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Period tracking app refuses to disclose data to American authorities
(www.newsweek.com)
This is a most excellent place for technology news and articles.
My wife uses a spreadsheet and connected it to her calendar. Seems pretty accurate.
It is a modified version of this:
http://www.alizaaufrichtig.com/period-tracker
Hmm, would there be a place for a e2e encrypted menstrual tracking app? I made such an app for tracking baby activities, menstrual calendar sounds much easier.