rated for privacy with evidence. Picks first, then by score.

1. FitoTrack Grade B

   Open source Android app for recording and viewing workouts such as running, cycling and hiking, with maps, charts and statistics stored on the device.

   GPL-3.0. Source code

2. FitTrackee Grade B

   Self-hosted open source web application for tracking outdoor workouts from GPS files or manual entries, with maps and statistics.

   AGPL-3.0. Source code

3. OpenTracks Grade B

   Open source Android sport tracker that records runs, rides and hikes with GPS and Bluetooth sensors, with no analytics and no cloud account.

   Apache-2.0. Source code

4. wger Grade B

   Open source workout and nutrition manager for planning routines, logging workouts, weight and meals, available as a self-hosted server, a free public instance at wger.de and mobile apps.

   AGPL-3.0 for the server and the mobile app. Source code

Compare all 6 fitness trackers, open source or not.