Plees Tracker is a simple sleep tracker for your Android phone.
The latest version is v7.4.1, released on 2022-09-02. See the release notes and the documentation.
This is meant to be a very simple open source clone of PrimeNap, i.e. just track sleep start/stop times and count the average / day.
Features:
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It literally does nothing while you sleep, causes no battery drain.
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Stores past sleeps, counts stat from them.
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Exports/imports sleep data to/from CSV.
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Can show past sleeps, can selectively delete individual sleeps.
It looks like this:
