Look at the other comments, apparently drip should be the goto open source app.
Comment on Menstrual tracking app data is a ‘gold mine’ for advertisers that risks women’s safety – report
four@lemmy.zip 9 months agoI couldn’t find a good one, so I’m open to recommendations
enshu@lemmy.world 9 months ago
Periodical f-droid.org/…/de.arnowelzel.android.periodical/ is good.