The fitness apps looked exactly like what I need, but when going to the play store says they were made for an older version of Android. Visiting Github seems like they aren't actively maintained either.
Fork them, I guess. That remains the main big advantage of open source.
I've had closed source apps, even paid ones, disappear without a trace from my phone and tablets, presumably after an OS update. I find that an incredibly shitty thing to be subjected to. If an OS update is going break any apps, I'd like to be warned about that.
Summary: All Privacy Friendly Apps:
- are Open Source (GPLv3) and their source code can be viewed an Github by anybody
- used minimal permissions
- do not neither tracking mechanisms nor advertisement
https://secuso.aifb.kit.edu/english/105.php