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https://f-droid.org/packages/org.secuso.privacyfriendlyactivitytracker/
No network connection. Only has two permissions. Seems to be accurate. Minimal battery drain.
What is f-droid?
A FOSS repository for apps
Do you need to be rooted?
No, not at all. You can download directly from that link, or download F-Droid (again from that link. It's like the Play Store but without Google) which will show you many more open source apps.