Value your health by keeping track on your training. It records as you go running or walking, and gives you a bike computer with a bigger screen for cycling. You can even mark interesting locations along your way with pictures. The app keeps recorded statistics in great detail for analysis.
It also has voice announcements, and supports Bluetooth LE sensors for heart rate (Polar, Wahoo Kicker/Ticker, moofit, Mi Band 3, Amazfit Neo, Garmin HRM, and more), speed and distance (running and cycling), cadence (cycling), and a power meter (cycling). It measures altitude gain/loss via the phone’s barometer sensor. You can export data without any restrictions, as tracks either as KMZ (incl. photos), KML, or GPX.
It requires no Internet access, or extra permissions, and there are no adverts nor in-app analytics. You share only the data you want others to have. It can be installed from the Google Play Store, but also from the F-Droid store, with all Google services excluded.
It is not aiming to be a direct competitor to Strava because there is no public website, and also no iOS app. Strava’s website does help create more of a social and peer pressure type motivation for many, across both Android and iOS users. But OpenTrack is focussing more on preserving privacy by not using such a service, although one can import the recording into other apps and share from there. Regarding iOS, well the app is fully open source, so maybe someone could consider compiling it for iOS if the dependencies are not an issue.